feat: add collections management and study coach features

- Implemented collection repository with CRUD operations for user collections.
- Created routes for managing collections, including listing, creating, updating, and deleting collections.
- Added sharing functionality for exams, allowing users to share and clone exams.
- Developed a study coach service that analyzes exam results and provides study tips based on weak areas.
- Introduced frontend components for managing collections, sharing exams, and displaying study coach insights.
- Enhanced user experience with loading states and error handling in shared components.

backend/src/db/migrations.ts

@@ -53,6 +53,19 @@ export function runMigrations(db: Database.Database): void {
     CREATE INDEX IF NOT EXISTS idx_exam_results_user ON exam_results(user_id);
   `);
 
+  // ── Add share_token and is_public columns if missing ──
+  const examCols = db.prepare(`PRAGMA table_info(saved_exams)`).all() as { name: string }[];
+  if (!examCols.some((c) => c.name === 'share_token')) {
+    db.exec(`ALTER TABLE saved_exams ADD COLUMN share_token TEXT`);
+  }
+  if (!examCols.some((c) => c.name === 'is_public')) {
+    db.exec(`ALTER TABLE saved_exams ADD COLUMN is_public INTEGER DEFAULT 0`);
+  }
+
+  db.exec(`
+    CREATE UNIQUE INDEX IF NOT EXISTS idx_saved_exams_share ON saved_exams(share_token);
+  `);
+
   // ── Add role column if missing (existing databases) ──
   const cols = db.prepare(`PRAGMA table_info(users)`).all() as {
     name: string;
@@ -61,15 +74,53 @@ export function runMigrations(db: Database.Database): void {
     db.exec(`ALTER TABLE users ADD COLUMN role TEXT NOT NULL DEFAULT 'user'`);
   }
 
-  // ── Add storage_quota_bytes if missing ──
-  if (!cols.some((c) => c.name === "storage_quota_bytes")) {
-    db.exec(`ALTER TABLE users ADD COLUMN storage_quota_bytes INTEGER NOT NULL DEFAULT 1073741824`);
-  }
+    // ── Add storage_quota_bytes if missing ──
+    if (!cols.some((c) => c.name === "storage_quota_bytes")) {
+      db.exec(`ALTER TABLE users ADD COLUMN storage_quota_bytes INTEGER NOT NULL DEFAULT 1073741824`);
+    }
 
-  // ── Add plan if missing ──
-  if (!cols.some((c) => c.name === "plan")) {
-    db.exec(`ALTER TABLE users ADD COLUMN plan TEXT NOT NULL DEFAULT 'free'`);
-  }
+    // ── Add plan if missing ──
+    if (!cols.some((c) => c.name === "plan")) {
+      db.exec(`ALTER TABLE users ADD COLUMN plan TEXT NOT NULL DEFAULT 'free'`);
+    }
+
+    // ── Add is_favorite to saved_exams if missing ──
+    const examSavedCols = db.prepare(`PRAGMA table_info(saved_exams)`).all() as { name: string }[];
+    if (!examSavedCols.some((c) => c.name === 'is_favorite')) {
+      db.exec(`ALTER TABLE saved_exams ADD COLUMN is_favorite INTEGER DEFAULT 0`);
+    }
+
+    // ── Add tags to saved_exams if missing ──
+    if (!examSavedCols.some((c) => c.name === 'tags')) {
+      db.exec(`ALTER TABLE saved_exams ADD COLUMN tags TEXT DEFAULT '[]'`);
+    }
+
+    // ── Add collection_id to saved_exams if missing ──
+    if (!examSavedCols.some((c) => c.name === 'collection_id')) {
+      db.exec(`ALTER TABLE saved_exams ADD COLUMN collection_id INTEGER REFERENCES collections(id) ON DELETE SET NULL`);
+    }
+
+    // ── Add share_mode to saved_exams if missing ──
+    if (!examSavedCols.some((c) => c.name === 'share_mode')) {
+      db.exec(`ALTER TABLE saved_exams ADD COLUMN share_mode TEXT DEFAULT 'clone'`);
+    }
+
+    // ── Add cloned_from_share_token to saved_exams if missing ──
+    if (!examSavedCols.some((c) => c.name === 'cloned_from_share_token')) {
+      db.exec(`ALTER TABLE saved_exams ADD COLUMN cloned_from_share_token TEXT`);
+    }
+
+    // ── Collections table ──
+    db.exec(`
+      CREATE TABLE IF NOT EXISTS collections (
+        id          INTEGER PRIMARY KEY AUTOINCREMENT,
+        user_id     INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+        name        TEXT NOT NULL,
+        created_at  INTEGER DEFAULT (unixepoch()),
+        updated_at  INTEGER DEFAULT (unixepoch())
+      );
+      CREATE INDEX IF NOT EXISTS idx_collections_user ON collections(user_id);
+    `);
 
   // ── Promote first user to admin if no admins exist ──
   const adminCount = db

backend/src/index.ts

@@ -10,6 +10,8 @@ import resultRoutes from './routes/results.js'
 import adminRoutes from './routes/admin.js'
 import setupRoutes from './routes/setup.js'
 import gradeRoutes from './routes/grade.js'
+import shareRoutes from './routes/share.js'
+import collectionRoutes from './routes/collections.js'
 import { errorHandler } from './middleware/error.js'
 import { config } from './config.js'
 import path from 'path'
@@ -63,6 +65,8 @@ app.use('/api/exams', examRoutes)
 app.use('/api/results', resultRoutes)
 app.use('/api/grade', gradeRoutes)
 app.use('/api/admin', adminRoutes)
+app.use('/api/share', shareRoutes)
+app.use('/api/collections', collectionRoutes)
 
 // Health check with subsystem status
 app.get('/api/health', (_req, res) => {

backend/src/repositories/collectionRepo.ts

@@ -0,0 +1,55 @@
+import { getDb } from '../db/database.js'
+
+export interface DbCollection {
+  id: number
+  user_id: number
+  name: string
+  created_at: number
+  updated_at: number
+}
+
+export interface CollectionWithCount extends DbCollection {
+  exam_count: number
+}
+
+export function createCollection(userId: number, name: string): { id: number } {
+  const db = getDb()
+  const result = db.prepare(`
+    INSERT INTO collections (user_id, name)
+    VALUES (?, ?)
+  `).run(userId, name)
+  return { id: result.lastInsertRowid as number }
+}
+
+export function getCollectionById(id: number, userId: number): DbCollection | undefined {
+  const db = getDb()
+  return db.prepare('SELECT * FROM collections WHERE id = ? AND user_id = ?').get(id, userId) as DbCollection | undefined
+}
+
+export function listCollectionsByUser(userId: number): CollectionWithCount[] {
+  const db = getDb()
+  return db.prepare(`
+    SELECT c.*, COUNT(se.id) AS exam_count
+    FROM collections c
+    LEFT JOIN saved_exams se ON se.collection_id = c.id
+    WHERE c.user_id = ?
+    GROUP BY c.id
+    ORDER BY c.updated_at DESC
+  `).all(userId) as CollectionWithCount[]
+}
+
+export function updateCollection(id: number, userId: number, name: string): boolean {
+  const db = getDb()
+  const result = db.prepare(`
+    UPDATE collections
+    SET name = ?, updated_at = unixepoch()
+    WHERE id = ? AND user_id = ?
+  `).run(name, id, userId)
+  return result.changes > 0
+}
+
+export function deleteCollection(id: number, userId: number): boolean {
+  const db = getDb()
+  const result = db.prepare('DELETE FROM collections WHERE id = ? AND user_id = ?').run(id, userId)
+  return result.changes > 0
+}

backend/src/repositories/examRepo.ts

@@ -8,6 +8,12 @@ export interface DbExam {
   exam_json: string
   created_at: number
   updated_at: number
+  share_token: string | null
+  is_public: number
+  is_favorite: number
+  tags: string | null
+  share_mode: string | null
+  cloned_from_share_token: string | null
 }
 
 export interface ExamListItem {
@@ -17,14 +23,18 @@ export interface ExamListItem {
   created_at: number
   updated_at: number
   question_count: number
+  share_token: string | null
+  is_favorite: number
+  tags: string
+  collection_id: number | null
 }
 
-export function createExam(userId: number, title: string, subtitle: string | null, examJson: string): { id: number } {
+export function createExam(userId: number, title: string, subtitle: string | null, examJson: string, tagsJson: string = '[]'): { id: number } {
   const db = getDb()
   const result = db.prepare(`
-    INSERT INTO saved_exams (user_id, title, subtitle, exam_json)
-    VALUES (?, ?, ?, ?)
-  `).run(userId, title, subtitle, examJson)
+    INSERT INTO saved_exams (user_id, title, subtitle, exam_json, tags)
+    VALUES (?, ?, ?, ?, ?)
+  `).run(userId, title, subtitle, examJson, tagsJson)
   return { id: result.lastInsertRowid as number }
 }
 
@@ -36,16 +46,24 @@ export function getExamById(id: number, userId: number): DbExam | undefined {
 export function listExamsByUser(userId: number): ExamListItem[] {
   const db = getDb()
   return db.prepare(`
-    SELECT id, title, subtitle, created_at, updated_at,
+    SELECT id, title, subtitle, created_at, updated_at, share_token, is_favorite, tags, collection_id,
            json_array_length(json_extract(exam_json, '$.questions')) AS question_count
     FROM saved_exams
     WHERE user_id = ?
-    ORDER BY updated_at DESC
+    ORDER BY is_favorite DESC, updated_at DESC
   `).all(userId) as ExamListItem[]
 }
 
-export function updateExam(id: number, userId: number, title: string, subtitle: string | null, examJson: string): boolean {
+export function updateExam(id: number, userId: number, title: string, subtitle: string | null, examJson: string, tagsJson: string | null = null): boolean {
   const db = getDb()
+  if (tagsJson !== null) {
+    const result = db.prepare(`
+      UPDATE saved_exams
+      SET title = ?, subtitle = ?, exam_json = ?, tags = ?, updated_at = unixepoch()
+      WHERE id = ? AND user_id = ?
+    `).run(title, subtitle, examJson, tagsJson, id, userId)
+    return result.changes > 0
+  }
   const result = db.prepare(`
     UPDATE saved_exams
     SET title = ?, subtitle = ?, exam_json = ?, updated_at = unixepoch()
@@ -65,3 +83,106 @@ export function countExams(): number {
   const row = db.prepare('SELECT COUNT(*) AS cnt FROM saved_exams').get() as { cnt: number }
   return row.cnt
 }
+
+export function setShareToken(id: number, userId: number, token: string, mode: string = 'clone'): boolean {
+  const db = getDb()
+  const result = db.prepare(`
+    UPDATE saved_exams
+    SET share_token = ?, is_public = 1, share_mode = ?, updated_at = unixepoch()
+    WHERE id = ? AND user_id = ?
+  `).run(token, mode, id, userId)
+  return result.changes > 0
+}
+
+export function clearShareToken(id: number, userId: number): boolean {
+  const db = getDb()
+  const result = db.prepare(`
+    UPDATE saved_exams
+    SET share_token = NULL, is_public = 0, share_mode = 'clone', updated_at = unixepoch()
+    WHERE id = ? AND user_id = ?
+  `).run(id, userId)
+  return result.changes > 0
+}
+
+export function getExamByShareToken(token: string): DbExam | undefined {
+  const db = getDb()
+  return db.prepare('SELECT * FROM saved_exams WHERE share_token = ? AND is_public = 1').get(token) as DbExam | undefined
+}
+
+export function setShareMode(id: number, userId: number, mode: string): boolean {
+  const db = getDb()
+  const result = db.prepare(`
+    UPDATE saved_exams
+    SET share_mode = ?, updated_at = unixepoch()
+    WHERE id = ? AND user_id = ?
+  `).run(mode, id, userId)
+  return result.changes > 0
+}
+
+export function cloneExam(userId: number, sourceExam: DbExam, shareToken: string): { id: number } {
+  const db = getDb()
+  const parsed = JSON.parse(sourceExam.exam_json)
+  parsed.id = undefined
+  const result = db.prepare(`
+    INSERT INTO saved_exams (user_id, title, subtitle, exam_json, cloned_from_share_token)
+    VALUES (?, ?, ?, ?, ?)
+  `).run(userId, sourceExam.title + ' (copy)', sourceExam.subtitle, JSON.stringify(parsed), shareToken)
+  return { id: result.lastInsertRowid as number }
+}
+
+export interface ClonedExamItem {
+  id: number
+  title: string
+  subtitle: string | null
+  created_at: number
+  updated_at: number
+  question_count: number
+  cloned_from_share_token: string
+}
+
+export function listClonedExams(userId: number): ClonedExamItem[] {
+  const db = getDb()
+  return db.prepare(`
+    SELECT id, title, subtitle, created_at, updated_at, cloned_from_share_token,
+           json_array_length(json_extract(exam_json, '$.questions')) AS question_count
+    FROM saved_exams
+    WHERE user_id = ? AND cloned_from_share_token IS NOT NULL
+    ORDER BY updated_at DESC
+  `).all(userId) as ClonedExamItem[]
+}
+
+export function setFavorite(id: number, userId: number, isFavorite: boolean): boolean {
+  const db = getDb()
+  const result = db.prepare(`
+    UPDATE saved_exams
+    SET is_favorite = ?, updated_at = unixepoch()
+    WHERE id = ? AND user_id = ?
+  `).run(isFavorite ? 1 : 0, id, userId)
+  return result.changes > 0
+}
+
+export function getExamRawJson(id: number, userId: number): { title: string; exam_json: string } | undefined {
+  const db = getDb()
+  return db.prepare('SELECT title, exam_json FROM saved_exams WHERE id = ? AND user_id = ?').get(id, userId) as { title: string; exam_json: string } | undefined
+}
+
+export function duplicateOwnExam(userId: number, sourceExam: DbExam): { id: number } {
+  const db = getDb()
+  const parsed = JSON.parse(sourceExam.exam_json)
+  parsed.id = undefined
+  const result = db.prepare(`
+    INSERT INTO saved_exams (user_id, title, subtitle, exam_json, tags)
+    VALUES (?, ?, ?, ?, ?)
+  `).run(userId, sourceExam.title + ' (copy)', sourceExam.subtitle, JSON.stringify(parsed), sourceExam.tags ?? '[]')
+  return { id: result.lastInsertRowid as number }
+}
+
+export function setExamCollection(id: number, userId: number, collectionId: number | null): boolean {
+  const db = getDb()
+  const result = db.prepare(`
+    UPDATE saved_exams
+    SET collection_id = ?, updated_at = unixepoch()
+    WHERE id = ? AND user_id = ?
+  `).run(collectionId, id, userId)
+  return result.changes > 0
+}

backend/src/repositories/resultRepo.ts

@@ -110,3 +110,62 @@ export function countResultsByUser(userId: number): number {
   const row = db.prepare('SELECT COUNT(*) AS cnt FROM exam_results WHERE user_id = ?').get(userId) as { cnt: number }
   return row.cnt
 }
+
+export function getResultsWithExamJson(userId: number, limit = 100): Array<{
+  title: string
+  score_points: number
+  total_points: number
+  correct_count: number
+  graded_count: number
+  completed_at: number
+  exam_json: string
+  exam_id: number | null
+}> {
+  const db = getDb()
+  return db.prepare(`
+    SELECT title, score_points, total_points, correct_count, graded_count, completed_at, exam_json, exam_id
+    FROM exam_results
+    WHERE user_id = ?
+    ORDER BY completed_at DESC
+    LIMIT ?
+  `).all(userId, limit) as Array<{
+    title: string
+    score_points: number
+    total_points: number
+    correct_count: number
+    graded_count: number
+    completed_at: number
+    exam_json: string
+    exam_id: number | null
+  }>
+}
+
+export interface ScoreTrend {
+  completed_at: number
+  score_pct: number
+  title: string
+  exam_id: number | null
+}
+
+export function getScoreTrends(userId: number, limit = 30): Array<{
+  completed_at: number
+  score_points: number
+  total_points: number
+  title: string
+  exam_id: number | null
+}> {
+  const db = getDb()
+  return db.prepare(`
+    SELECT completed_at, score_points, total_points, title, exam_id
+    FROM exam_results
+    WHERE user_id = ? AND total_points > 0
+    ORDER BY completed_at ASC
+    LIMIT ?
+  `).all(userId, limit) as Array<{
+    completed_at: number
+    score_points: number
+    total_points: number
+    title: string
+    exam_id: number | null
+  }>
+}

