feat(frontend): lesson progress list with sorting

packages/frontend/src/components/LessonProgressList.tsx

@@ -0,0 +1,79 @@
+import { useMemo, useState } from 'react';
+import { Link } from 'react-router-dom';
+
+export interface LessonProgressRow {
+  lessonId: number;
+  name: string;
+  totalCards: number;
+  masteredCards: number;
+  scorePct: number;
+  lastSessionAt: number | null;
+}
+
+type SortKey = 'name' | 'score' | 'last';
+
+function relativeTime(unixSec: number | null): string {
+  if (!unixSec) return 'nooit';
+  const diff = Math.floor(Date.now() / 1000) - unixSec;
+  if (diff < 60) return 'zojuist';
+  if (diff < 3600) return `${Math.floor(diff / 60)}m geleden`;
+  if (diff < 86400) return `${Math.floor(diff / 3600)}u geleden`;
+  return `${Math.floor(diff / 86400)}d geleden`;
+}
+
+export function LessonProgressList({ rows }: { rows: LessonProgressRow[] }) {
+  const [sortBy, setSortBy] = useState<SortKey>('score');
+
+  const sorted = useMemo(() => {
+    const copy = [...rows];
+    copy.sort((a, b) => {
+      if (sortBy === 'name') return a.name.localeCompare(b.name);
+      if (sortBy === 'last') return (b.lastSessionAt ?? 0) - (a.lastSessionAt ?? 0);
+      return b.scorePct - a.scorePct;
+    });
+    return copy;
+  }, [rows, sortBy]);
+
+  if (rows.length === 0) {
+    return <p className="text-sm text-slate-500">Nog geen lessen.</p>;
+  }
+
+  return (
+    <div>
+      <div className="mb-2 flex gap-1 text-xs">
+        <span className="text-slate-500">Sorteer:</span>
+        {(['score', 'name', 'last'] as SortKey[]).map((k) => (
+          <button
+            key={k}
+            onClick={() => setSortBy(k)}
+            className={`rounded-full px-2 py-0.5 ${
+              sortBy === k
+                ? 'bg-brand-100 text-brand-700 dark:bg-brand-900/40 dark:text-brand-200'
+                : 'text-slate-500 hover:bg-slate-100 dark:hover:bg-slate-800'
+            }`}
+          >
+            {k === 'score' ? 'score' : k === 'name' ? 'naam' : 'laatst'}
+          </button>
+        ))}
+      </div>
+      <ul className="surface divide-y divide-brand-100/60 dark:divide-slate-800">
+        {sorted.map((r) => {
+          const masteredFrac = r.totalCards === 0 ? 0 : r.masteredCards / r.totalCards;
+          return (
+            <li key={r.lessonId} className="flex items-center gap-3 p-3 text-sm">
+              <Link to={`/lessons/${r.lessonId}`} className="flex-1 truncate font-medium">
+                {r.name}
+              </Link>
+              <div className="h-2 w-24 overflow-hidden rounded-full bg-brand-100 dark:bg-slate-800">
+                <div className="h-full bg-success-500" style={{ width: `${Math.round(masteredFrac * 100)}%` }} />
+              </div>
+              <span className="w-12 text-right text-xs text-slate-500">{r.masteredCards}/{r.totalCards}</span>
+              <span className="w-12 text-right text-xs font-semibold text-brand-700 dark:text-brand-200">{r.scorePct}%</span>
+              <span className="w-20 text-right text-xs text-slate-500">{relativeTime(r.lastSessionAt)}</span>
+            </li>
+          );
+        })}
+      </ul>
+    </div>
+  );
+}