Changelog

0.2.4 (pre-release)

Library filename templates, tag category fetching for all backends, and a popout video streaming overhaul. 50+ commits since v0.2.3.

Changes since v0.2.3

New: library filename templates

Save files with custom names instead of bare post IDs. Templates use %id%, %artist%, %character%, %copyright%, %general%, %meta%, %species%, %md5%, %rating%, %score%, %ext% tokens. Set in Settings > Paths.

New core/library_save.py module with a single save_post_file entry point. All eight save sites (Save to Library, Save As, Bulk Save, Batch Download, and their bookmarks-tab equivalents) route through it.
DB-backed library_meta.filename column tracks the rendered name per post. Non-breaking migration for existing databases.
Sequential collision suffixes (_1, _2, _3) when multiple posts render to the same filename (e.g. same artist).
Same-post idempotency via get_library_post_id_by_filename lookup. Re-saving a post that already exists under a different template returns the existing path.
find_library_files and delete_from_library updated to match templated filenames alongside legacy digit-stem files.
is_post_in_library / get_saved_post_ids DB helpers replace filesystem walks for saved-dot indicators. Format-agnostic.
reconcile_library_meta cleans up orphan meta rows on startup.
Saved-dot indicators fixed across all tabs for templated filenames.
Library tab single-delete and multi-delete now clean up library_meta rows (was leaking orphan rows for templated files).
Save As dialog default filename comes from the rendered template instead of the old hardcoded post_ prefix.
Batch downloads into library folders now register library_meta (was silently skipping it).
Bookmark-to-library copies now register library_meta (was invisible to Library tag search).
Cross-folder re-save is now copy, not move (the atomic rename was a workaround for not having a DB-backed filename column).

New: tag category fetching

Tag categories (Artist, Character, Copyright, General, Meta, Species) now work across all four backends, not just Danbooru and e621.

New CategoryFetcher module with two strategies: batch tag API (Gelbooru proper with auth) and per-post HTML scrape (Rule34, Safebooru.org, Moebooru sites).
DB-backed tag_types cache table. Tags are fetched once per site and cached across sessions. clear_tag_cache in Settings wipes it.
Batch API probe result persisted per site. First session probes once; subsequent sessions skip the probe.
Background prefetch for Gelbooru batch API path only. search() fires prefetch_batch in the background when _batch_api_works is True, so the cache is warm before the user clicks.
Danbooru and e621 get_post now populates tag_categories inline (latent bug: was returning empty categories on re-fetch).
categories_updated signal re-renders the info panel when categories arrive asynchronously.
_categories_pending flag on the info panel suppresses the flat-tag fallback flash when a fetch is in progress. Tags area stays empty until categories arrive and render in one pass.
HTML parser two-pass rewrite: Pass 1 finds tag-type elements by class, Pass 2 extracts tag names from tags=NAME URL parameters in search links. Works on Rule34, Safebooru.org, and Moebooru.
save_post_file ensures categories before template render so %artist% / %character% tokens resolve on Gelbooru-style sites.
On-demand fetch model for Rule34 / Safebooru.org / Moebooru: ~200ms HTML scrape on first click, instant from cache on re-click.

Improved: popout video streaming

Click-to-first-frame latency on uncached video posts with the popout open is roughly halved. Single HTTP connection per video instead of two.

Stream-record. mpv's stream-record per-file option tees the network stream to a .part temp file as it plays. On clean EOF the .part is promoted to the real cache path. The parallel httpx download that used to race with mpv for the same bytes is eliminated. Seeks during playback invalidate the recording (mpv may skip byte ranges); the .part is discarded on seek, stop, popout close, or rapid click.
Redundant stops removed. _on_video_stream no longer stops the embedded preview's mpv when the popout is the visible target (was wasting ~50-100ms of synchronous command('stop') time). _apply_load_video no longer calls stop() before play_file (loadfile("replace") subsumes it).
Stack switch reordered. _apply_load_video now switches to the video surface before calling play_file, so mpv's first frame lands on a visible widget instead of a cleared image viewer.
mpv network tuning. cache_pause=no (stutter over pause for short clips), 50 MiB demuxer buffer cap, 20s read-ahead, 10s network timeout (down from ~60s).
Cache eviction safety. evict_oldest skips .part files so eviction doesn't delete a temp file mpv is actively writing to.

Bug fixes

Popout close preserves video position. closeEvent now snapshots position_ms before dispatching CloseRequested (whose StopMedia effect destroys mpv's time_pos). The embedded preview resumes at the correct position instead of restarting from 0.
Library popout aspect lock for images. Library items' Post objects were constructed without width/height, so the popout got 0/0 and _fit_to_content returned early without setting keep_aspect_ratio. Now reads actual pixel dimensions via QPixmap before constructing the Post.

Other

README updated, unused Windows screenshots dropped from the repo.
Tightened thumbnail spacing in the grid from 8px to 2px.

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