backend/src/routes/collections.ts

@@ -0,0 +1,97 @@
+import { Router } from 'express'
+import { validateBody, validateParams } from '../middleware/validate.js'
+import { asyncHandler } from '../utils/asyncHandler.js'
+import { requireAuth } from '../middleware/auth.js'
+import { AppError } from '../middleware/error.js'
+import * as collectionRepo from '../repositories/collectionRepo.js'
+import * as examRepo from '../repositories/examRepo.js'
+import {
+  createCollectionSchema,
+  updateCollectionSchema,
+  collectionIdParamSchema,
+  moveExamSchema,
+} from '../validators/collectionSchemas.js'
+import { examIdParamSchema } from '../validators/examSchemas.js'
+import type { Request } from 'express'
+
+const router = Router()
+
+router.use(requireAuth)
+
+// GET /api/collections
+router.get(
+  '/',
+  asyncHandler(async (req: Request, res) => {
+    const collections = collectionRepo.listCollectionsByUser(req.user!.userId)
+    res.json(collections)
+  })
+)
+
+// POST /api/collections
+router.post(
+  '/',
+  validateBody(createCollectionSchema),
+  asyncHandler(async (req: Request, res) => {
+    const { id } = collectionRepo.createCollection(req.user!.userId, req.body.name)
+    res.status(201).json({ id, name: req.body.name })
+  })
+)
+
+// PUT /api/collections/:id
+router.put(
+  '/:id',
+  validateParams(collectionIdParamSchema),
+  validateBody(updateCollectionSchema),
+  asyncHandler(async (req: Request, res) => {
+    const id = Number(req.params.id)
+    const updated = collectionRepo.updateCollection(id, req.user!.userId, req.body.name)
+    if (!updated) {
+      throw new AppError(404, 'Collection not found')
+    }
+    res.json({ success: true })
+  })
+)
+
+// DELETE /api/collections/:id
+router.delete(
+  '/:id',
+  validateParams(collectionIdParamSchema),
+  asyncHandler(async (req: Request, res) => {
+    const id = Number(req.params.id)
+    const deleted = collectionRepo.deleteCollection(id, req.user!.userId)
+    if (!deleted) {
+      throw new AppError(404, 'Collection not found')
+    }
+    res.json({ success: true })
+  })
+)
+
+// POST /api/collections/move/:examId
+router.post(
+  '/move/:examId',
+  validateParams(examIdParamSchema),
+  validateBody(moveExamSchema),
+  asyncHandler(async (req: Request, res) => {
+    const examId = Number(req.params.examId)
+    const collectionId = req.body.collectionId ?? null
+
+    // Verify exam belongs to user
+    const exam = examRepo.getExamById(examId, req.user!.userId)
+    if (!exam) {
+      throw new AppError(404, 'Exam not found')
+    }
+
+    // If collectionId provided, verify it belongs to user
+    if (collectionId !== null) {
+      const collection = collectionRepo.getCollectionById(collectionId, req.user!.userId)
+      if (!collection) {
+        throw new AppError(404, 'Collection not found')
+      }
+    }
+
+    examRepo.setExamCollection(examId, req.user!.userId, collectionId)
+    res.json({ success: true })
+  })
+)
+
+export default router

backend/src/routes/exams.ts

@@ -4,7 +4,7 @@ import { asyncHandler } from '../utils/asyncHandler.js'
 import { requireAuth } from '../middleware/auth.js'
 import { AppError } from '../middleware/error.js'
 import * as examRepo from '../repositories/examRepo.js'
-import { saveExamSchema, updateExamSchema, examIdParamSchema } from '../validators/examSchemas.js'
+import { saveExamSchema, updateExamSchema, examIdParamSchema, favoriteSchema, shareModeSchema, batchDeleteSchema } from '../validators/examSchemas.js'
 import { sanitizeExam } from '../utils/sanitizeExam.js'
 import type { Request } from 'express'
 
@@ -33,7 +33,14 @@ router.get(
       throw new AppError(404, 'Exam not found')
     }
     const parsedExam = JSON.parse(exam.exam_json)
-    res.json({ ...parsedExam, id: exam.id })
+    let tags: string[] = []
+    try {
+      tags = JSON.parse(exam.tags ?? '[]')
+      if (!Array.isArray(tags)) tags = []
+    } catch {
+      tags = []
+    }
+    res.json({ ...parsedExam, id: exam.id, tags })
   })
 )
 
@@ -43,11 +50,13 @@ router.post(
   validateBody(saveExamSchema),
   asyncHandler(async (req: Request, res) => {
     const exam = sanitizeExam(req.body.exam) as typeof req.body.exam
+    const tags = Array.isArray(req.body.tags) ? req.body.tags : []
     const { id } = examRepo.createExam(
       req.user!.userId,
       exam.title,
       exam.subtitle ?? null,
-      JSON.stringify(exam)
+      JSON.stringify(exam),
+      JSON.stringify(tags)
     )
     res.status(201).json({ id, title: exam.title })
   })
@@ -61,12 +70,14 @@ router.put(
   asyncHandler(async (req: Request, res) => {
     const id = Number(req.params.id)
     const exam = sanitizeExam(req.body.exam) as typeof req.body.exam
+    const tags = Array.isArray(req.body.tags) ? JSON.stringify(req.body.tags) : null
     const updated = examRepo.updateExam(
       id,
       req.user!.userId,
       exam.title,
       exam.subtitle ?? null,
-      JSON.stringify(exam)
+      JSON.stringify(exam),
+      tags
     )
     if (!updated) {
       throw new AppError(404, 'Exam not found')
@@ -89,4 +100,121 @@ router.delete(
   })
 )
 
+// POST /api/exams/:id/share
+router.post(
+  '/:id/share',
+  validateParams(examIdParamSchema),
+  asyncHandler(async (req: Request, res) => {
+    const id = Number(req.params.id)
+    const exam = examRepo.getExamById(id, req.user!.userId)
+    if (!exam) {
+      throw new AppError(404, 'Exam not found')
+    }
+    const token = exam.share_token ?? crypto.randomUUID().replace(/-/g, '')
+    const mode = exam.share_mode ?? 'clone'
+    examRepo.setShareToken(id, req.user!.userId, token, mode)
+    res.json({ shareToken: token, mode })
+  })
+)
+
+// PUT /api/exams/:id/share-mode
+router.put(
+  '/:id/share-mode',
+  validateParams(examIdParamSchema),
+  validateBody(shareModeSchema),
+  asyncHandler(async (req: Request, res) => {
+    const id = Number(req.params.id)
+    const updated = examRepo.setShareMode(id, req.user!.userId, req.body.mode)
+    if (!updated) {
+      throw new AppError(404, 'Exam not found')
+    }
+    res.json({ success: true })
+  })
+)
+
+// GET /api/exams/cloned
+router.get(
+  '/cloned',
+  asyncHandler(async (req: Request, res) => {
+    const exams = examRepo.listClonedExams(req.user!.userId)
+    res.json(exams)
+  })
+)
+
+// POST /api/exams/batch-delete
+router.post(
+  '/batch-delete',
+  validateBody(batchDeleteSchema),
+  asyncHandler(async (req: Request, res) => {
+    const ids: number[] = req.body.ids
+    let deleted = 0
+    for (const id of ids) {
+      if (examRepo.deleteExam(id, req.user!.userId)) {
+        deleted++
+      }
+    }
+    res.json({ deleted })
+  })
+)
+
+// POST /api/exams/:id/unshare
+router.post(
+  '/:id/unshare',
+  validateParams(examIdParamSchema),
+  asyncHandler(async (req: Request, res) => {
+    const id = Number(req.params.id)
+    const cleared = examRepo.clearShareToken(id, req.user!.userId)
+    if (!cleared) {
+      throw new AppError(404, 'Exam not found')
+    }
+    res.json({ success: true })
+  })
+)
+
+// PATCH /api/exams/:id/favorite
+router.patch(
+  '/:id/favorite',
+  validateParams(examIdParamSchema),
+  validateBody(favoriteSchema),
+  asyncHandler(async (req: Request, res) => {
+    const id = Number(req.params.id)
+    const updated = examRepo.setFavorite(id, req.user!.userId, req.body.isFavorite)
+    if (!updated) {
+      throw new AppError(404, 'Exam not found')
+    }
+    res.json({ success: true })
+  })
+)
+
+// GET /api/exams/:id/export
+router.get(
+  '/:id/export',
+  validateParams(examIdParamSchema),
+  asyncHandler(async (req: Request, res) => {
+    const id = Number(req.params.id)
+    const raw = examRepo.getExamRawJson(id, req.user!.userId)
+    if (!raw) {
+      throw new AppError(404, 'Exam not found')
+    }
+    res.setHeader('Content-Type', 'application/json')
+    res.setHeader('Content-Disposition', `attachment; filename="${encodeURIComponent(raw.title)}.json"`)
+    res.send(raw.exam_json)
+  })
+)
+
+// POST /api/exams/:id/duplicate
+router.post(
+  '/:id/duplicate',
+  validateParams(examIdParamSchema),
+  asyncHandler(async (req: Request, res) => {
+    const id = Number(req.params.id)
+    const exam = examRepo.getExamById(id, req.user!.userId)
+    if (!exam) {
+      throw new AppError(404, 'Exam not found')
+    }
+    const { id: newId } = examRepo.duplicateOwnExam(req.user!.userId, exam)
+    res.status(201).json({ id: newId, title: exam.title + ' (copy)' })
+  })
+)
+
 export default router

backend/src/routes/results.ts

@@ -4,7 +4,9 @@ import { asyncHandler } from '../utils/asyncHandler.js'
 import { requireAuth } from '../middleware/auth.js'
 import { AppError } from '../middleware/error.js'
 import * as resultRepo from '../repositories/resultRepo.js'
+import * as examRepo from '../repositories/examRepo.js'
 import { submitResultSchema, resultIdParamSchema } from '../validators/resultSchemas.js'
+import { analyzeResults } from '../services/studyCoach.js'
 import type { Request } from 'express'
 
 const router = Router()
@@ -78,4 +80,50 @@ router.delete(
   })
 )
 
+// GET /api/results/analyze
+router.get(
+  '/analyze',
+  asyncHandler(async (req: Request, res) => {
+    const rawResults = resultRepo.getResultsWithExamJson(req.user!.userId, 200)
+    const lang = typeof req.query.lang === 'string' ? req.query.lang : 'en'
+    const analysis = await analyzeResults(rawResults, lang)
+
+    // Find weakest exam (lowest score that still exists in workspace)
+    let weakestExamId: number | null = null
+    if (rawResults.length > 0) {
+      const sorted = [...rawResults].sort((a, b) => {
+        const pa = a.total_points > 0 ? a.score_points / a.total_points : 0
+        const pb = b.total_points > 0 ? b.score_points / b.total_points : 0
+        return pa - pb
+      })
+      for (const r of sorted) {
+        if (r.exam_id) {
+          const exam = examRepo.getExamById(r.exam_id, req.user!.userId)
+          if (exam) {
+            weakestExamId = r.exam_id
+            break
+          }
+        }
+      }
+    }
+
+    res.json({ ...analysis, weakestExamId })
+  })
+)
+
+// GET /api/results/trends
+router.get(
+  '/trends',
+  asyncHandler(async (req: Request, res) => {
+    const raw = resultRepo.getScoreTrends(req.user!.userId, 30)
+    const trends = raw.map((r) => ({
+      completed_at: r.completed_at,
+      score_pct: r.total_points > 0 ? Math.round((r.score_points / r.total_points) * 100) : 0,
+      title: r.title,
+      exam_id: r.exam_id,
+    }))
+    res.json(trends)
+  })
+)
+
 export default router

backend/src/routes/share.ts

@@ -0,0 +1,45 @@
+import { Router } from 'express'
+import { asyncHandler } from '../utils/asyncHandler.js'
+import { AppError } from '../middleware/error.js'
+import { requireAuth } from '../middleware/auth.js'
+import * as examRepo from '../repositories/examRepo.js'
+import type { Request } from 'express'
+
+const router = Router()
+
+// GET /api/share/:token — public, no auth required
+router.get(
+  '/:token',
+  asyncHandler(async (req: Request, res) => {
+    const token = String(req.params.token)
+    const exam = examRepo.getExamByShareToken(token)
+    if (!exam) {
+      throw new AppError(404, 'Shared exam not found')
+    }
+    const parsed = JSON.parse(exam.exam_json)
+    res.json({
+      title: exam.title,
+      subtitle: exam.subtitle,
+      questionCount: JSON.parse(exam.exam_json).questions?.length ?? 0,
+      exam: parsed,
+      shareMode: exam.share_mode ?? 'clone',
+    })
+  })
+)
+
+// POST /api/share/:token/clone — requires auth
+router.post(
+  '/:token/clone',
+  requireAuth,
+  asyncHandler(async (req: Request, res) => {
+    const token = String(req.params.token)
+    const source = examRepo.getExamByShareToken(token)
+    if (!source) {
+      throw new AppError(404, 'Shared exam not found')
+    }
+    const { id } = examRepo.cloneExam(req.user!.userId, source, token)
+    res.status(201).json({ id, title: source.title + ' (copy)' })
+  })
+)
+
+export default router

