- Make semantic colors and the page indicator theme-aware so they keep
adequate contrast in dark mode instead of using fixed values.
- Seed a full brand color scheme (#6C63FF) for devices without dynamic
color (Android 11 and below) instead of falling back to Material's
purple baseline; align the XML AppTheme accent accordingly.
- Stop manually forcing transparent system bar colors in the Compose
theme; those setters are no-ops on Android 15+ and stripped the system
contrast scrim, causing the half-gray navigation bar on One UI. Keep
syncing the bar icon appearance with the active theme.
- Add a dynamic-color opt-out toggle (Android 12+), defaulting off on
One UI where Samsung's palette extraction tends to look off.
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