fix(anime): scope preferences, paginate sources, harden installs

- Preference store keys entries by extension package + bridge source id; legacy unscoped entries are discarded once instead of being handed to whichever extension asks first
- Source picker's "Load more" appends the next page without duplicating streamed results
- Repository index fetches and subtitle/APK downloads now time out and are size-bounded instead of hanging or growing unbounded
- APK installs are staged to a temp file and renamed into place
- Stream metadata lookup matches the requested path, not only the currently playing one
- Reworked animeui into browse-state/detail-panel/panels.css modules
- Reverted premature CHANGELOG unreleased entries; refreshed anime-browser docs

src/main.ts

@@ -489,6 +489,7 @@ import {
 import { createMediaRuntimeService } from './main/media-runtime';
 import {
   createStreamPlaybackMetadataStore,
+  matchRequestedStreamPlaybackMetadata,
   toAnilistMediaGuess,
   toJimakuMediaInfo,
 } from './main/runtime/stream-playback-metadata';
@@ -2420,9 +2421,13 @@ const JELLYFIN_SUBTITLE_DELAYS_PATH = path.join(CONFIG_DIR, 'jellyfin-subtitle-d
  */
 const streamPlaybackMetadata = createStreamPlaybackMetadataStore();
 
-/** The stream metadata for whatever mpv currently has open, if it is a stream. */
-function getActiveStreamMetadata() {
-  return streamPlaybackMetadata.match(appState.currentMediaPath);
+/** Stream metadata for the requested path, or current media when none was supplied. */
+function getActiveStreamMetadata(mediaPath: string | null = null) {
+  return matchRequestedStreamPlaybackMetadata(
+    streamPlaybackMetadata,
+    mediaPath,
+    appState.currentMediaPath,
+  );
 }
 
 /**
@@ -2433,7 +2438,7 @@ async function guessAnilistMediaInfoForCurrentMedia(
   mediaPath: string | null,
   mediaTitle: string | null,
 ): Promise<AnilistMediaGuess | null> {
-  const stream = getActiveStreamMetadata();
+  const stream = getActiveStreamMetadata(mediaPath);
   const streamGuess = stream ? toAnilistMediaGuess(stream) : null;
   return streamGuess ?? guessAnilistMediaInfo(mediaPath, mediaTitle);
 }