backend/src/services/studyCoach.ts

@@ -0,0 +1,165 @@
+import OpenAI from 'openai'
+import { getSetting } from '../repositories/settingsRepo.js'
+
+export interface WeakArea {
+  category: string
+  avgScore: number
+  attempts: number
+}
+
+export interface StudyCoachResult {
+  weakAreas: WeakArea[]
+  studyTips: string[]
+  streakDays: number
+}
+
+interface ResultSummary {
+  title: string
+  scorePoints: number
+  totalPoints: number
+  correctCount: number
+  gradedCount: number
+  completedAt: number
+  categories: Record<string, { score: number; total: number }>
+}
+
+function getClient(): OpenAI | null {
+  const provider = getSetting('ai_provider')
+  const apiKey = getSetting('ai_api_key')
+  if (!provider || !apiKey) return null
+
+  const customBase = getSetting('ai_base_url')
+  const baseURL = provider === 'openai' ? undefined : (customBase || undefined)
+  return new OpenAI({ apiKey, baseURL })
+}
+
+function calculateStreak(results: Array<{ completed_at: number }>): number {
+  if (results.length === 0) return 0
+  const days = new Set<string>()
+  for (const r of results) {
+    const d = new Date(r.completed_at * 1000)
+    days.add(`${d.getFullYear()}-${d.getMonth()}-${d.getDate()}`)
+  }
+  const sorted = Array.from(days).sort()
+  if (sorted.length === 0) return 0
+
+  const today = new Date()
+  const todayStr = `${today.getFullYear()}-${today.getMonth()}-${today.getDate()}`
+
+  let streak = 0
+  for (let i = sorted.length - 1; i >= 0; i--) {
+    const expected = new Date(today)
+    expected.setDate(today.getDate() - (sorted.length - 1 - i))
+    const expectedStr = `${expected.getFullYear()}-${expected.getMonth()}-${expected.getDate()}`
+    if (sorted[i] === expectedStr || (i === sorted.length - 1 && sorted[i] === todayStr)) {
+      streak++
+    } else if (i === sorted.length - 1) {
+      // Most recent is not today — check if it was yesterday
+      const yesterday = new Date(today)
+      yesterday.setDate(today.getDate() - 1)
+      const yestStr = `${yesterday.getFullYear()}-${yesterday.getMonth()}-${yesterday.getDate()}`
+      if (sorted[i] === yestStr) {
+        streak++
+      } else {
+        break
+      }
+    } else {
+      break
+    }
+  }
+  return streak
+}
+
+export async function analyzeResults(
+  results: Array<{
+    title: string
+    score_points: number
+    total_points: number
+    correct_count: number
+    graded_count: number
+    completed_at: number
+    exam_json: string
+  }>,
+  language = 'en',
+): Promise<StudyCoachResult> {
+  const streakDays = calculateStreak(results)
+
+  // Build per-category stats from exam_json
+  const categoryStats: Record<string, { score: number; total: number; attempts: number }> = {}
+  for (const r of results) {
+    let exam: { questions?: Array<{ category?: string; points?: number }> } | undefined
+    try {
+      exam = JSON.parse(r.exam_json)
+    } catch {
+      continue
+    }
+    const questions = exam?.questions ?? []
+    // We don't have per-question results in the stored result, so we approximate
+    // using the overall score distributed across categories proportionally
+    const totalQuestionPoints = questions.reduce((sum, q) => sum + (q.points ?? 1), 0)
+    if (totalQuestionPoints === 0) continue
+    const overallRatio = r.total_points > 0 ? r.score_points / r.total_points : 0
+    for (const q of questions) {
+      const cat = q.category ?? 'Uncategorized'
+      const pts = q.points ?? 1
+      if (!categoryStats[cat]) {
+        categoryStats[cat] = { score: 0, total: 0, attempts: 0 }
+      }
+      categoryStats[cat].score += pts * overallRatio
+      categoryStats[cat].total += pts
+    }
+    // Mark attempt for each unique category in this exam
+    const catsInExam = new Set(questions.map((q) => q.category ?? 'Uncategorized'))
+    for (const cat of catsInExam) {
+      categoryStats[cat].attempts++
+    }
+  }
+
+  const weakAreas: WeakArea[] = Object.entries(categoryStats)
+    .map(([category, stats]) => ({
+      category,
+      avgScore: stats.total > 0 ? Math.round((stats.score / stats.total) * 100) : 0,
+      attempts: stats.attempts,
+    }))
+    .filter((w) => w.attempts >= 1)
+    .sort((a, b) => a.avgScore - b.avgScore)
+    .slice(0, 5)
+
+  const client = getClient()
+  if (!client || weakAreas.length === 0) {
+    return { weakAreas, studyTips: [], streakDays }
+  }
+
+  const model = getSetting('ai_model') || 'gpt-4o-mini'
+  const prompt = `You are a study coach. A student has taken several practice exams. Based on their performance per category, suggest 2-3 concise study tips to help them improve in their weakest areas. Respond ONLY with a JSON object containing:
+- "studyTips": string[] (2-3 short tips in ${language})
+
+Do not include any text outside the JSON object.
+
+Weak areas (score %, attempts):
+${weakAreas.map((w) => `- ${w.category}: ${w.avgScore}% over ${w.attempts} attempt(s)`).join('\n')}`
+
+  try {
+    const completion = await client.chat.completions.create({
+      model,
+      messages: [{ role: 'user', content: prompt }],
+      response_format: { type: 'json_object' },
+      temperature: 0.4,
+      max_completion_tokens: 400,
+    })
+
+    const raw = completion.choices[0]?.message?.content
+    if (!raw) {
+      return { weakAreas, studyTips: [], streakDays }
+    }
+
+    const parsed = JSON.parse(raw) as Record<string, unknown>
+    const tips = Array.isArray(parsed.studyTips)
+      ? parsed.studyTips.filter((t): t is string => typeof t === 'string')
+      : []
+
+    return { weakAreas, studyTips: tips, streakDays }
+  } catch {
+    return { weakAreas, studyTips: [], streakDays }
+  }
+}

backend/src/validators/collectionSchemas.ts

@@ -0,0 +1,17 @@
+import { z } from 'zod'
+
+export const createCollectionSchema = z.object({
+  name: z.string().min(1, 'Name is required').max(100),
+})
+
+export const updateCollectionSchema = z.object({
+  name: z.string().min(1, 'Name is required').max(100),
+})
+
+export const collectionIdParamSchema = z.object({
+  id: z.string().regex(/^\d+$/, 'ID must be a number'),
+})
+
+export const moveExamSchema = z.object({
+  collectionId: z.number().nullable().optional(),
+})

backend/src/validators/examSchemas.ts

@@ -80,14 +80,28 @@ export const examSchema = z.object({
 
 export const saveExamSchema = z.object({
   exam: examSchema,
+  tags: z.array(z.string()).optional(),
 })
 
 export const updateExamSchema = z.object({
   exam: examSchema,
+  tags: z.array(z.string()).optional(),
 })
 
 export const examIdParamSchema = z.object({
   id: z.string().regex(/^\d+$/, 'ID must be a number'),
 })
 
+export const favoriteSchema = z.object({
+  isFavorite: z.boolean(),
+})
+
+export const shareModeSchema = z.object({
+  mode: z.enum(['view', 'clone']),
+})
+
+export const batchDeleteSchema = z.object({
+  ids: z.array(z.number()),
+})
+
 export type ExamInput = z.infer<typeof examSchema>

frontend/src/App.tsx

@@ -35,6 +35,7 @@ import AdminDashboard from "./components/AdminDashboard";
 import SetupWizard from "./components/SetupWizard";
 import Workspace from "./components/Workspace";
 import ExamEditor from "./components/ExamEditor";
+import ShareView from "./components/ShareView";
 
 const withNotes = (state: ExamState): ExamState => ({
   ...state,
@@ -255,7 +256,7 @@ function AppInner() {
     setExamState(null);
     savedExamIdRef.current = null;
     sessionStorage.removeItem('brainwave.pendingResultId');
-    navigate("/");
+    navigate(user && isAuthenticated() ? "/workspace" : "/");
   };
 
   const restart = () => {
@@ -335,7 +336,7 @@ function AppInner() {
   }, [pathname, exam, examState, user, navigate, pendingResultId]);
 
   const handleAuthFlowDone = () => {
-    navigate("/");
+    navigate(user && isAuthenticated() ? "/workspace" : "/");
     setAuthModalOpen(true);
   };
 
@@ -473,14 +474,18 @@ function AppInner() {
         <Route
           path="/"
           element={
-            <Landing
-              onLoadExam={loadExam}
-              history={history}
-              onResume={resume}
-              onClearHistory={clearAllHistory}
-              onReviewAttempt={reviewAttempt}
-              onRetakeAttempt={retakeAttempt}
-            />
+            user && isAuthenticated() ? (
+              <Navigate to="/workspace" replace />
+            ) : (
+              <Landing
+                onLoadExam={loadExam}
+                history={history}
+                onResume={resume}
+                onClearHistory={clearAllHistory}
+                onReviewAttempt={reviewAttempt}
+                onRetakeAttempt={retakeAttempt}
+              />
+            )
           }
         />
         <Route
@@ -541,9 +546,10 @@ function AppInner() {
             )
           }
         />
-        <Route path="/workspace" element={<Navigate to="/workspace/exams" replace />} />
+        <Route path="/workspace" element={<Navigate to="/workspace/overview" replace />} />
         <Route path="/workspace/:tab" element={<Workspace onLoadExam={loadExam} />} />
         <Route path="/exam-editor/:id" element={<ExamEditor />} />
+        <Route path="/share/:token" element={<ShareView onLoadExam={loadExam} />} />
         <Route path="*" element={<Navigate to="/" replace />} />
       </Routes>
 

frontend/src/api/collectionApi.ts

@@ -0,0 +1,29 @@
+import { apiFetch } from '../utils/api.js'
+
+export interface Collection {
+  id: number
+  name: string
+  created_at: number
+  updated_at: number
+  exam_count: number
+}
+
+export function listCollections(): Promise<Collection[]> {
+  return apiFetch('/api/collections')
+}
+
+export function createCollection(name: string): Promise<{ id: number; name: string }> {
+  return apiFetch('/api/collections', { method: 'POST', body: JSON.stringify({ name }) })
+}
+
+export function updateCollection(id: number, name: string): Promise<{ success: boolean }> {
+  return apiFetch(`/api/collections/${id}`, { method: 'PUT', body: JSON.stringify({ name }) })
+}
+
+export function deleteCollection(id: number): Promise<{ success: boolean }> {
+  return apiFetch(`/api/collections/${id}`, { method: 'DELETE' })
+}
+
+export function moveExamToCollection(examId: number, collectionId: number | null): Promise<{ success: boolean }> {
+  return apiFetch(`/api/collections/move/${examId}`, { method: 'POST', body: JSON.stringify({ collectionId }) })
+}

frontend/src/api/examApi.ts

@@ -8,24 +8,85 @@ export interface ExamListItem {
   created_at: number
   updated_at: number
   question_count: number
+  share_token: string | null
+  is_favorite: number
+  tags: string
+  collection_id: number | null
 }
 
 export function listExams(): Promise<ExamListItem[]> {
   return apiFetch('/api/exams')
 }
 
-export function getExam(id: number): Promise<Exam> {
+export function getExam(id: number): Promise<Exam & { tags?: string[] }> {
   return apiFetch(`/api/exams/${id}`)
 }
 
-export function createExam(exam: Exam): Promise<{ id: number; title: string }> {
-  return apiFetch('/api/exams', { method: 'POST', body: JSON.stringify({ exam }) })
+export function createExam(exam: Exam, tags?: string[]): Promise<{ id: number; title: string }> {
+  return apiFetch('/api/exams', { method: 'POST', body: JSON.stringify({ exam, tags }) })
 }
 
-export function updateExam(id: number, exam: Exam): Promise<{ success: boolean }> {
-  return apiFetch(`/api/exams/${id}`, { method: 'PUT', body: JSON.stringify({ exam }) })
+export function updateExam(id: number, exam: Exam, tags?: string[]): Promise<{ success: boolean }> {
+  return apiFetch(`/api/exams/${id}`, { method: 'PUT', body: JSON.stringify({ exam, tags }) })
 }
 
 export function deleteExam(id: number): Promise<{ success: boolean }> {
   return apiFetch(`/api/exams/${id}`, { method: 'DELETE' })
 }
+
+export function shareExam(id: number): Promise<{ shareToken: string }> {
+  return apiFetch(`/api/exams/${id}/share`, { method: 'POST' })
+}
+
+export function unshareExam(id: number): Promise<{ success: boolean }> {
+  return apiFetch(`/api/exams/${id}/unshare`, { method: 'POST' })
+}
+
+export function getSharedExam(token: string): Promise<{ title: string; subtitle: string | null; questionCount: number; exam: unknown; shareMode: string }> {
+  return apiFetch(`/api/share/${token}`)
+}
+
+export function cloneSharedExam(token: string): Promise<{ id: number; title: string }> {
+  return apiFetch(`/api/share/${token}/clone`, { method: 'POST' })
+}
+
+export function setFavorite(id: number, isFavorite: boolean): Promise<{ success: boolean }> {
+  return apiFetch(`/api/exams/${id}/favorite`, { method: 'PATCH', body: JSON.stringify({ isFavorite }) })
+}
+
+export function exportExam(id: number): Promise<Blob> {
+  return fetch(`/api/exams/${id}/export`, {
+    headers: {
+      'Authorization': `Bearer ${localStorage.getItem('brainwave.auth.token') || ''}`,
+    },
+  }).then((res) => {
+    if (!res.ok) throw new Error('Export failed')
+    return res.blob()
+  })
+}
+
+export function duplicateExam(id: number): Promise<{ id: number; title: string }> {
+  return apiFetch(`/api/exams/${id}/duplicate`, { method: 'POST' })
+}
+
+export interface ClonedExamItem {
+  id: number
+  title: string
+  subtitle: string | null
+  created_at: number
+  updated_at: number
+  question_count: number
+  cloned_from_share_token: string
+}
+
+export function listClonedExams(): Promise<ClonedExamItem[]> {
+  return apiFetch('/api/exams/cloned')
+}
+
+export function setShareMode(id: number, mode: 'view' | 'clone'): Promise<{ success: boolean }> {
+  return apiFetch(`/api/exams/${id}/share-mode`, { method: 'PUT', body: JSON.stringify({ mode }) })
+}
+
+export function batchDelete(ids: number[]): Promise<{ deleted: number }> {
+  return apiFetch('/api/exams/batch-delete', { method: 'POST', body: JSON.stringify({ ids }) })
+}

frontend/src/api/resultApi.ts

@@ -41,3 +41,31 @@ export function submitResult(data: SubmitResultData): Promise<{ id: number }> {
 export function deleteResult(id: number): Promise<{ success: boolean }> {
   return apiFetch(`/api/results/${id}`, { method: 'DELETE' })
 }
+
+export interface WeakArea {
+  category: string
+  avgScore: number
+  attempts: number
+}
+
+export interface StudyCoachResult {
+  weakAreas: WeakArea[]
+  studyTips: string[]
+  streakDays: number
+  weakestExamId: number | null
+}
+
+export interface ScoreTrend {
+  completed_at: number
+  score_pct: number
+  title: string
+  exam_id: number | null
+}
+
+export function analyzeResults(): Promise<StudyCoachResult> {
+  return apiFetch('/api/results/analyze')
+}
+
+export function getScoreTrends(): Promise<ScoreTrend[]> {
+  return apiFetch('/api/results/trends')
+}

frontend/src/components/ExamEditor.tsx

@@ -58,6 +58,7 @@ export default function ExamEditor() {
   const [saving, setSaving] = useState(false)
   const [saveMsg, setSaveMsg] = useState<string | null>(null)
   const [hasChanges, setHasChanges] = useState(isNew)
+  const [tags, setTags] = useState<string[]>([])
 
   // Load existing exam
   useEffect(() => {
@@ -66,6 +67,7 @@ export default function ExamEditor() {
     examApi.getExam(examId!)
       .then((data) => {
         setExam(data)
+        setTags(data.tags ?? [])
         setHasChanges(false)
       })
       .catch((e) => setError((e as Error).message))
@@ -113,12 +115,12 @@ export default function ExamEditor() {
     setError(null)
     try {
       if (isNew) {
-        const data = await examApi.createExam(exam)
+        const data = await examApi.createExam(exam, tags)
         setSaveMsg(t('editor.examCreated'))
         setHasChanges(false)
         navigate(`/exam-editor/${data.id}`, { replace: true })
       } else {
-        await examApi.updateExam(examId!, exam)
+        await examApi.updateExam(examId!, exam, tags)
         setSaveMsg(t('editor.examSaved'))
         setHasChanges(false)
       }
@@ -165,6 +167,12 @@ export default function ExamEditor() {
         </div>
       )}
 
+      {!loading && (
+        <div style={{ padding: '8px 16px', borderBottom: '1px solid var(--line-2)', display: 'flex', alignItems: 'center', gap: 8 }}>
+          <TagsEditor tags={tags} onChange={(newTags) => { setTags(newTags); setHasChanges(true) }} />
+        </div>
+      )}
+
       {loading ? (
         <div className="exam-editor-loading">{t('common.loading')}</div>
       ) : (
@@ -234,6 +242,73 @@ export default function ExamEditor() {
   )
 }
 
