feat(ui): theme settings, stories polish, track editor restructure

- add dark/light/system theme with persisted choice + OS change listener
- restyle stories sidebar (search, item layout, border) to match captures
- move floating generate box to right column of stories, add top fade mask
- story track editor: sticky track labels aligned via flex rows, custom scrollbar with left/right zoom handles
- capture pill light mode pass, fix inline waveform progress color
- pull mcp_server hidden imports into the pyinstaller spec
- notarization doc draft

app/src/components/VoiceProfiles/ProfileCard.tsx

@@ -91,7 +91,7 @@ export function ProfileCard({ profile, disabled }: ProfileCardProps) {
         className={cn(
           'cursor-pointer transition-all flex flex-col h-[162px]',
           disabled ? 'opacity-40 hover:opacity-60' : 'hover:shadow-md',
-          isSelected && !disabled && 'ring-2 ring-accent shadow-md',
+          isSelected && !disabled && 'ring-2 border-transparent ring-accent shadow-md',
         )}
         onClick={handleSelect}
         tabIndex={0}