fix: apply dynamic (Material You) colors to backgrounds, toggles, and status bar on API 31+

[mvanhorn]

Summary

On Android 12+ with dynamic colors, backgrounds, switches, the status bar, and dialog surfaces now follow the wallpaper-derived palette instead of keeping stock colors. Text and icons already picked it up; this fills in the surfaces that did not.

Why this matters

You confirmed the report in #560 (One UI screenshots) and noted a special configuration for switches and backgrounds would probably be needed, with the constraint that no appcompat/Material dependency be added. This stays library-free: it wires the platform's own @android:color/system_accent1_* / system_neutral1_* resources (API 31+) into the existing Theme.DeviceDefault* styles through resource-qualifier overlays, which the OEM skins populate from the dynamic-color engine.

Changes

• values-v31/styles.xml redefines the existing theme styles with explicit colorAccent, colorControlActivated, colorControlHighlight, colorBackground, windowBackground, and statusBarColor entries; the v29 items (windowLightStatusBar, navigationBarColor) are carried over so nothing regresses.
• The DayNight style references alias colors defined in values-v31/colors.xml (day) and overridden in values-night-v31/colors.xml (night).
• No Java changes and no new dependencies. AndroidSettings.setTheme already applies these style IDs; resource resolution picks the v31 variants on Android 12+, so behavior below API 31 is untouched.

Testing

Built and inspected resource resolution for the v31 qualifiers. Verified the style names and item sets mirror the base values/styles.xml definitions so pre-31 devices resolve exactly the resources they resolve today.

Fixes #560

[github-actions]

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[TrianguloY]

Thank you for the PR, much appreciated.

As I mentioned in the other one, I'm currently out-of-programming for a bit, so it may take time until I can properly review this (feel free to ping me in a month if needed).

This pr however only touches assets, so it may be faster (a bit concerned about the 88 lines to the style file though)