chore: add katex, dompurify, vitest; copy sample exam files

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-04-21 21:14:29 +02:00
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+{
+  "title": "Mixed Demo — Every Question Type",
+  "subtitle": "A tour of every renderer in the platform",
+  "timeLimitMinutes": null,
+  "feedbackMode": "end",
+  "categories": ["Demo"],
+  "questions": [
+    {
+      "id": "q1",
+      "type": "multiple-choice",
+      "category": "Demo",
+      "points": 1,
+      "prompt": "Which of the following is the capital of Japan?",
+      "image": {
+        "src": "https://images.unsplash.com/photo-1540959733332-eab4deabeeaf?w=800",
+        "alt": "City skyline",
+        "caption": "A city skyline — can you identify it?"
+      },
+      "choices": [
+        { "id": "a", "text": "Kyoto" },
+        { "id": "b", "text": "Osaka" },
+        { "id": "c", "text": "Tokyo" },
+        { "id": "d", "text": "Hiroshima" }
+      ],
+      "answer": "c",
+      "explanation": "Tokyo has been Japan's capital since 1868."
+    },
+    {
+      "id": "q2",
+      "type": "multiple-choice",
+      "category": "Demo",
+      "points": 2,
+      "prompt": "What does the following function return when called with `fib(6)`?",
+      "code": {
+        "language": "javascript",
+        "content": "function fib(n) {\n  if (n < 2) return n;\n  return fib(n - 1) + fib(n - 2);\n}"
+      },
+      "choices": [
+        { "id": "a", "text": "5" },
+        { "id": "b", "text": "8" },
+        { "id": "c", "text": "13" },
+        { "id": "d", "text": "6" }
+      ],
+      "answer": "b",
+      "explanation": "The Fibonacci sequence is 0, 1, 1, 2, 3, 5, 8 — so fib(6) = 8."
+    },
+    {
+      "id": "q3",
+      "type": "short-answer",
+      "category": "Demo",
+      "points": 1,
+      "prompt": "In the data table below, which country had the highest GDP growth?",
+      "table": {
+        "headers": ["Country", "GDP Growth (%)", "Year"],
+        "rows": [
+          ["Vietnam", "7.2", "2024"],
+          ["India", "6.8", "2024"],
+          ["Indonesia", "5.1", "2024"],
+          ["Philippines", "5.9", "2024"]
+        ]
+      },
+      "answer": "Vietnam",
+      "caseSensitive": false
+    },
+    {
+      "id": "q4",
+      "type": "essay",
+      "category": "Demo",
+      "points": 5,
+      "prompt": "Describe a time you solved a difficult problem. What approach did you take?",
+      "minWords": 50,
+      "rubric": [
+        "Specific situation (not generic)",
+        "Clear problem statement",
+        "Described methodology",
+        "Outcome or reflection"
+      ]
+    }
+  ]
+}