+/* ─── Tags Editor ─── */
+
+function TagsEditor({ tags, onChange }: { tags: string[]; onChange: (tags: string[]) => void }) {
+  const { t } = useTranslation()
+  const [input, setInput] = useState('')
+
+  const addTag = () => {
+    const raw = input.trim().toLowerCase().replace(/[^a-z0-9\-_]/g, '')
+    if (!raw) return
+    if (tags.includes(raw)) return
+    onChange([...tags, raw])
+    setInput('')
+  }
+
+  const removeTag = (tag: string) => {
+    onChange(tags.filter((t) => t !== tag))
+  }
+
+  return (
+    <div style={{ display: 'flex', alignItems: 'center', gap: 8, flexWrap: 'wrap', flex: 1 }}>
+      <span style={{ fontSize: 12, color: 'var(--ink-3)' }}>{t('editor.tagsLabel')}</span>
+      {tags.map((tag) => (
+        <span
+          key={tag}
+          style={{
+            fontSize: 11,
+            padding: '2px 8px',
+            borderRadius: 4,
+            background: 'var(--paper)',
+            color: 'var(--ink-3)',
+            border: '1px solid var(--line-2)',
+            display: 'inline-flex',
+            alignItems: 'center',
+            gap: 4,
+          }}
+        >
+          {tag}
+          <button
+            onClick={() => removeTag(tag)}
+            style={{ background: 'none', border: 'none', cursor: 'pointer', padding: 0, fontSize: 11, color: 'var(--wrong)' }}
+          >
+            ✕
+          </button>
+        </span>
+      ))}
+      <div style={{ display: 'flex', gap: 4, alignItems: 'center' }}>
+        <input
+          className="input"
+          value={input}
+          onChange={(e) => setInput(e.target.value)}
+          onKeyDown={(e) => {
+            if (e.key === 'Enter') {
+              e.preventDefault()
+              addTag()
+            }
+          }}
+          placeholder={t('editor.tagsPlaceholder')}
+          style={{ width: 140, fontSize: 12 }}
+        />
+        <button className="btn btn-sm" onClick={addTag} style={{ fontSize: 11 }}>
+          {t('editor.addTag')}
+        </button>
+      </div>
+    </div>
+  )
+}
+
 /* ─── Question Editor ─── */
 
 interface QEProps {
@@ -332,13 +407,12 @@ function MultipleChoiceEditor({ q, onChange }: { q: Question; onChange: QEProps[
   const setAnswer = (a: string) => onChange((q) => { q.answer = a })
 
   const addChoice = () => {
-    const nextId = String.fromCharCode(97 + choices.length) // a, b, c...
+    const nextId = String.fromCharCode(97 + choices.length)
     setChoices([...choices, { id: nextId, text: '' }])
   }
 
   const removeChoice = (idx: number) => {
     const next = choices.filter((_, i) => i !== idx)
-    // Renumber
     const renumbered = next.map((c, i) => ({ ...c, id: String.fromCharCode(97 + i) }))
     setChoices(renumbered)
     if (q.answer === choices[idx]?.id) setAnswer(renumbered[0]?.id ?? '')
@@ -752,7 +826,6 @@ function OrderEditor({ q, onChange }: { q: Question; onChange: QEProps['onChange
           <p className="faint" style={{ fontSize: 12, marginTop: 4 }}>
             {t('editor.correctOrderHint')}
           </p>
-          {/* Sync answer to current item order */}
           <button
             className="btn btn-sm"
             style={{ marginTop: 8 }}

frontend/src/components/MyExams.tsx

@@ -2,6 +2,7 @@ import { useState, useEffect, useCallback } from 'react'
 import { useNavigate } from 'react-router-dom'
 import { useTranslation } from 'react-i18next'
 import * as examApi from '../api/examApi'
+import * as collectionApi from '../api/collectionApi'
 import type { Exam } from '../types'
 
 interface SavedExam {
@@ -11,27 +12,57 @@ interface SavedExam {
   question_count: number
   created_at: number
   updated_at: number
+  share_token: string | null
+  is_favorite: number
+  tags: string
+  collection_id: number | null
 }
 
 interface Props {
   onLoadExam: (exam: Exam, saveToWorkspace?: boolean, examId?: number | null) => void
 }
 
-export default function MyExams({ onLoadExam }: Props) {
+type CollectionFilter = number | null | 'all' | 'uncategorized'
+
+export default function MyExams({ onLoadExam }: Readonly<Props>) {
   const { t } = useTranslation()
   const navigate = useNavigate()
   const [exams, setExams] = useState<SavedExam[]>([])
+  const [collections, setCollections] = useState<collectionApi.Collection[]>([])
   const [loading, setLoading] = useState(true)
   const [error, setError] = useState<string | null>(null)
   const [deleteConfirm, setDeleteConfirm] = useState<number | null>(null)
   const [startingId, setStartingId] = useState<number | null>(null)
+  const [shareOpenId, setShareOpenId] = useState<number | null>(null)
+  const [sharingId, setSharingId] = useState<number | null>(null)
+  const [duplicatingId, setDuplicatingId] = useState<number | null>(null)
+  const [exportingId, setExportingId] = useState<number | null>(null)
+  const [searchQuery, setSearchQuery] = useState('')
+  const [activeFilter, setActiveFilter] = useState<CollectionFilter>('all')
+  const [showNewCollection, setShowNewCollection] = useState(false)
+  const [newCollectionName, setNewCollectionName] = useState('')
+  const [creatingCollection, setCreatingCollection] = useState(false)
+  const [moveMenuExamId, setMoveMenuExamId] = useState<number | null>(null)
+  const [movingExamId, setMovingExamId] = useState<number | null>(null)
+  const [editingCollectionId, setEditingCollectionId] = useState<number | null>(null)
+  const [editingCollectionName, setEditingCollectionName] = useState('')
+  const [deleteCollectionId, setDeleteCollectionId] = useState<number | null>(null)
+  const [selectedIds, setSelectedIds] = useState<Set<number>>(new Set())
+  const [batchMoveOpen, setBatchMoveOpen] = useState(false)
+  const [batchDeleting, setBatchDeleting] = useState(false)
+  const [batchExporting, setBatchExporting] = useState(false)
+  const [batchMoving, setBatchMoving] = useState(false)
 
-  const loadExams = useCallback(async () => {
+  const loadData = useCallback(async () => {
     setLoading(true)
     setError(null)
     try {
-      const data = await examApi.listExams()
-      setExams(data)
+      const [examData, collectionData] = await Promise.all([
+        examApi.listExams(),
+        collectionApi.listCollections(),
+      ])
+      setExams(examData)
+      setCollections(collectionData)
     } catch (e) {
       setError((e as Error).message)
     } finally {
@@ -40,14 +71,14 @@ export default function MyExams({ onLoadExam }: Props) {
   }, [])
 
   useEffect(() => {
-    void loadExams()
-  }, [loadExams])
+    void loadData()
+  }, [loadData])
 
   const deleteExam = async (id: number) => {
     try {
       await examApi.deleteExam(id)
       setDeleteConfirm(null)
-      void loadExams()
+      void loadData()
     } catch (e) {
       setError((e as Error).message)
     }
@@ -68,97 +99,707 @@ export default function MyExams({ onLoadExam }: Props) {
     }
   }
 
+  const handleShare = async (id: number) => {
+    setSharingId(id)
+    try {
+      const res = await examApi.shareExam(id)
+      const url = `${window.location.origin}/share/${res.shareToken}`
+      await navigator.clipboard.writeText(url)
+      setShareOpenId(null)
+      setExams((prev) => prev.map((e) => (e.id === id ? { ...e, share_token: res.shareToken } : e)))
+    } catch (e) {
+      setError((e as Error).message)
+    } finally {
+      setSharingId(null)
+    }
+  }
+
+  const handleUnshare = async (id: number) => {
+    try {
+      await examApi.unshareExam(id)
+      setShareOpenId(null)
+      setExams((prev) => prev.map((e) => (e.id === id ? { ...e, share_token: null } : e)))
+    } catch (e) {
+      setError((e as Error).message)
+    }
+  }
+
+  const handleFavorite = async (id: number, isFavorite: boolean) => {
+    try {
+      await examApi.setFavorite(id, isFavorite)
+      setExams((prev) => prev.map((e) => {
+        if (e.id !== id) return e
+        const updated = { ...e, is_favorite: isFavorite ? 1 : 0 }
+        return updated
+      }).sort((a, b) => (b.is_favorite - a.is_favorite) || (b.updated_at - a.updated_at)))
+    } catch (e) {
+      setError((e as Error).message)
+    }
+  }
+
+  const handleExport = async (id: number, title: string) => {
+    setExportingId(id)
+    try {
+      const blob = await examApi.exportExam(id)
+      const url = URL.createObjectURL(blob)
+      const a = document.createElement('a')
+      a.href = url
+      a.download = `${title.replace(/[^a-z0-9]/gi, '_').toLowerCase()}.json`
+      a.click()
+      URL.revokeObjectURL(url)
+    } catch (e) {
+      setError((e as Error).message)
+    } finally {
+      setExportingId(null)
+    }
+  }
+
+  const handleDuplicate = async (id: number) => {
+    setDuplicatingId(id)
+    try {
+      await examApi.duplicateExam(id)
+      void loadData()
+    } catch (e) {
+      setError((e as Error).message)
+    } finally {
+      setDuplicatingId(null)
+    }
+  }
+
+  const handleCreateCollection = async () => {
+    const name = newCollectionName.trim()
+    if (!name) return
+    setCreatingCollection(true)
+    try {
+      await collectionApi.createCollection(name)
+      setNewCollectionName('')
+      setShowNewCollection(false)
+      void loadData()
+    } catch (e) {
+      setError((e as Error).message)
+    } finally {
+      setCreatingCollection(false)
+    }
+  }
+
+  const handleMoveExam = async (examId: number, collectionId: number | null) => {
+    setMovingExamId(examId)
+    try {
+      await collectionApi.moveExamToCollection(examId, collectionId)
+      setMoveMenuExamId(null)
+      setExams((prev) => prev.map((e) => e.id === examId ? { ...e, collection_id: collectionId } : e))
+      setCollections((prev) => prev.map((c) => {
+        if (collectionId !== null && c.id === collectionId) return { ...c, exam_count: c.exam_count + 1 }
+        const oldExam = exams.find((e) => e.id === examId)
+        if (oldExam?.collection_id !== null && c.id === oldExam?.collection_id) return { ...c, exam_count: Math.max(0, c.exam_count - 1) }
+        return c
+      }))
+    } catch (e) {
+      setError((e as Error).message)
+    } finally {
+      setMovingExamId(null)
+    }
+  }
+
+  const handleRenameCollection = async (id: number) => {
+    const name = editingCollectionName.trim()
+    if (!name) {
+      setEditingCollectionId(null)
+      return
+    }
+    try {
+      await collectionApi.updateCollection(id, name)
+      setCollections((prev) => prev.map((c) => c.id === id ? { ...c, name } : c))
+      setEditingCollectionId(null)
+    } catch (e) {
+      setError((e as Error).message)
+    }
+  }
+
+  const handleDeleteCollection = async (id: number) => {
+    try {
+      await collectionApi.deleteCollection(id)
+      setDeleteCollectionId(null)
+      setExams((prev) => prev.map((e) => e.collection_id === id ? { ...e, collection_id: null } : e))
+      setCollections((prev) => prev.filter((c) => c.id !== id))
+    } catch (e) {
+      setError((e as Error).message)
+    }
+  }
+
+  const toggleSelect = (id: number) => {
+    setSelectedIds((prev) => {
+      const next = new Set(prev)
+      if (next.has(id)) next.delete(id)
+      else next.add(id)
+      return next
+    })
+  }
+
+  const selectAllFiltered = () => {
+    setSelectedIds(new Set(filteredExams.map((e) => e.id)))
+  }
+
+  const clearSelection = () => {
+    setSelectedIds(new Set())
+  }
+
+  const handleBatchDelete = async () => {
+    if (selectedIds.size === 0) return
+    if (!window.confirm(t('workspace.batchDeleteConfirm'))) return
+    setBatchDeleting(true)
+    try {
+      await examApi.batchDelete(Array.from(selectedIds))
+      setSelectedIds(new Set())
+      void loadData()
+    } catch (e) {
+      setError((e as Error).message)
+    } finally {
+      setBatchDeleting(false)
+    }
+  }
+
+  const handleBatchExport = async () => {
+    if (selectedIds.size === 0) return
+    setBatchExporting(true)
+    try {
+      for (const id of selectedIds) {
+        const exam = exams.find((e) => e.id === id)
+        if (exam) {
+          const blob = await examApi.exportExam(id)
+          const url = URL.createObjectURL(blob)
+          const a = document.createElement('a')
+          a.href = url
+          a.download = `${exam.title.replace(/[^a-z0-9]/gi, '_').toLowerCase()}.json`
+          document.body.appendChild(a)
+          a.click()
+          document.body.removeChild(a)
+          URL.revokeObjectURL(url)
+        }
+      }
+    } catch (e) {
+      setError((e as Error).message)
+    } finally {
+      setBatchExporting(false)
+    }
+  }
+
+  const handleBatchMove = async (collectionId: number | null) => {
+    if (selectedIds.size === 0) return
+    setBatchMoving(true)
+    try {
+      for (const id of selectedIds) {
+        await collectionApi.moveExamToCollection(id, collectionId)
+      }
+      setBatchMoveOpen(false)
+      setSelectedIds(new Set())
+      void loadData()
+    } catch (e) {
+      setError((e as Error).message)
+    } finally {
+      setBatchMoving(false)
+    }
+  }
+
   const formatDate = (ts: number) => {
     const d = new Date(ts * 1000)
     return d.toLocaleDateString('en-US', { month: 'short', day: 'numeric', year: 'numeric' })
   }
 
