Introduce deferred album repair scanning and robust tracklist resolution plus UI/presentation tweaks.
- core/repair_worker.py: Add lazy MusicBrainz and AudioDB client accessors, per-batch folder queues, and register_folder/process_batch to defer folder scans until a batch completes. Implement cascading tracklist resolution (_resolve_album_tracklist) using Spotify/iTunes IDs, Spotify track→album lookup, album search, MusicBrainz release lookup, and AudioDB→MusicBrainz fallback. Add helpers to read Spotify track IDs, MusicBrainz album IDs, album/artist tags from files, MB/AudioDB fetchers, placeholder-ID filtering, and rename associated .lrc files when renaming audio files. Cache/locking and background-threaded scanning included. Improves resilience to missing/placeholder IDs and avoids circular imports.
- web_server.py: Register album folders for repair in post-processing and trigger repair_worker.process_batch when batches complete (multiple completion paths) so scans run after downloads finish.
- webui/static/script.js: Reduce unnecessary background work by skipping many fetches when the tab is hidden, and refresh dashboard-specific data on visibility change to ensure UI updates after OAuth or tab switch.
- webui/static/style.css: Replace glassmorphic backdrop-filters with opaque dark gradients for sidebar and main content to improve GPU rendering and visual consistency.
Overall: Adds reliable post-download album repair scanning using multiple metadata sources and reduces unnecessary client polling and heavy CSS effects for better performance and robustness.
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