Watchlist and Wishlist are now proper sidebar pages with full design
treatment matching the app's established visual language — glass
containers, gradient headers, accent lines, card hover effects.
Watchlist page: artist grid with sort (name/scan date/date added),
search filter, last scan summary strip, live scan activity, batch
selection, all existing sub-modals (artist config, global settings,
artist detail slideout) preserved and working.
Wishlist page: stats strip (album count, singles count, next cycle),
category cards with mosaic backgrounds, track list with inline search
filter, batch operations, download integration. Auto-processing
detection on header button shows download progress modal when active.
Header buttons rewired to navigate to pages. All refresh points updated
to reinitialize pages instead of reopening modals. Timer/polling cleanup
on page navigation. Artist detail overlay converted to fixed positioning.
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