+  const parseTags = (tagsJson: string): string[] => {
+    try {
+      const parsed = JSON.parse(tagsJson)
+      return Array.isArray(parsed) ? parsed : []
+    } catch {
+      return []
+    }
+  }
+
+  const filteredExams = exams.filter((exam) => {
+    if (!searchQuery.trim()) return true
+    const q = searchQuery.toLowerCase()
+    const tags = parseTags(exam.tags)
+    return (
+      exam.title.toLowerCase().includes(q) ||
+      (exam.subtitle?.toLowerCase().includes(q) ?? false) ||
+      tags.some((t) => t.toLowerCase().includes(q))
+    )
+  }).filter((exam) => {
+    if (activeFilter === 'all') return true
+    if (activeFilter === 'uncategorized') return exam.collection_id === null
+    return exam.collection_id === activeFilter
+  })
+
+  const uncategorizedCount = exams.filter((e) => e.collection_id === null).length
+
   return (
-    <div className="workspace-section fade-in">
-      <div className="workspace-section-header">
-        <div>
-          <div className="workspace-section-eyebrow">{t('workspace.myWorkspace')}</div>
-          <h2 className="workspace-section-title">{t('workspace.myExams')}</h2>
-        </div>
-        <button className="btn btn-primary btn-sm" onClick={createNewExam}>
-          + {t('workspace.newExam')}
-        </button>
-      </div>
-
-      {error && (
-        <div className="workspace-alert workspace-alert-error">
-          <span>{error}</span>
-          <button onClick={() => setError(null)} className="workspace-alert-close">×</button>
-        </div>
-      )}
-
-      {loading ? (
-        <div className="workspace-empty">{t('common.loading')}</div>
-      ) : exams.length === 0 ? (
-        <div className="workspace-empty">
-          <div className="workspace-empty-icon">◇</div>
-          <div className="workspace-empty-title">{t('workspace.noSavedExams')}</div>
-          <div className="workspace-empty-desc">
-            {t('workspace.noSavedExamsDesc')}
-          </div>
-          <button className="btn btn-primary" onClick={createNewExam} style={{ marginTop: 16 }}>
-            {t('workspace.createFirstExam')}
+    <div className="workspace-section fade-in" style={{ display: 'flex', gap: 20 }}>
+      {/* Collections Sidebar */}
+      <div style={{ width: 220, flexShrink: 0 }}>
+        <div style={{ fontSize: 11, fontWeight: 600, textTransform: 'uppercase', letterSpacing: '0.08em', color: 'var(--ink-3)', marginBottom: 10, display: 'flex', alignItems: 'center', justifyContent: 'space-between' }}>
+          {t('workspace.collections')}
+          <button
+            className="btn btn-ghost btn-sm"
+            style={{ fontSize: 16, padding: '2px 6px', lineHeight: 1 }}
+            onClick={() => setShowNewCollection(true)}
+            title={t('workspace.newCollection')}
+          >
+            +
           </button>
         </div>
-      ) : (
-        <div className="workspace-list">
-          {exams.map((exam) => (
-            <div key={exam.id} className="workspace-card">
-              <div className="workspace-card-body">
-                <div className="workspace-card-title">{exam.title}</div>
-                {exam.subtitle && (
-                  <div className="workspace-card-sub">{exam.subtitle}</div>
-                )}
-                <div className="workspace-card-meta">
-                  <span>{exam.question_count} {exam.question_count === 1 ? t('common.question') : t('common.questions')}</span>
-                  <span>·</span>
-                  <span>{t('workspace.updated')} {formatDate(exam.updated_at)}</span>
+
+        {showNewCollection && (
+          <div style={{ marginBottom: 8, display: 'flex', gap: 4 }}>
+            <input
+              type="text"
+              className="input"
+              placeholder={t('workspace.collectionNamePlaceholder')}
+              value={newCollectionName}
+              onChange={(e) => setNewCollectionName(e.target.value)}
+              onKeyDown={(e) => { if (e.key === 'Enter') void handleCreateCollection() }}
+              style={{ fontSize: 12, padding: '4px 8px', flex: 1 }}
+              autoFocus
+            />
+            <button className="btn btn-sm btn-primary" onClick={() => void handleCreateCollection()} disabled={creatingCollection} style={{ fontSize: 11, padding: '4px 8px' }}>
+              {t('workspace.create')}
+            </button>
+            <button className="btn btn-sm btn-ghost" onClick={() => { setShowNewCollection(false); setNewCollectionName('') }} style={{ fontSize: 11, padding: '4px 8px' }}>
+              {t('common.cancel')}
+            </button>
+          </div>
+        )}
+
+        <div style={{ display: 'flex', flexDirection: 'column', gap: 2 }}>
+          <button
+            className={`btn btn-ghost btn-sm${activeFilter === 'all' ? ' active' : ''}`}
+            onClick={() => setActiveFilter('all')}
+            style={{ justifyContent: 'space-between', textAlign: 'left', fontWeight: activeFilter === 'all' ? 600 : 400 }}
+          >
+            <span>{t('workspace.allExams')}</span>
+            <span className="mono" style={{ fontSize: 11, color: 'var(--ink-3)' }}>{exams.length}</span>
+          </button>
+          <button
+            className={`btn btn-ghost btn-sm${activeFilter === 'uncategorized' ? ' active' : ''}`}
+            onClick={() => setActiveFilter('uncategorized')}
+            style={{ justifyContent: 'space-between', textAlign: 'left', fontWeight: activeFilter === 'uncategorized' ? 600 : 400 }}
+          >
+            <span>{t('workspace.uncategorized')}</span>
+            <span className="mono" style={{ fontSize: 11, color: 'var(--ink-3)' }}>{uncategorizedCount}</span>
+          </button>
+          {collections.map((col) => (
+            <div key={col.id} style={{ position: 'relative' }}>
+              {editingCollectionId === col.id ? (
+                <div style={{ display: 'flex', gap: 4, padding: '2px 0' }}>
+                  <input
+                    type="text"
+                    className="input"
+                    value={editingCollectionName}
+                    onChange={(e) => setEditingCollectionName(e.target.value)}
+                    onKeyDown={(e) => {
+                      if (e.key === 'Enter') void handleRenameCollection(col.id)
+                      if (e.key === 'Escape') setEditingCollectionId(null)
+                    }}
+                    onBlur={() => void handleRenameCollection(col.id)}
+                    style={{ fontSize: 12, padding: '3px 6px', flex: 1 }}
+                    autoFocus
+                  />
                 </div>
-              </div>
-              <div className="workspace-card-actions">
+              ) : (
                 <button
-                  className="btn btn-primary btn-sm"
-                  onClick={() => void startExam(exam.id)}
-                  disabled={startingId === exam.id}
+                  className={`btn btn-ghost btn-sm${activeFilter === col.id ? ' active' : ''}`}
+                  onClick={() => setActiveFilter(col.id)}
+                  onContextMenu={(e) => {
+                    e.preventDefault()
+                    setEditingCollectionName(col.name)
+                    setEditingCollectionId(col.id)
+                  }}
+                  style={{ justifyContent: 'space-between', textAlign: 'left', fontWeight: activeFilter === col.id ? 600 : 400 }}
                 >
-                  {startingId === exam.id ? t('common.loading') : t('workspace.takeExam')}
+                  <span style={{ overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' }}>{col.name}</span>
+                  <span className="mono" style={{ fontSize: 11, color: 'var(--ink-3)', flexShrink: 0 }}>{col.exam_count}</span>
                 </button>
-                <button
-                  className="btn btn-sm"
-                  onClick={() => navigate(`/exam-editor/${exam.id}`)}
-                  disabled={startingId === exam.id}
-                >
-                  {t('common.edit')}
-                </button>
-                {deleteConfirm === exam.id ? (
-                  <div className="workspace-delete-confirm">
-                    <button className="btn btn-sm admin-btn-danger" onClick={() => void deleteExam(exam.id)}>
+              )}
+              {activeFilter === col.id && editingCollectionId !== col.id && (
+                <div style={{ display: 'flex', gap: 4, padding: '0 8px 4px', marginTop: -2 }}>
+                  <button className="btn btn-ghost btn-sm" style={{ fontSize: 10, padding: '2px 6px' }} onClick={() => { setEditingCollectionName(col.name); setEditingCollectionId(col.id) }}>
+                    {t('workspace.rename')}
+                  </button>
+                  <button className="btn btn-ghost btn-sm admin-btn-danger-ghost" style={{ fontSize: 10, padding: '2px 6px' }} onClick={() => setDeleteCollectionId(col.id)}>
+                    {t('common.delete')}
+                  </button>
+                </div>
+              )}
+              {deleteCollectionId === col.id && (
+                <div style={{ padding: '4px 8px', fontSize: 11, background: 'var(--wrong-weak)', borderRadius: 6, margin: '2px 0' }}>
+                  <div style={{ marginBottom: 4 }}>{t('workspace.deleteCollectionConfirm')}</div>
+                  <div style={{ display: 'flex', gap: 4 }}>
+                    <button className="btn btn-sm admin-btn-danger" style={{ fontSize: 10, padding: '2px 8px' }} onClick={() => void handleDeleteCollection(col.id)}>
                       {t('common.confirm')}
                     </button>
-                    <button className="btn btn-ghost btn-sm" onClick={() => setDeleteConfirm(null)}>
+                    <button className="btn btn-sm btn-ghost" style={{ fontSize: 10, padding: '2px 8px' }} onClick={() => setDeleteCollectionId(null)}>
                       {t('common.cancel')}
                     </button>
                   </div>
-                ) : (
-                  <button
-                    className="btn btn-ghost btn-sm admin-btn-danger-ghost"
-                    onClick={() => setDeleteConfirm(exam.id)}
-                    title={t('common.delete')}
-                    disabled={startingId === exam.id}
-                  >
-                    ✕
-                  </button>
-                )}
-              </div>
+                </div>
+              )}
             </div>
           ))}
         </div>
-      )}
+      </div>
+
+      {/* Exams List */}
+      <div style={{ flex: 1, minWidth: 0 }}>
+        <div className="workspace-section-header">
+          <div>
+            <div className="workspace-section-eyebrow">{t('workspace.myWorkspace')}</div>
+            <h2 className="workspace-section-title">{t('workspace.myExams')}</h2>
+          </div>
+          <button className="btn btn-primary btn-sm" onClick={createNewExam}>
+            + {t('workspace.newExam')}
+          </button>
+        </div>
+
+        {/* Search */}
+        <div style={{ marginBottom: 16 }}>
+          <input
+            type="text"
+            className="input"
+            placeholder={t('workspace.searchExams')}
+            value={searchQuery}
+            onChange={(e) => setSearchQuery(e.target.value)}
+            style={{ maxWidth: 400 }}
+          />
+        </div>
+
+        {/* Batch toolbar */}
+        {!loading && filteredExams.length > 0 && (
+          <div style={{ display: 'flex', alignItems: 'center', gap: 8, marginBottom: 12, flexWrap: 'wrap' }}>
+            <label style={{ display: 'flex', alignItems: 'center', gap: 6, fontSize: 13, cursor: 'pointer', userSelect: 'none' }}>
+              <input
+                type="checkbox"
+                checked={selectedIds.size > 0 && selectedIds.size === filteredExams.length}
+                onChange={() => {
+                  if (selectedIds.size === filteredExams.length) clearSelection()
+                  else selectAllFiltered()
+                }}
+                ref={(el) => {
+                  if (el) el.indeterminate = selectedIds.size > 0 && selectedIds.size < filteredExams.length
+                }}
+              />
+              {selectedIds.size === 0 ? t('workspace.batchSelectAll') : t('workspace.batchSelected', { count: selectedIds.size })}
+            </label>
+            {selectedIds.size > 0 && (
+              <>
+                <div style={{ width: 1, height: 16, background: 'var(--line-2)' }} />
+                <button
+                  className="btn btn-sm admin-btn-danger-ghost"
+                  onClick={() => void handleBatchDelete()}
+                  disabled={batchDeleting}
+                  style={{ fontSize: 12 }}
+                >
+                  {batchDeleting ? t('common.loading') : `${t('common.delete')} (${selectedIds.size})`}
+                </button>
+                <button
+                  className="btn btn-sm btn-ghost"
+                  onClick={() => void handleBatchExport()}
+                  disabled={batchExporting}
+                  style={{ fontSize: 12 }}
+                >
+                  {batchExporting ? t('common.loading') : `${t('workspace.export')} (${selectedIds.size})`}
+                </button>
+                <div style={{ position: 'relative' }}>
+                  <button
+                    className="btn btn-sm btn-ghost"
+                    onClick={() => setBatchMoveOpen((v) => !v)}
+                    disabled={batchMoving}
+                    style={{ fontSize: 12 }}
+                  >
+                    {batchMoving ? t('common.loading') : `${t('workspace.moveTo')} (${selectedIds.size})`}
+                  </button>
+                  {batchMoveOpen && (
+                    <div
+                      style={{
+                        position: 'absolute',
+                        left: 0,
+                        top: 'calc(100% + 4px)',
+                        zIndex: 10,
+                        minWidth: 180,
+                        background: 'var(--paper)',
+                        border: '1px solid var(--line-2)',
+                        borderRadius: 8,
+                        boxShadow: 'var(--shadow-md)',
+                        padding: '6px 0',
+                      }}
+                    >
+                      <button
+                        className="user-menu-item"
+                        style={{ fontSize: 13 }}
+                        onClick={() => void handleBatchMove(null)}
+                      >
+                        {t('workspace.uncategorized')}
+                      </button>
+                      {collections.map((col) => (
+                        <button
+                          key={col.id}
+                          className="user-menu-item"
+                          style={{ fontSize: 13 }}
+                          onClick={() => void handleBatchMove(col.id)}
+                        >
+                          {col.name}
+                        </button>
+                      ))}
+                    </div>
+                  )}
+                </div>
+              </>
+            )}
+          </div>
+        )}
+
+        {error && (
+          <div className="workspace-alert workspace-alert-error">
+            <span>{error}</span>
+            <button onClick={() => setError(null)} className="workspace-alert-close">×</button>
+          </div>
+        )}
+
+        {loading ? (
+          <div className="workspace-empty">{t('common.loading')}</div>
+        ) : filteredExams.length === 0 ? (
+          <div className="workspace-empty">
+            <div className="workspace-empty-icon">◇</div>
+            <div className="workspace-empty-title">
+              {searchQuery || activeFilter !== 'all' ? t('workspace.noSearchResults') : t('workspace.noSavedExams')}
+            </div>
+            <div className="workspace-empty-desc">
+              {searchQuery || activeFilter !== 'all' ? t('workspace.noSearchResultsDesc') : t('workspace.noSavedExamsDesc')}
+            </div>
+            {!searchQuery && activeFilter === 'all' && (
+              <button className="btn btn-primary" onClick={createNewExam} style={{ marginTop: 16 }}>
+                {t('workspace.createFirstExam')}
+              </button>
+            )}
+          </div>
+        ) : (
+          <div className="workspace-list">
+            {filteredExams.map((exam) => {
+              const tags = parseTags(exam.tags)
+              return (
+                <div key={exam.id} className={`workspace-card${exam.is_favorite ? ' workspace-card-favorite' : ''}`}>
+                  <div className="workspace-card-body">
+                    <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
+                      <input
+                        type="checkbox"
+                        checked={selectedIds.has(exam.id)}
+                        onChange={() => toggleSelect(exam.id)}
+                        style={{ cursor: 'pointer' }}
+                      />
+                      <button
+                        className="btn btn-ghost btn-sm"
+                        onClick={() => void handleFavorite(exam.id, !exam.is_favorite)}
+                        title={exam.is_favorite ? t('workspace.unpin') : t('workspace.pin')}
+                        style={{ fontSize: 16, padding: '2px 6px', lineHeight: 1 }}
+                      >
+                        {exam.is_favorite ? '★' : '☆'}
+                      </button>
+                      <div className="workspace-card-title">{exam.title}</div>
+                    </div>
+                    {exam.subtitle && (
+                      <div className="workspace-card-sub">{exam.subtitle}</div>
+                    )}
+                    <div className="workspace-card-meta">
+                      <span>{exam.question_count} {exam.question_count === 1 ? t('common.question') : t('common.questions')}</span>
+                      <span>·</span>
+                      <span>{t('workspace.updated')} {formatDate(exam.updated_at)}</span>
+                    </div>
+                    {tags.length > 0 && (
+                      <div style={{ display: 'flex', gap: 6, marginTop: 6, flexWrap: 'wrap' }}>
+                        {tags.map((tag) => (
+                          <span
+                            key={tag}
+                            style={{
+                              fontSize: 11,
+                              padding: '2px 8px',
+                              borderRadius: 4,
+                              background: 'var(--paper)',
+                              color: 'var(--ink-3)',
+                              border: '1px solid var(--line-2)',
+                            }}
+                          >
+                            {tag}
+                          </span>
+                        ))}
+                      </div>
+                    )}
+                  </div>
+                  <div className="workspace-card-actions">
+                    <button
+                      className="btn btn-primary btn-sm"
+                      onClick={() => void startExam(exam.id)}
+                      disabled={startingId === exam.id}
+                    >
+                      {startingId === exam.id ? t('common.loading') : t('workspace.takeExam')}
+                    </button>
+                    <button
+                      className="btn btn-sm"
+                      onClick={() => navigate(`/exam-editor/${exam.id}`)}
+                      disabled={startingId === exam.id}
+                    >
+                      {t('common.edit')}
+                    </button>
+                    <button
+                      className="btn btn-sm"
+                      onClick={() => void handleDuplicate(exam.id)}
+                      disabled={duplicatingId === exam.id}
+                      title={t('workspace.duplicate')}
+                    >
+                      {duplicatingId === exam.id ? t('common.loading') : t('workspace.duplicate')}
+                    </button>
+                    <button
+                      className="btn btn-sm"
+                      onClick={() => void handleExport(exam.id, exam.title)}
+                      disabled={exportingId === exam.id}
+                      title={t('workspace.export')}
+                    >
+                      {exportingId === exam.id ? t('common.loading') : '↓'}
+                    </button>
+                    {/* Move to collection dropdown */}
+                    <div style={{ position: 'relative' }}>
+                      <button
+                        className="btn btn-sm"
+                        onClick={() => setMoveMenuExamId((id) => (id === exam.id ? null : exam.id))}
+                        disabled={movingExamId === exam.id}
+                        title={t('workspace.moveTo')}
+                      >
+                        {movingExamId === exam.id ? t('common.loading') : '▤'}
+                      </button>
+                      {moveMenuExamId === exam.id && (
+                        <div
+                          style={{
+                            position: 'absolute',
+                            right: 0,
+                            top: 'calc(100% + 4px)',
+                            zIndex: 10,
+                            minWidth: 180,
+                            background: 'var(--paper)',
+                            border: '1px solid var(--line-2)',
+                            borderRadius: 8,
+                            boxShadow: 'var(--shadow-md)',
+                            padding: '6px 0',
+                          }}
+                        >
+                          {exam.collection_id !== null && (
+                            <button
+                              className="user-menu-item"
+                              style={{ fontSize: 13 }}
+                              onClick={() => void handleMoveExam(exam.id, null)}
+                            >
+                              {t('workspace.removeFromCollection')}
+                            </button>
+                          )}
+                          {collections.map((col) => (
+                            col.id !== exam.collection_id && (
+                              <button
+                                key={col.id}
+                                className="user-menu-item"
+                                style={{ fontSize: 13 }}
+                                onClick={() => void handleMoveExam(exam.id, col.id)}
+                              >
+                                {col.name}
+                              </button>
+                            )
+                          ))}
+                          {collections.length === 0 && exam.collection_id === null && (
+                            <div className="user-menu-item" style={{ fontSize: 13, color: 'var(--ink-3)', cursor: 'default' }}>
+                              {t('workspace.noSavedExams')}
+                            </div>
+                          )}
+                        </div>
+                      )}
+                    </div>
+                    <div style={{ position: 'relative' }}>
+                      <button
+                        className="btn btn-sm"
+                        onClick={() => setShareOpenId((id) => (id === exam.id ? null : exam.id))}
+                        disabled={startingId === exam.id || sharingId === exam.id}
+                        title={exam.share_token ? t('share.shared') : t('share.share')}
+                      >
+                        {sharingId === exam.id ? t('common.loading') : (exam.share_token ? t('share.shared') : t('share.share'))}
+                      </button>
+                      {shareOpenId === exam.id && (
+                        <div
+                          style={{
+                            position: 'absolute',
+                            right: 0,
+                            top: 'calc(100% + 4px)',
+                            zIndex: 10,
+                            minWidth: 180,
+                            background: 'var(--paper)',
+                            border: '1px solid var(--line-2)',
+                            borderRadius: 8,
+                            boxShadow: 'var(--shadow-md)',
+                            padding: '6px 0',
+                          }}
+                        >
+                          {exam.share_token ? (
+                            <>
+                              <button
+                                className="user-menu-item"
+                                style={{ fontSize: 13 }}
+                                onClick={() => {
+                                  const url = `${window.location.origin}/share/${exam.share_token}`
+                                  void navigator.clipboard.writeText(url)
+                                  setShareOpenId(null)
+                                }}
+                              >
+                                {t('share.copyLink')}
+                              </button>
+                              <button
+                                className="user-menu-item"
+                                style={{ fontSize: 13, color: 'var(--wrong)' }}
+                                onClick={() => void handleUnshare(exam.id)}
+                              >
+                                {t('share.revokeLink')}
+                              </button>
+                            </>
+                          ) : (
+                            <button
+                              className="user-menu-item"
+                              style={{ fontSize: 13 }}
+                              onClick={() => void handleShare(exam.id)}
+                            >
+                              {t('share.generateLink')}
+                            </button>
+                          )}
+                        </div>
+                      )}
+                    </div>
+                    {deleteConfirm === exam.id ? (
+                      <div className="workspace-delete-confirm">
+                        <button className="btn btn-sm admin-btn-danger" onClick={() => void deleteExam(exam.id)}>
+                          {t('common.confirm')}
+                        </button>
+                        <button className="btn btn-ghost btn-sm" onClick={() => setDeleteConfirm(null)}>
+                          {t('common.cancel')}
+                        </button>
+                      </div>
+                    ) : (
+                      <button
+                        className="btn btn-ghost btn-sm admin-btn-danger-ghost"
+                        onClick={() => setDeleteConfirm(exam.id)}
+                        title={t('common.delete')}
+                        disabled={startingId === exam.id}
+                      >
+                        ✕
+                      </button>
+                    )}
+                  </div>
+                </div>
+              )
+            })}
+          </div>
+        )}
+      </div>
     </div>
   )
 }

