Replace hardcoded `--color-primary` references on the title detail screen
with a dedicated `--color-title-accent` / `--color-title-accent-foreground`
variable pair, allowing the poster-derived palette to style title UI
elements without polluting the global primary color.
- Add `--color-title-accent` and `--color-title-accent-foreground` to
`global.css` with default warm amber values
- Update `use-title-theme.ts` to set `--color-title-accent` instead of
`--color-primary`; switch from `useFocusEffect` to `useEffect`
- Replace all `bg-primary`, `text-primary`, `border-primary` etc. in
`title/[id].tsx` and title components with `title-accent` equivalents
- Add `accentColor` prop to `StarRating` so it can receive the resolved
CSS variable value at runtime
- Pass `iconColor={titleAccent}` to all `SectionHeader` instances on the
title detail screen
- Use platform-appropriate store icon (App Store / Google Play) for the
"Where to Watch" section header
- Switch progress bar in `ContinueWatchingBanner` from `bg-status-watching`
to `bg-title-accent`
jake