feat(ui): semantic tokens in RolesPage, SettingsPage, Toast, QueueView
- SecuritySettings: row bg-white/5 → bg-muted/30
- Toast: close button hover:bg-black/10 → hover:bg-muted/50
- QueueView: autoplay toggle thumb bg-white → bg-background
- RolesPage: cards/headers border-white/5, bg-black/40 → border-border, bg-card/80; headings text-white → text-foreground; row hover, inputs, badge → semantic
- SettingsPage: wrapper and tabs border/bg → border-border, bg-card/80, bg-muted/20; section cards; System Config title text-foreground
Co-authored-by: Cursor <cursoragent@cursor.com>
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