frontend/src/components/Overview.tsx

@@ -0,0 +1,336 @@
+import { useState, useRef, useEffect } from 'react'
+import { useNavigate } from 'react-router-dom'
+import { useTranslation } from 'react-i18next'
+import { useAuth } from '../contexts/AuthContext'
+import * as resultApi from '../api/resultApi'
+import * as examApi from '../api/examApi'
+import { loadState } from '../utils/storage'
+import { validateExam, parseExam } from '../utils/validation'
+import type { Exam } from '../types'
+import StudyCoach from './StudyCoach'
+
+interface Props {
+  examCount: number
+  resultCount: number
+  recentResults: resultApi.ResultListItem[]
+  onLoadExam: (exam: Exam, saveToWorkspace?: boolean, examId?: number | null) => void
+}
+
+export default function Overview({ examCount, resultCount, recentResults, onLoadExam }: Props) {
+  const { t } = useTranslation()
+  const navigate = useNavigate()
+  const { user } = useAuth()
+  const [dragOver, setDragOver] = useState(false)
+  const [uploadErr, setUploadErr] = useState<string | null>(null)
+  const fileRef = useRef<HTMLInputElement>(null)
+  const [trends, setTrends] = useState<resultApi.ScoreTrend[]>([])
+  const [trendsLoading, setTrendsLoading] = useState(true)
+
+  useEffect(() => {
+    resultApi.getScoreTrends()
+      .then((data) => setTrends(data))
+      .catch(() => {/* ignore */})
+      .finally(() => setTrendsLoading(false))
+  }, [])
+
+  const handleFile = async (file: File) => {
+    setUploadErr(null)
+    try {
+      const text = await file.text()
+      const data = JSON.parse(text) as unknown
+      const msg = validateExam(data)
+      if (msg) throw new Error(msg)
+      onLoadExam(parseExam(data), true)
+    } catch (e) {
+      setUploadErr(t('landing.loadError', { message: (e as Error).message }))
+    }
+  }
+
+  const [importUrl, setImportUrl] = useState('')
+  const [importing, setImporting] = useState(false)
+
+  const handleImportUrl = async () => {
+    if (!importUrl.trim()) return
+    setUploadErr(null)
+    setImporting(true)
+    try {
+      const res = await fetch(importUrl.trim())
+      if (!res.ok) throw new Error(`HTTP ${res.status}`)
+      const data = await res.json() as unknown
+      const msg = validateExam(data)
+      if (msg) throw new Error(msg)
+      onLoadExam(parseExam(data), true)
+      setImportUrl('')
+    } catch (e) {
+      setUploadErr(t('landing.loadError', { message: (e as Error).message }))
+    } finally {
+      setImporting(false)
+    }
+  }
+
+  const handleRetakeWeakest = async (examId: number) => {
+    try {
+      const exam = await examApi.getExam(examId)
+      onLoadExam(exam, false, examId)
+    } catch {
+      setUploadErr(t('landing.loadError', { message: 'Could not load exam' }))
+    }
+  }
+
+  const resumable = loadState()
+  const totalQuestions = recentResults.reduce((sum, r) => sum + (r.graded_count || 0), 0)
+  const avgScore = recentResults.length > 0
+    ? Math.round(recentResults.reduce((sum, r) => sum + (r.total_points ? (r.score_points / r.total_points) * 100 : 0), 0) / recentResults.length)
+    : 0
+
+  // SVG chart dimensions
+  const margin = { top: 10, right: 20, bottom: 30, left: 40 }
+  const viewW = 520
+  const viewH = 200
+  const cw = viewW - margin.left - margin.right
+  const ch = viewH - margin.top - margin.bottom
+
+  const chartData = trends.slice(-20)
+  const hasChartData = chartData.length >= 2
+
+  const xMin = chartData.length ? chartData[0].completed_at : 0
+  const xMax = chartData.length ? chartData[chartData.length - 1].completed_at : 0
+  const xRange = xMax - xMin || 1
+
+  const xScale = (v: number) => margin.left + ((v - xMin) / xRange) * cw
+  const yScale = (v: number) => margin.top + ch - (v / 100) * ch
+
+  const linePoints = chartData.map((d, i) => {
+    const x = xScale(d.completed_at)
+    const y = yScale(d.score_pct)
+    return `${i === 0 ? 'M' : 'L'} ${x} ${y}`
+  }).join(' ')
+
+  const gridLines = [0, 25, 50, 75, 100].map((pct) => ({
+    y: yScale(pct),
+    label: `${pct}%`,
+  }))
+
+  const xLabelIndices = [...new Set([0, Math.floor(chartData.length / 2), chartData.length - 1])]
+
+  return (
+    <div className="workspace-section fade-in">
+      {/* Dashboard Stats */}
+      <div style={{ display: 'grid', gridTemplateColumns: 'repeat(auto-fit, minmax(140px, 1fr))', gap: 12, marginBottom: 24 }}>
+        <div className="workspace-card" style={{ padding: 16, textAlign: 'center' }}>
+          <div className="mono" style={{ fontSize: 24, fontWeight: 700 }}>{examCount}</div>
+          <div style={{ fontSize: 12, color: 'var(--ink-3)', marginTop: 4 }}>{t('workspace.myExams')}</div>
+        </div>
+        <div className="workspace-card" style={{ padding: 16, textAlign: 'center' }}>
+          <div className="mono" style={{ fontSize: 24, fontWeight: 700 }}>{resultCount}</div>
+          <div style={{ fontSize: 12, color: 'var(--ink-3)', marginTop: 4 }}>{t('workspace.totalAttempts')}</div>
+        </div>
+        <div className="workspace-card" style={{ padding: 16, textAlign: 'center' }}>
+          <div className="mono" style={{ fontSize: 24, fontWeight: 700 }}>{avgScore}%</div>
+          <div style={{ fontSize: 12, color: 'var(--ink-3)', marginTop: 4 }}>{t('workspace.avgScore')}</div>
+        </div>
+        <div className="workspace-card" style={{ padding: 16, textAlign: 'center' }}>
+          <div className="mono" style={{ fontSize: 24, fontWeight: 700 }}>{totalQuestions}</div>
+          <div style={{ fontSize: 12, color: 'var(--ink-3)', marginTop: 4 }}>{t('workspace.questionsAnswered')}</div>
+        </div>
+      </div>
+
+      {/* Quick Actions */}
+      <div style={{ display: 'flex', gap: 12, marginBottom: 24, flexWrap: 'wrap' }}>
+        <button
+          type="button"
+          className={`dropzone${dragOver ? ' drag-over' : ''}`}
+          style={{ flex: 1, minWidth: 220, padding: 16 }}
+          onClick={() => fileRef.current?.click()}
+          onDragOver={(e) => { e.preventDefault(); setDragOver(true) }}
+          onDragLeave={() => setDragOver(false)}
+          onDrop={(e) => {
+            e.preventDefault(); setDragOver(false)
+            const f = e.dataTransfer.files?.[0]
+            if (f) void handleFile(f)
+          }}
+        >
+          <div className="dropzone-icon" style={{ marginBottom: 6 }}>
+            <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+              <path d="M12 3v12M7 8l5-5 5 5M5 21h14" />
+            </svg>
+          </div>
+          <div style={{ fontSize: 13, fontWeight: 500 }}>{t('workspace.uploadExam')}</div>
+          <div style={{ fontSize: 11, color: 'var(--ink-3)', marginTop: 2 }}>{t('workspace.uploadDropzone')}</div>
+          <input
+            ref={fileRef}
+            type="file"
+            accept="application/json,.json"
+            style={{ display: 'none' }}
+            onChange={(e) => { const f = e.target.files?.[0]; if (f) void handleFile(f) }}
+          />
+        </button>
+
+        <div
+          className="workspace-card"
+          style={{ flex: 1, minWidth: 220, padding: 16, display: 'flex', flexDirection: 'column', gap: 8 }}
+        >
+          <div style={{ fontSize: 13, fontWeight: 500 }}>{t('workspace.importFromUrl')}</div>
+          <div style={{ display: 'flex', gap: 8 }}>
+            <input
+              type="text"
+              className="input"
+              placeholder={t('workspace.importUrlPlaceholder')}
+              value={importUrl}
+              onChange={(e) => setImportUrl(e.target.value)}
+              style={{ fontSize: 12, padding: '4px 8px', flex: 1 }}
+            />
+            <button
+              className="btn btn-primary btn-sm"
+              onClick={() => void handleImportUrl()}
+              disabled={importing || !importUrl.trim()}
+              style={{ fontSize: 12 }}
+            >
+              {importing ? t('workspace.importing') : t('workspace.import')}
+            </button>
+          </div>
+        </div>
+
+        <button
+          className="workspace-card"
+          style={{ flex: 1, minWidth: 220, padding: 16, display: 'flex', flexDirection: 'column', alignItems: 'center', justifyContent: 'center', cursor: 'pointer', background: 'var(--paper-2)' }}
+          onClick={() => navigate('/exam-editor/new')}
+        >
+          <div style={{ fontSize: 20, marginBottom: 6 }}>+</div>
+          <div style={{ fontSize: 13, fontWeight: 500 }}>{t('workspace.newExam')}</div>
+          <div style={{ fontSize: 11, color: 'var(--ink-3)', marginTop: 2 }}>{t('workspace.createFirstExam')}</div>
+        </button>
+
+        {resumable && (
+          <button
+            className="workspace-card"
+            style={{ flex: 1, minWidth: 220, padding: 16, display: 'flex', flexDirection: 'column', alignItems: 'center', justifyContent: 'center', cursor: 'pointer', background: 'var(--paper-2)', borderColor: 'var(--accent)' }}
+            onClick={() => onLoadExam(resumable.exam, false, null)}
+          >
+            <div style={{ fontSize: 20, marginBottom: 6 }}>▶</div>
+            <div style={{ fontSize: 13, fontWeight: 500 }}>{t('landing.resumeTitle')}</div>
+            <div style={{ fontSize: 11, color: 'var(--ink-3)', marginTop: 2 }}>
+              {resumable.exam.title}
+            </div>
+          </button>
+        )}
+      </div>
+
+      {uploadErr && (
+        <div style={{ marginBottom: 16, padding: '10px 14px', border: '1px solid var(--wrong)', borderRadius: 8, background: 'var(--wrong-weak)', color: 'var(--wrong)', fontSize: 13 }}>
+          {uploadErr}
+        </div>
+      )}
+
+      {/* Study Coach */}
+      <StudyCoach onRetakeWeakest={handleRetakeWeakest} />
+
+      {/* Performance Trends */}
+      {hasChartData && !trendsLoading && (
+        <div className="workspace-card" style={{ marginBottom: 24 }}>
+          <div style={{ padding: '16px 20px 4px' }}>
+            <h3 style={{ margin: '0 0 12px', fontSize: 15, fontWeight: 600 }}>{t('workspace.performanceTrends')}</h3>
+            <svg viewBox={`0 0 ${viewW} ${viewH}`} style={{ width: '100%', height: 'auto', overflow: 'visible' }}>
+              {/* Grid lines */}
+              {gridLines.map((g) => (
+                <g key={g.label}>
+                  <line
+                    x1={margin.left}
+                    x2={margin.left + cw}
+                    y1={g.y}
+                    y2={g.y}
+                    stroke="var(--line-2)"
+                    strokeDasharray="2,2"
+                    strokeWidth={1}
+                  />
+                  <text x={margin.left - 6} y={g.y + 3} textAnchor="end" fontSize={10} fill="var(--ink-3)">
+                    {g.label}
+                  </text>
+                </g>
+              ))}
+              {/* Trend line */}
+              <path
+                d={linePoints}
+                fill="none"
+                stroke="var(--accent)"
+                strokeWidth={2}
+                strokeLinecap="round"
+                strokeLinejoin="round"
+              />
+              {/* Data points */}
+              {chartData.map((d, i) => {
+                const x = xScale(d.completed_at)
+                const y = yScale(d.score_pct)
+                const date = new Date(d.completed_at * 1000).toLocaleDateString(undefined, { month: 'short', day: 'numeric' })
+                return (
+                  <g key={i}>
+                    <circle
+                      cx={x}
+                      cy={y}
+                      r={4}
+                      fill="var(--accent)"
+                      stroke="var(--paper-2)"
+                      strokeWidth={2}
+                    >
+                      <title>{`${d.title} — ${d.score_pct}% (${date})`}</title>
+                    </circle>
+                  </g>
+                )
+              })}
+              {/* X-axis labels */}
+              {xLabelIndices.map((idx) => {
+                const d = chartData[idx]
+                if (!d) return null
+                const x = xScale(d.completed_at)
+                const date = new Date(d.completed_at * 1000).toLocaleDateString(undefined, { month: 'short', day: 'numeric' })
+                return (
+                  <text key={idx} x={x} y={viewH - 6} textAnchor="middle" fontSize={10} fill="var(--ink-3)">
+                    {date}
+                  </text>
+                )
+              })}
+            </svg>
+          </div>
+        </div>
+      )}
+
+      {/* Recent Results */}
+      {recentResults.length > 0 && (
+        <div style={{ marginBottom: 24 }}>
+          <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'baseline', marginBottom: 12 }}>
+            <h3 style={{ margin: 0, fontSize: 15, fontWeight: 600 }}>{t('workspace.recentResults')}</h3>
+            <button className="btn btn-ghost btn-sm" onClick={() => navigate('/workspace/results')}>
+              {t('workspace.viewAll')} →
+            </button>
+          </div>
+          <div className="workspace-list">
+            {recentResults.map((r) => {
+              const pct = r.total_points ? Math.round((r.score_points / r.total_points) * 100) : 0
+              const passed = pct >= (r.passing_score ?? 60)
+              const d = new Date(r.completed_at * 1000)
+              const dateStr = d.toLocaleDateString('en-US', { month: 'short', day: 'numeric' })
+              return (
+                <div key={r.id} className="workspace-card" style={{ display: 'flex', alignItems: 'center', gap: 12, padding: 12 }}>
+                  <div style={{ flex: 1 }}>
+                    <div style={{ fontSize: 13, fontWeight: 500 }}>{r.title}</div>
+                    <div className="muted" style={{ fontSize: 11 }}>{dateStr}</div>
+                  </div>
+                  <div className={`score-pill ${passed ? 'pass' : 'fail'}`} style={{ fontSize: 11 }}>{pct}%</div>
+                </div>
+              )
+            })}
+          </div>
+        </div>
+      )}
+
+      {!user && (
+        <div className="workspace-card" style={{ padding: 20, textAlign: 'center' }}>
+          <div style={{ fontSize: 14, marginBottom: 8 }}>{t('workspace.signInPrompt')}</div>
+          <button className="btn btn-primary" onClick={() => { /* handled by parent */ }}>
+            {t('auth.signIn')}
+          </button>
+        </div>
+      )}
+    </div>
+  )
+}

