feat(mobile): add Android Material You colors

[PixPMusic]

Summary

• add an Android-only Material You color toggle under Settings → Appearance → Theme
• keep it disabled by default, persist the preference, and restore the exact existing palette when turned off
• apply wallpaper-derived light and dark palettes to app chrome while preserving semantic danger and code/diff colors
• refresh dynamic colors when the app returns to the foreground

Why

Exact issue and PR searches for Material You and dynamic color found no existing implementation or tracking issue. #5694 broadly adds built-in themes, but does not implement Android wallpaper-derived colors and is not a dependency for this change.

Screenshots

Android system baseline

Stock Pixel Settings and Wallpaper & style on the same emulators, wallpaper palette, dark appearance, and dimensions used below. The reference shows the intended Material You balance: neutral large surfaces with wallpaper color concentrated in accents and selected controls.

Device	Settings	Wallpaper & style
Phone · 1080×1920
Pixel Fold · folded · 1080×2424
Pixel Fold · unfolded · 2076×2152

Before and after for every mobile showcase view. Full-resolution files live on the fork's pr-assets/android-material-you branch so they stay out of this PR's diff.

Phone · 1080×1920

View	Before	Material You
Appearance
Threads
Thread
Terminal
Review
Environments

Pixel Fold · folded · 1080×2424

View	Before	Material You
Appearance
Threads
Thread
Terminal
Review
Environments

Pixel Fold · unfolded · 2076×2152

View	Before	Material You
Appearance
Threads
Thread
Terminal
Review
Environments

Combined foldable validation

This PR stays focused on Material You colors. The remaining unfolded header/composer layout jank visible on the feature-only branch is fixed by the separate foldable/header PR. The local integration branch combines both changes only for validation; those layout changes are not included in this PR.

Unfolded home with no thread selected on the combined local integration branch:

Verification

• pnpm exec vp test run apps/mobile/src/lib/appearancePreferences.test.ts apps/mobile/src/lib/materialYouTheme.test.ts (18 tests)
• pnpm --filter @t3tools/mobile typecheck
• targeted vp lint and vp fmt for all changed source files
• manually verified toggle persistence, all 36 refreshed before/after screenshots, and six Android system baselines across phone, folded, and unfolded layouts

Checklist

• toggle is off by default
• Android 12+ uses the system wallpaper palette
• unsupported Android versions show a disabled setting
• iOS behavior is unchanged

Model: GPT-5.6 Sol | Harness: Codex in T3 Code

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[macroscopeapp]

Approvability

Verdict: Needs human review

This PR introduces a new user-facing feature (Android Material You colors) with platform-specific integrations, new UI components, runtime theme manipulation, and preferences changes. New features of this scope warrant human review.

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