Android PWA shows white system UI in dark mode

[Anonymous1157]

Describe the bug

When using Sable as a PWA via IronFox (and probably other Firefox forks) on Android, the status bar (with the time and connection icons) at the top of the screen and the Three-Button Navigation bar at the bottom are still light-colored when Android is in dark mode.

Reproduction

1. Open app.sable.moe on Android
2. Three-dots menu -> "Add app to Home screen"
3. Toggle light/dark mode, observe the system UI around the PWA remaining light in dark mode

Expected behavior

The status bar and Three-Button Nav should at least change to a dark color when Android is in dark mode. Ideally the bars should follow the background color of the currently selected Sable theme which might not be a neutral off-white or almost-black.

Platform and versions

1. GrapheneOS (Android 16)
2. IronFox 148.0.1
3. Sable 1.5.3 (app.sable.moe running as PWA)

Additional context

No response