frontend/src/components/ShareView.tsx

@@ -0,0 +1,117 @@
+import { useState, useEffect } from 'react'
+import { useParams, useNavigate } from 'react-router-dom'
+import { useTranslation } from 'react-i18next'
+import { useAuth } from '../contexts/AuthContext'
+import * as examApi from '../api/examApi'
+import type { Exam } from '../types'
+
+export default function ShareView({ onLoadExam }: { onLoadExam: (exam: Exam, saveToWorkspace?: boolean, examId?: number | null) => void }) {
+  const { t } = useTranslation()
+  const { token } = useParams<{ token: string }>()
+  const navigate = useNavigate()
+  const { user } = useAuth()
+  const [loading, setLoading] = useState(true)
+  const [error, setError] = useState<string | null>(null)
+  const [data, setData] = useState<{ title: string; subtitle: string | null; questionCount: number; exam: Exam; shareMode: string } | null>(null)
+  const [cloning, setCloning] = useState(false)
+
+  useEffect(() => {
+    if (!token) {
+      setError('Invalid link')
+      setLoading(false)
+      return
+    }
+    examApi.getSharedExam(token)
+      .then((res) => {
+        setData({
+          title: res.title,
+          subtitle: res.subtitle,
+          questionCount: res.questionCount,
+          exam: res.exam as Exam,
+          shareMode: res.shareMode ?? 'clone',
+        })
+        setLoading(false)
+      })
+      .catch((e) => {
+        setError((e as Error).message)
+        setLoading(false)
+      })
+  }, [token])
+
+  const handleTake = () => {
+    if (!data) return
+    onLoadExam(data.exam, false, null)
+  }
+
+  const handleClone = async () => {
+    if (!token || !data) return
+    if (!user) {
+      navigate('/')
+      return
+    }
+    setCloning(true)
+    try {
+      await examApi.cloneSharedExam(token)
+      navigate('/workspace/exams')
+    } catch (e) {
+      setError((e as Error).message)
+      setCloning(false)
+    }
+  }
+
+  if (loading) {
+    return (
+      <div className="shell">
+        <div className="workspace-empty">{t('common.loading')}</div>
+      </div>
+    )
+  }
+
+  if (error || !data) {
+    return (
+      <div className="shell">
+        <div className="workspace-empty">
+          <div className="workspace-empty-icon">!</div>
+          <div className="workspace-empty-title">{error || 'Not found'}</div>
+          <button className="btn btn-primary" onClick={() => navigate('/')} style={{ marginTop: 16 }}>
+            {t('results.backToHome')}
+          </button>
+        </div>
+      </div>
+    )
+  }
+
+  return (
+    <div className="shell">
+      <div className="landing" style={{ maxWidth: 640, margin: '0 auto', paddingTop: 40 }}>
+        <div className="landing-eyebrow">{t('common.appName')}</div>
+        <h1 className="landing-title">{data.title}</h1>
+        {data.subtitle && <p className="landing-sub">{data.subtitle}</p>}
+
+        <div style={{ marginTop: 24, padding: 20, border: '1px solid var(--line-2)', borderRadius: 12, background: 'var(--paper-2)' }}>
+          <div style={{ fontSize: 14, marginBottom: 8 }}>
+            <span className="mono" style={{ color: 'var(--ink-3)' }}>{data.questionCount}</span> {data.questionCount === 1 ? t('common.question') : t('common.questions')}
+          </div>
+          <div style={{ display: 'flex', gap: 12, marginTop: 16 }}>
+            <button className="btn btn-primary" onClick={handleTake}>
+              {t('share.takeExam')}
+            </button>
+            {user && data.shareMode !== 'view' ? (
+              <button className="btn btn-ghost" onClick={() => void handleClone()} disabled={cloning}>
+                {cloning ? t('common.loading') : t('share.saveToWorkspace')}
+              </button>
+            ) : user ? (
+              <span className="muted" style={{ fontSize: 12, alignSelf: 'center' }}>
+                {t('workspace.shareModeView')}
+              </span>
+            ) : (
+              <button className="btn btn-ghost" onClick={() => navigate('/')}>
+                {t('auth.signIn')} →
+              </button>
+            )}
+          </div>
+        </div>
+      </div>
+    </div>
+  )
+}

frontend/src/components/SharedWithMe.tsx

@@ -0,0 +1,92 @@
+import { useState, useEffect, useCallback } from 'react'
+import { useNavigate } from 'react-router-dom'
+import { useTranslation } from 'react-i18next'
+import * as examApi from '../api/examApi'
+import type { Exam } from '../types'
+
+interface Props {
+  onLoadExam: (exam: Exam, saveToWorkspace?: boolean, examId?: number | null) => void
+}
+
+export default function SharedWithMe({ onLoadExam }: Props) {
+  const { t } = useTranslation()
+  const navigate = useNavigate()
+  const [exams, setExams] = useState<examApi.ClonedExamItem[]>([])
+  const [loading, setLoading] = useState(true)
+
+  const load = useCallback(async () => {
+    setLoading(true)
+    try {
+      const data = await examApi.listClonedExams()
+      setExams(data)
+    } catch {
+      setExams([])
+    } finally {
+      setLoading(false)
+    }
+  }, [])
+
+  useEffect(() => {
+    void load()
+  }, [load])
+
+  if (loading) {
+    return (
+      <div className="workspace-section">
+        <div className="workspace-empty" style={{ padding: 40 }}>{t('common.loading')}</div>
+      </div>
+    )
+  }
+
+  if (exams.length === 0) {
+    return (
+      <div className="workspace-section fade-in">
+        <h2 style={{ margin: '0 0 16px', fontSize: 18, fontWeight: 600 }}>{t('workspace.sharedWithMe')}</h2>
+        <div className="workspace-empty" style={{ padding: 40 }}>
+          <div className="workspace-empty-icon">
+            <svg width="40" height="40" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round">
+              <path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71" />
+              <path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71" />
+            </svg>
+          </div>
+          <div className="workspace-empty-title">{t('workspace.noSharedExams')}</div>
+          <div className="workspace-empty-desc">{t('workspace.noSharedExamsDesc')}</div>
+        </div>
+      </div>
+    )
+  }
+
+  return (
+    <div className="workspace-section fade-in">
+      <h2 style={{ margin: '0 0 16px', fontSize: 18, fontWeight: 600 }}>{t('workspace.sharedWithMe')}</h2>
+      <div className="workspace-list" style={{ display: 'flex', flexDirection: 'column', gap: 12 }}>
+        {exams.map((exam) => (
+          <div
+            key={exam.id}
+            className="workspace-card"
+            style={{ padding: 16, display: 'flex', alignItems: 'center', gap: 12, cursor: 'pointer' }}
+            onClick={() => {
+              void examApi.getExam(exam.id).then((e) => onLoadExam(e, false, exam.id))
+            }}
+          >
+            <div style={{ flex: 1 }}>
+              <div style={{ fontSize: 14, fontWeight: 500 }}>{exam.title}</div>
+              <div className="muted" style={{ fontSize: 12, marginTop: 2 }}>
+                {exam.question_count} {exam.question_count === 1 ? t('common.question') : t('common.questions')}
+              </div>
+            </div>
+            <button
+              className="btn btn-sm"
+              onClick={(ev) => {
+                ev.stopPropagation()
+                navigate(`/exam-editor/${exam.id}`)
+              }}
+            >
+              {t('common.edit')}
+            </button>
+          </div>
+        ))}
+      </div>
+    </div>
+  )
+}

frontend/src/components/StudyCoach.tsx

@@ -0,0 +1,106 @@
+import { useState, useEffect } from 'react'
+import { useTranslation } from 'react-i18next'
+import { useNavigate } from 'react-router-dom'
+import * as resultApi from '../api/resultApi'
+
+interface Props {
+  onRetakeWeakest?: (examId: number) => void
+}
+
+export default function StudyCoach({ onRetakeWeakest }: Props) {
+  const { t } = useTranslation()
+  const navigate = useNavigate()
+  const [data, setData] = useState<resultApi.StudyCoachResult | null>(null)
+  const [loading, setLoading] = useState(true)
+
+  useEffect(() => {
+    resultApi.analyzeResults()
+      .then((res) => setData(res))
+      .catch(() => {/* ignore */})
+      .finally(() => setLoading(false))
+  }, [])
+
+  if (loading) {
+    return (
+      <div className="workspace-card" style={{ marginBottom: 24 }}>
+        <div className="workspace-empty" style={{ padding: 24 }}>{t('common.loading')}</div>
+      </div>
+    )
+  }
+
+  if (!data || (data.weakAreas.length === 0 && data.studyTips.length === 0 && !data.weakestExamId)) {
+    return null
+  }
+
+  return (
+    <div className="workspace-card" style={{ marginBottom: 24, borderLeft: '3px solid var(--accent)' }}>
+      <div style={{ padding: 20 }}>
+        <div style={{ display: 'flex', alignItems: 'center', gap: 8, marginBottom: 12 }}>
+          <span style={{ fontSize: 18 }}>🤖</span>
+          <h3 style={{ margin: 0, fontSize: 15, fontWeight: 600 }}>{t('workspace.studyCoachTitle')}</h3>
+          {data.streakDays > 0 && (
+            <span className="mono" style={{ fontSize: 12, color: 'var(--ink-3)', marginLeft: 'auto' }}>
+              🔥 {data.streakDays} {data.streakDays === 1 ? t('workspace.streakDay') : t('workspace.streakDays')}
+            </span>
+          )}
+        </div>
+
+        {data.weakestExamId && onRetakeWeakest && (
+          <div style={{ marginBottom: 12 }}>
+            <button
+              className="btn btn-sm"
+              style={{ background: 'var(--wrong)', color: 'white', borderColor: 'var(--wrong)' }}
+              onClick={() => onRetakeWeakest(data.weakestExamId!)}
+            >
+              🔄 {t('workspace.retakeWeakest')}
+            </button>
+          </div>
+        )}
+
+        {data.weakAreas.length > 0 && (
+          <div style={{ marginBottom: 12 }}>
+            {data.weakAreas.slice(0, 3).map((area) => (
+              <div key={area.category} style={{ display: 'flex', alignItems: 'center', gap: 10, marginBottom: 8 }}>
+                <div style={{ flex: 1, height: 6, background: 'var(--line-2)', borderRadius: 3, overflow: 'hidden' }}>
+                  <div
+                    style={{
+                      width: `${area.avgScore}%`,
+                      height: '100%',
+                      background: area.avgScore >= 60 ? 'var(--ok)' : 'var(--wrong)',
+                      borderRadius: 3,
+                    }}
+                  />
+                </div>
+                <span className="mono" style={{ fontSize: 12, minWidth: 40, textAlign: 'right' }}>
+                  {area.avgScore}%
+                </span>
+                <span style={{ fontSize: 13, minWidth: 120 }}>{area.category}</span>
+              </div>
+            ))}
+          </div>
+        )}
+
+        {data.studyTips.length > 0 && (
+          <div style={{ padding: 12, background: 'var(--paper)', borderRadius: 8 }}>
+            <div className="mono" style={{ fontSize: 10, textTransform: 'uppercase', letterSpacing: '0.1em', color: 'var(--ink-3)', marginBottom: 8 }}>
+              {t('workspace.studyTips')}
+            </div>
+            <ul style={{ margin: 0, paddingLeft: 18, fontSize: 13, lineHeight: 1.7, color: 'var(--ink-2)' }}>
+              {data.studyTips.map((tip, i) => (
+                <li key={i}>{tip}</li>
+              ))}
+            </ul>
+          </div>
+        )}
+
+        <button
+          className="btn btn-ghost btn-sm"
+          style={{ marginTop: 12 }}
+          onClick={() => navigate('/workspace/results')}
+        >
+          {t('workspace.viewAllResults')} →
+        </button>
+      </div>
+    </div>
+  )
+}

frontend/src/components/Workspace.tsx

@@ -1,4 +1,5 @@
 import { useState, useEffect, useCallback } from 'react'
+import type { ReactNode } from 'react'
 import { useNavigate, useParams, Navigate } from 'react-router-dom'
 import { useTranslation } from 'react-i18next'
 import { useAuth } from '../contexts/AuthContext'
@@ -9,11 +10,24 @@ import MyExams from './MyExams'
 import MyResults from './MyResults'
 import Settings from './Settings'
 import StorageManager from './StorageManager'
+import Overview from './Overview'
+import SharedWithMe from './SharedWithMe'
 
