Stats route logic moves into core/stats/queries.py as pure-ish functions
that take dependencies (database, image-url fixer, listening worker) as
arguments. The 13 route handlers in web_server.py shrink to thin
parse-args / jsonify wrappers.
What moved to core/stats/queries.py:
- stats_cached: 3-key metadata cache lookup + image url fix-up
- stats_overview / timeline / genres / library_health / db_storage
- stats_top_artists / top_albums / top_tracks: top-N + DB enrichment
- stats_recent: listening_history readback
- stats_resolve_track: title+artist -> file_path lookup for playback
- listening_stats_sync: spawns daemon thread that runs worker._poll
- listening_stats_status: stats payload, with None-worker fallback shape
No behavior change. Same response shapes, same error handling, same
silent-except on per-row enrichment failure. fix_artist_image_url
stays in web_server.py and is passed through as a callback so we
don't have to lift its config_manager / media-server dependencies in
this PR.
Adds tests/stats/test_stats_queries.py — 27 tests covering happy
paths, edge cases, image-url plumbing, worker glue.
Ruff clean. 694 tests pass (was 667 + 27 new).
Broque Thomas