docs: catch up docs for anilist, anime browser, and subsync fixes

- Add changelog entries for the split-cour AniList season resolution fix and the subsync stream-track fixes
- Document anime browser language filter, stream subtitle download-to-disk behavior, and series/season/episode metadata threading
- Update domain ownership and knowledge-base catalog for the anime browser modules
- Trim the credits table and clarify the M-Extension-Server licensing note in README

changes/anilist-season-resolution.md

@@ -0,0 +1,7 @@
+type: fixed
+area: anilist
+
+- Resolving "season N" against AniList no longer lands one season short for franchises whose broadcast seasons are listed as several entries. AniList records the back half of a split cour ("… Season 2 Part 2", "… Cour 2", "第2クール") as its own sequel, and the resolver counted each as a season — so Mushoku Tensei season 3 resolved to the season 2 entry and Re:ZERO season 4 to season 3, which then drove the character dictionary and AniList progress updates to the wrong series. A sequel carrying a part or cour marker that matches the season it continues is now followed without advancing the season count, in both the relation walk and the air-order fallback. Titles are compared ignoring punctuation, and the marker is looked for in every title and synonym rather than just the display title. A wrong match cached before this fix is remembered in `character-dictionaries/anilist-resolution-cache.json` and needs removing (or overriding from the character dictionary picker) for the affected series.
+- A special or OVA sitting in a franchise's sequel chain is walked through without counting as a season. Dr. STONE links STONE WARS to New World through a one-episode special, which made New World resolve as season 4 and every later season shift with it.
+- An AniList rate limit or network failure while walking sequel relations is reported so the caller can retry, instead of falling through to the air-date fallback. That fallback is for a franchise with missing relation edges; running it after a failed lookup turned a transient 429 into a confidently wrong season.
+- The shared title parser recognizes spelled-out episode labels (`Episode 4`, `第4話`) and a season named at the end of the title (`… Season 3`, `… 3rd Season`, `… S3`), which now fill the Season field instead of being searched for as part of the series name. The TsukiHime modal gained a Season field to match Jimaku, and seasons after the first are included in its search query so a later season's releases are actually found.

changes/anime-browser.md

@@ -20,3 +20,7 @@ area: anime
 - "Playing" is only reported once mpv actually configures a video output; when a stream fails to decode, the browser shows mpv's error instead of claiming playback started while no window ever appeared.
 - The Linux x64 bridge bundle is verified and pinned, so the anime browser starts on Linux instead of refusing with "No pinned checksum for linux-x64-bundle.zip".
 - The bridge bundle is fetched from the pinned release tag rather than whatever release is newest, so an upstream publish no longer breaks every install with a checksum mismatch.
+- The Extensions tab's available list has a language chip row: pick one or more languages to narrow a repository index that otherwise lists every language it knows, or "All" to clear the filter. Rows name the language ("Japanese" instead of `ja`) and the Available heading counts what the filter leaves.
+- A stream's subtitle tracks are downloaded to a temp directory and loaded into mpv as files rather than streamed from the source URL, so they can serve as the alass reference in Subsync the way Jellyfin subtitles do. The format is detected from the file's own content, a track that fails to download falls back to its URL so the episode still plays, and the directory is removed when the next episode starts or the app exits.
+- An episode launched from the browser carries its series, season and episode number through the app instead of a single joined string: stats group by series (every stream previously landed in one entry named `m3u8`), rewatching reuses the existing entry, the Jimaku and TsukiHime modals prefill Title/Season/Episode from the source's own listing, AniList updates use those fields directly, and the mpv title reads `Series S03E04 - Episode Name`.
+- Opening the browser shows a tray icon on every platform and — on macOS — puts the app in the Cmd+Tab switcher and Dock, so you can switch between it and mpv; the Dock icon is released again when the window closes during playback. Launching a video starts a regular SubMiner session, and in `subminer anime` standalone mode closing the window during playback no longer quits the app and kills the stream.

changes/subsync-stream-tracks.md

@@ -0,0 +1,7 @@
+type: fixed
+area: subsync
+
+- Subsync now works when mpv loaded a subtitle track from a URL, which is how Aniyomi extension streams and Jellyfin add theirs. The track is downloaded to a temporary file first — reusing mpv's own request headers, so authenticated and referer-gated hosts stay reachable — instead of being rejected with "Subtitle file not found: https://…". This applies to both the sync target and the alass reference, so a Jimaku or TsukiHime download can be retimed against a stream's own subtitles. Internal tracks of a stream also pass mpv's headers through to `ffmpeg`.
+- Alass now works on tracks that arrive as WebVTT, which is what Aniyomi extension streams serve. Alass picks its parser from the file extension and has no WebVTT support, so it treated a `.vtt` reference as a video file and failed with "no audio stream in file". Both the target and the reference are rewritten as SRT for alass, keeping the cue text as-is, and the originals are left untouched.
+- Leaving `subsync.alass_path`, `ffsubsync_path`, or `ffmpeg_path` empty now actually auto-discovers the binary, as the config help has always claimed. Previously it fell back to a hard-coded `/usr/bin/<tool>`, which does not exist on macOS and broke subsync for every default-config install there. Discovery searches `PATH` plus the usual install prefixes (a GUI launch inherits a minimal `PATH`) and accepts `alass-cli` as well as `alass`. An explicitly configured path is still used verbatim and never silently substituted.
+- Subsync failures are written to the application log. Previously the only trace was an OSD toast that vanished after a few seconds, leaving nothing to diagnose from.