-type TabKey = 'exams' | 'results' | 'storage' | 'settings'
+type TabKey = 'overview' | 'exams' | 'shared' | 'results' | 'storage' | 'settings'
 
-const TAB_KEYS: { key: TabKey; labelKey: string; icon: string }[] = [
+const TAB_KEYS: { key: TabKey; labelKey: string; icon: ReactNode }[] = [
+  { key: 'overview', labelKey: 'workspace.overview', icon: '◈' },
   { key: 'exams', labelKey: 'workspace.myExams', icon: '◇' },
+  {
+    key: 'shared',
+    labelKey: 'workspace.sharedWithMe',
+    icon: (
+      <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+        <path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71" />
+        <path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71" />
+      </svg>
+    ),
+  },
   { key: 'results', labelKey: 'workspace.results', icon: '✦' },
   { key: 'storage', labelKey: 'workspace.storage', icon: '◉' },
   { key: 'settings', labelKey: 'workspace.settings', icon: '⚙' },
@@ -28,9 +42,10 @@ export default function Workspace({ onLoadExam }: Props) {
   const { user, loading: authLoading } = useAuth()
   const navigate = useNavigate()
   const { tab } = useParams<{ tab: string }>()
-  const activeTab = (tab as TabKey) ?? 'exams'
+  const activeTab = (tab as TabKey) ?? 'overview'
   const [examCount, setExamCount] = useState(0)
   const [resultCount, setResultCount] = useState(0)
+  const [recentResults, setRecentResults] = useState<resultApi.ResultListItem[]>([])
 
   const loadCounts = useCallback(async () => {
     try {
@@ -38,6 +53,7 @@ export default function Workspace({ onLoadExam }: Props) {
       setExamCount(exams.length)
       const results = await resultApi.listResults()
       setResultCount(results.total)
+      setRecentResults(results.results.slice(0, 5))
     } catch {
       // silently ignore
     }
@@ -47,11 +63,11 @@ export default function Workspace({ onLoadExam }: Props) {
     if (user) void loadCounts()
   }, [user, loadCounts])
 
+  const setTab = (key: TabKey) => navigate(`/workspace/${key}`)
+
   if (authLoading) return null
   if (!user) return <Navigate to="/" replace />
 
-  const setTab = (key: TabKey) => navigate(`/workspace/${key}`)
-
   return (
     <div className="workspace-shell">
       <aside className="workspace-sidebar">
@@ -60,7 +76,6 @@ export default function Workspace({ onLoadExam }: Props) {
             {user.displayName.charAt(0).toUpperCase()}
           </div>
           <div className="workspace-name">{user.displayName}</div>
-          <div className="workspace-email">{user.email}</div>
         </div>
 
         <nav className="workspace-nav">
@@ -84,7 +99,16 @@ export default function Workspace({ onLoadExam }: Props) {
       </aside>
 
       <main className="workspace-main">
+        {activeTab === 'overview' && (
+          <Overview
+            examCount={examCount}
+            resultCount={resultCount}
+            recentResults={recentResults}
+            onLoadExam={onLoadExam}
+          />
+        )}
         {activeTab === 'exams' && <MyExams onLoadExam={onLoadExam} />}
+        {activeTab === 'shared' && <SharedWithMe onLoadExam={onLoadExam} />}
         {activeTab === 'results' && <MyResults onLoadExam={onLoadExam} />}
         {activeTab === 'storage' && <StorageManager />}
         {activeTab === 'settings' && <Settings />}

frontend/src/i18n/en.json

@@ -154,6 +154,7 @@
   },
   "workspace": {
     "myWorkspace": "My Workspace",
+    "overview": "Overview",
     "myExams": "My Exams",
     "results": "Results",
     "settings": "Settings",
@@ -162,6 +163,30 @@
     "noSavedExamsDesc": "Upload an exam from the home page, or create a new one to get started.",
     "createFirstExam": "Create Your First Exam",
     "takeExam": "Take exam",
+    "totalAttempts": "Total Attempts",
+    "avgScore": "Avg. Score",
+    "questionsAnswered": "Questions Answered",
+    "uploadExam": "Upload Exam",
+    "uploadDropzone": "Drop JSON or click to browse",
+    "studyCoachTitle": "Study Coach",
+    "streakDay": "day streak",
+    "streakDays": "day streak",
+    "studyTips": "Study Tips",
+    "retakeWeakest": "Retake Weakest Exam",
+    "performanceTrends": "Performance Trends",
+    "sharedWithMe": "Shared with Me",
+    "noSharedExams": "No shared exams yet",
+    "noSharedExamsDesc": "Exams shared by others will appear here when you save them to your workspace.",
+    "shareMode": "Share mode",
+    "shareModeClone": "Cloneable",
+    "shareModeView": "View only",
+    "importFromUrl": "Import from URL",
+    "importUrlPlaceholder": "Paste a raw JSON URL…",
+    "import": "Import",
+    "importing": "Importing…",
+    "viewAllResults": "View all results",
+    "recentResults": "Recent Results",
+    "viewAll": "View all",
     "noAttempts": "No attempts yet",
     "noAttemptsDesc": "Take an exam to see your results here.",
     "attempts": "attempt",
@@ -211,7 +236,27 @@
     "deleteExamConfirm": "Delete this exam? This cannot be undone.",
     "deleteResultConfirm": "Delete this result? This cannot be undone.",
     "storageWarningHigh": "You are using over 80% of your storage.",
-    "storageWarningCritical": "You are using over 95% of your storage. Delete some items to free up space."
+    "storageWarningCritical": "You are using over 95% of your storage. Delete some items to free up space.",
+    "searchExams": "Search exams…",
+    "noSearchResults": "No exams match your search",
+    "noSearchResultsDesc": "Try a different keyword or clear the search.",
+    "pin": "Pin to top",
+    "unpin": "Unpin",
+    "duplicate": "Duplicate",
+    "export": "Export JSON",
+    "collections": "Collections",
+    "newCollection": "New Collection",
+    "allExams": "All Exams",
+    "uncategorized": "Uncategorized",
+    "moveTo": "Move to",
+    "removeFromCollection": "Remove from collection",
+    "collectionNamePlaceholder": "Collection name…",
+    "create": "Create",
+    "rename": "Rename",
+    "deleteCollectionConfirm": "Delete this collection? Exams will be moved to uncategorized.",
+    "batchSelectAll": "Select all",
+    "batchSelected": "{{count}} selected",
+    "batchDeleteConfirm": "Delete selected exams? This cannot be undone."
   },
   "admin": {
     "aiGrading": {
@@ -346,6 +391,9 @@
     "correctOrder": "Correct Order",
     "correctOrderHint": "The correct order is the order shown above. Reorder items to set the correct sequence.",
     "setCurrentOrder": "Set Current Order as Correct",
+    "tagsLabel": "Tags",
+    "tagsPlaceholder": "Add tag…",
+    "addTag": "Add",
     "examTitleRequired": "Exam title is required",
     "atLeastOneQuestion": "Add at least one question",
     "sourceLanguage": "Source Language",
@@ -398,6 +446,15 @@
     "backToHome": "Back to Home",
     "noToken": "No verification token found."
   },
+  "share": {
+    "share": "Share",
+    "shared": "Shared",
+    "generateLink": "Generate share link",
+    "copyLink": "Copy link",
+    "revokeLink": "Revoke link",
+    "takeExam": "Take this exam",
+    "saveToWorkspace": "Save to my workspace"
+  },
   "resetPassword": {
     "resetPassword": "Reset Password",
     "enterEmail": "Enter your email address and we'll send you a link to reset your password.",

frontend/src/i18n/nl.json

@@ -162,6 +162,30 @@
     "noSavedExamsDesc": "Upload een examen vanaf de homepagina, of maak een nieuw examen aan om te beginnen.",
     "createFirstExam": "Maak je eerste examen",
     "takeExam": "Examen maken",
+    "totalAttempts": "Totaal Pogingen",
+    "avgScore": "Gem. Score",
+    "questionsAnswered": "Beantwoorde Vragen",
+    "uploadExam": "Examen Uploaden",
+    "uploadDropzone": "Sleep JSON of klik om te bladeren",
+    "studyCoachTitle": "Study Coach",
+    "streakDay": "dag streak",
+    "streakDays": "dagen streak",
+    "studyTips": "Studietips",
+    "retakeWeakest": "Zwakste Examen Opnieuw",
+    "performanceTrends": "Prestatietrends",
+    "sharedWithMe": "Gedeeld met mij",
+    "noSharedExams": "Nog geen gedeelde examens",
+    "noSharedExamsDesc": "Examens die anderen met je delen, verschijnen hier wanneer je ze opslaat in je werkruimte.",
+    "shareMode": "Deelmodus",
+    "shareModeClone": "Kloonbaar",
+    "shareModeView": "Alleen bekijken",
+    "importFromUrl": "Importeren vanaf URL",
+    "importUrlPlaceholder": "Plak een ruwe JSON-URL…",
+    "import": "Importeren",
+    "importing": "Importeren…",
+    "viewAllResults": "Alle resultaten bekijken",
+    "recentResults": "Recente Resultaten",
+    "viewAll": "Alles bekijken",
     "noAttempts": "Nog geen pogingen",
     "noAttemptsDesc": "Maak een examen om hier je resultaten te zien.",
     "attempts": "poging",
@@ -211,7 +235,27 @@
     "deleteExamConfirm": "Dit examen verwijderen? Dit kan niet ongedaan worden gemaakt.",
     "deleteResultConfirm": "Dit resultaat verwijderen? Dit kan niet ongedaan worden gemaakt.",
     "storageWarningHigh": "Je gebruikt meer dan 80% van je opslag.",
-    "storageWarningCritical": "Je gebruikt meer dan 95% van je opslag. Verwijder enkele items om ruimte vrij te maken."
+    "storageWarningCritical": "Je gebruikt meer dan 95% van je opslag. Verwijder enkele items om ruimte vrij te maken.",
+    "searchExams": "Zoek examens…",
+    "noSearchResults": "Geen examens gevonden",
+    "noSearchResultsDesc": "Probeer een ander trefwoord of wis de zoekopdracht.",
+    "pin": "Vastpinnen",
+    "unpin": "Losmaken",
+    "duplicate": "Dupliceren",
+    "export": "Exporteer JSON",
+    "collections": "Collecties",
+    "newCollection": "Nieuwe Collectie",
+    "allExams": "Alle Examens",
+    "uncategorized": "Niet-gecategoriseerd",
+    "moveTo": "Verplaats naar",
+    "removeFromCollection": "Verwijder uit collectie",
+    "collectionNamePlaceholder": "Collectienaam…",
+    "create": "Aanmaken",
+    "rename": "Hernoemen",
+    "deleteCollectionConfirm": "Deze collectie verwijderen? Examens worden niet-gecategoriseerd.",
+    "batchSelectAll": "Alles selecteren",
+    "batchSelected": "{{count}} geselecteerd",
+    "batchDeleteConfirm": "Geselecteerde examens verwijderen? Dit kan niet ongedaan worden gemaakt."
   },
   "admin": {
     "aiGrading": {
@@ -345,6 +389,9 @@
     "correctOrder": "Correcte volgorde",
     "correctOrderHint": "De correcte volgorde is de volgorde hierboven. Rangschik de items om de juiste volgorde in te stellen.",
     "setCurrentOrder": "Huidige volgorde instellen als correct",
+    "tagsLabel": "Labels",
+    "tagsPlaceholder": "Label toevoegen…",
+    "addTag": "Toevoegen",
     "examTitleRequired": "Examennaam is verplicht",
     "atLeastOneQuestion": "Voeg minimaal één vraag toe",
     "sourceLanguage": "Brontaal",
@@ -397,6 +444,15 @@
     "backToHome": "Terug naar home",
     "noToken": "Geen verificatietoken gevonden."
   },
+  "share": {
+    "share": "Delen",
+    "shared": "Gedeeld",
+    "generateLink": "Deellink genereren",
+    "copyLink": "Link kopiëren",
+    "revokeLink": "Link intrekken",
+    "takeExam": "Dit examen maken",
+    "saveToWorkspace": "Opslaan in mijn werkruimte"
+  },
   "resetPassword": {
     "resetPassword": "Wachtwoord resetten",
     "enterEmail": "Voer je e-mailadres in en we sturen je een link om je wachtwoord te resetten.",

node_modules/.vite/vitest/da39a3ee5e6b4b0d3255bfef95601890afd80709/results.json

@@ -1 +1 @@
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+{"version":"4.1.5","results":[[":frontend/src/utils/grading.test.ts",{"duration":0,"failed":true}],[":backend/dist/validators/resultSchemas.test.js",{"duration":0,"failed":true}],[":backend/src/validators/authSchemas.test.ts",{"duration":0,"failed":true}],[":backend/src/validators/resultSchemas.test.ts",{"duration":0,"failed":true}],[":backend/dist/validators/authSchemas.test.js",{"duration":0,"failed":true}],[":frontend/src/utils/storage.test.ts",{"duration":0,"failed":true}],[":backend/dist/validators/examSchemas.test.js",{"duration":0,"failed":true}],[":backend/dist/config.test.js",{"duration":0,"failed":true}],[":backend/src/validators/adminSchemas.test.ts",{"duration":0,"failed":true}],[":frontend/src/utils/latex.test.ts",{"duration":0,"failed":true}],[":backend/dist/validators/adminSchemas.test.js",{"duration":0,"failed":true}],[":backend/src/config.test.ts",{"duration":0,"failed":true}],[":backend/src/validators/examSchemas.test.ts",{"duration":0,"failed":true}],[":backend/dist/utils/tokens.test.js",{"duration":0,"failed":true}],[":frontend/src/utils/validation.test.ts",{"duration":0,"failed":true}],[":backend/src/utils/tokens.test.ts",{"duration":0,"failed":true}],[":frontend/src/utils/slug.test.ts",{"duration":0,"failed":true}],[":backend/src/utils/asyncHandler.test.ts",{"duration":0,"failed":true}],[":backend/src/validators/setupSchemas.test.ts",{"duration":0,"failed":true}],[":backend/dist/validators/setupSchemas.test.js",{"duration":0,"failed":true}],[":backend/dist/middleware/error.test.js",{"duration":0,"failed":true}],[":backend/dist/utils/asyncHandler.test.js",{"duration":0,"failed":true}],[":frontend/src/utils/formatting.test.ts",{"duration":0,"failed":true}],[":backend/src/middleware/error.test.ts",{"duration":0,"failed":true}],[":frontend/src/utils/api.test.ts",{"duration":0,"failed":true}],[":backend/src/repositories/storageRepo.test.ts",{"duration":0,"failed":true}],[":backend/dist/repositories/storageRepo.test.js",{"duration":0,"failed":true}]]}