feat: remove import URL functionality from Overview component

frontend/src/components/Overview.tsx

@@ -46,28 +46,6 @@ export default function Overview({ examCount, resultCount, recentResults, onLoad
     }
   }
 
-  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)
@@ -166,31 +144,6 @@ export default function Overview({ examCount, resultCount, recentResults, onLoad
           />
         </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)' }}