feat(stats): add v1 immersion stats dashboard (#19)

stats/src/components/library/LibraryTab.tsx

@@ -0,0 +1,67 @@
+import { useState, useMemo } from 'react';
+import { useMediaLibrary } from '../../hooks/useMediaLibrary';
+import { formatDuration } from '../../lib/formatters';
+import { MediaCard } from './MediaCard';
+import { MediaDetailView } from './MediaDetailView';
+
+interface LibraryTabProps {
+  onNavigateToSession: (sessionId: number) => void;
+}
+
+export function LibraryTab({ onNavigateToSession }: LibraryTabProps) {
+  const { media, loading, error } = useMediaLibrary();
+  const [search, setSearch] = useState('');
+  const [selectedVideoId, setSelectedVideoId] = useState<number | null>(null);
+
+  const filtered = useMemo(() => {
+    if (!search.trim()) return media;
+    const q = search.toLowerCase();
+    return media.filter((m) => m.canonicalTitle.toLowerCase().includes(q));
+  }, [media, search]);
+
+  const totalMs = media.reduce((sum, m) => sum + m.totalActiveMs, 0);
+
+  if (selectedVideoId !== null) {
+    return (
+      <MediaDetailView
+        videoId={selectedVideoId}
+        onBack={() => setSelectedVideoId(null)}
+        onNavigateToSession={onNavigateToSession}
+      />
+    );
+  }
+
+  if (loading) return <div className="text-ctp-overlay2 p-4">Loading...</div>;
+  if (error) return <div className="text-ctp-red p-4">Error: {error}</div>;
+
+  return (
+    <div className="space-y-4">
+      <div className="flex items-center gap-3">
+        <input
+          type="text"
+          placeholder="Search titles..."
+          value={search}
+          onChange={(e) => setSearch(e.target.value)}
+          className="flex-1 bg-ctp-surface0 border border-ctp-surface1 rounded-lg px-3 py-2 text-sm text-ctp-text placeholder:text-ctp-overlay2 focus:outline-none focus:border-ctp-blue"
+        />
+        <div className="text-xs text-ctp-overlay2 shrink-0">
+          {filtered.length} title{filtered.length !== 1 ? 's' : ''} · {formatDuration(totalMs)}
+        </div>
+      </div>
+
+      {filtered.length === 0 ? (
+        <div className="text-sm text-ctp-overlay2 p-4">No media found</div>
+      ) : (
+        <div className="grid grid-cols-2 sm:grid-cols-3 md:grid-cols-4 lg:grid-cols-5 gap-4">
+          {filtered.map((item) => (
+            <MediaCard
+              key={item.videoId}
+              item={item}
+              onClick={() => setSelectedVideoId(item.videoId)}
+            />
+          ))}
+        </div>
+      )}
+    </div>
+  );
+}