Restores the dimension reservation reverted in dae6f2d, scoped to
the embed.width && embed.height case only. No fallback aspect-ratio
when dims are null — that was the source of the dark letterbox bars
on Tenor/Klipy GIFs and OG-less images that triggered the revert.
The server-side probe in embedResolver.ts:196 already populates dims
for all image-type embeds; this change makes the client honor them.
Images now size naturally within max constraints instead of being
letterboxed into a 4/3 bg-surface-input container. Fixes dark bars
on GIFs and images whose aspect ratio doesn't match 4/3.
Add data-embed-thumbnail marker to VideoEmbed, GenericEmbed, and
RichEmbed thumbnail containers. Update detection logic to skip
these alongside avatars. Also remove redundant filename derivation
in Save Image menu item.
YouTube's embed API requires knowing the embedding origin to authorize
playback. The referrerPolicy="no-referrer" was stripping the Referer
header, and the missing origin param meant youtube-nocookie.com couldn't
verify the embed source, causing Error 153 (video player configuration
error). Fix: pass origin param explicitly and let the browser send the
default referrer.
1. Video aspect ratio: remove container border/overflow-hidden, use
preload="metadata" so browser knows dimensions before play
2. YouTube Error 153: remove sandbox attr (too restrictive), add full
allow permissions (encrypted-media, accelerometer, gyroscope, etc.)
3. Google Images not displaying: detect image Content-Type from HTTP
response in metadataFetcher, override classifier to create image
embed for URLs that serve image/* content
4. Audio seeking broken: add HTTP Range request support in uploads
route (Accept-Ranges, Content-Range, 206 Partial Content)
Jannis Braun