Play favorites from freshly resolved formats, not the page URL

Streaming a page URL makes /api/stream re-run yt-dlp on every request --
slow, and a 500 on some sites -- so the player and the reels feed now
wait for App.videos.ensureFormats() when an item has no formats
(favorites, or a card clicked before its hover-resolve landed) and play a
real media URL with the extractor's headers, the same path a hovered card
takes. Favorites' download does the same. The page URL survives only as a
last resort when resolution yields nothing.

Two things in the proxy kept this site broken either way:

heavyfetish serves media from paths with a trailing slash
(/get_file/.../11097_720p.mp4/), which missed every extension test in
stream_video and sent even a resolved media URL down the yt-dlp branch --
a full extraction per request, including every seek.

Its CDN (st17.heavyfetish.com) also serves a certificate that expired
2026-02-16, so the upstream fetch failed verification and returned 500.
A browser can't play such a host at all, which is much of why this proxy
exists, so impersonate_get() now retries once without verification, logs
it, and remembers the host so the doomed handshake isn't repeated for
every range request. STREAM_TLS_VERIFY_ONLY=1 restores the hard failure.

Verified in headless Chrome against the real site: a favorite holding
only the page URL now resolves, streams (206, video/mp4, duration
3167.8s, readyState 4, no error) and shows "720p mp4 | 480p mp4" in the
quality menu.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QBDkEXP4htyXTCZUwMLphd

frontend/js/favorites.js

@@ -187,8 +187,10 @@ App.favorites = App.favorites || {};
             if (downloadBtn) {
                 downloadBtn.onclick = (event) => {
                     event.stopPropagation();
-                    App.videos.downloadVideo(item);
                     App.videos.closeAllMenus();
+                    // Same as playback: resolve a real media URL first rather
+                    // than pointing the download at the page URL.
+                    App.videos.ensureFormats(item).then(() => App.videos.downloadVideo(item));
                 };
             }
             const uploaderBtn = card.querySelector('.uploader-link');