feat(history): miniatures des vidéos importées (i.ytimg déterministe)

server/index.mjs

@@ -893,13 +893,18 @@ r.post('/user/history/takeout', authMiddleware, oauthLimiter, (req, res) => {
       const videoId = String(it?.videoId || '').trim().slice(0, 64);
       if (!/^[A-Za-z0-9_-]{6,64}$/.test(videoId)) { skipped++; continue; }
       const title = String(it?.title || '').slice(0, 300) || videoId;
+      // Miniature YouTube déterministe quand Takeout n'en fournit pas.
+      let thumbnail = String(it?.thumbnail || '').slice(0, 500);
+      if (!thumbnail && /^[A-Za-z0-9_-]{11}$/.test(videoId)) {
+        thumbnail = `https://i.ytimg.com/vi/${videoId}/hqdefault.jpg`;
+      }
       let watchedAt = new Date().toISOString();
       if (it?.watchedAt) {
         const d = new Date(String(it.watchedAt));
         if (!Number.isNaN(d.getTime())) watchedAt = d.toISOString();
       }
       try {
-        upsertWatchHistory({ userId: req.user.id, provider: 'youtube', videoId, title, watchedAt });
+        upsertWatchHistory({ userId: req.user.id, provider: 'youtube', videoId, title, thumbnail, watchedAt });
         imported++;
       } catch { skipped++; }
     }