feat(ui): semantic tokens on library, chat, dashboard, search
PlaylistDetailView: hero border, overlay, sort buttons, table header, row hover → border-border, bg-background/50, hover:bg-muted/50
ChatMessage: action buttons hover, own/other bubbles, attachment preview, context menu, modal → muted/border/foreground
ChatRoom: header bar, channel item hover, input pill → bg-card/90 border-border, hover:bg-muted/50, bg-muted/30
TrackList: play icon and title when not current → text-foreground
SearchPageHeader: title, search container, input, clear button → text-foreground, bg-card/80 border-border, hover:bg-muted/50
Co-authored-by: Cursor <cursoragent@cursor.com>
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