PM-40885: bug: Support overriding the colorscheme

[david-livefront]

🎟️ Tracking

PM-40885

📔 Objective

This PR fixes a bug in the QR Code Scan Screen (Password Manager and Authenticator) and the Card Scan Screen where we would force the UI to be in dark mode but the dynamic colors would be lost. This change still forces dark mode but preserves the dynamic color setting.

📸 Screenshots

Before	After
Screen_recording_20260723_155121.mp4	after.mp4

[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

Reviewed this bug fix that preserves dynamic (Material You) colors on the QR Code Scan and Card Scan screens while still forcing them to render in dark mode. The change introduces a new ColorSchemeOverride composable, provides light/dark dynamic color schemes via new CompositionLocals in BitwardenTheme, and migrates the three scan screens to the new helper. The logic is sound: dynamic schemes are used only when isDynamicTheme is active, otherwise the static dark/light schemes are applied.

Code Review Details

No blocking findings.

Verified:

• Adding context as the first parameter of BitwardenTheme is backward-compatible — all call sites (both MainActivitys, previews, and compose test harnesses) use named arguments.
• Narrowing dynamicBitwardenColorScheme and toMaterialColorScheme to internal is safe; both are only referenced within the :ui theme module.
• The isDynamicTheme gate in ColorSchemeOverride correctly routes to the dynamic schemes since dynamicBitwardenColorScheme sets isDynamicTheme = true for both light and dark variants.

Minor (non-blocking, not posted inline): the KDoc on LocalBitwardenDynamicDarkColorScheme reads "This is only to be used for dynamic that require the UI to have its colors overridden" — likely intended to mirror the light variant's wording.

[codecov]

Codecov Report

❌ Patch coverage is 47.36842% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.86%. Comparing base (f64a08d) to head (bbf7b31).

Files with missing lines	Patch %	Lines
...arden/ui/platform/base/util/ColorSchemeOverride.kt	37.50%	7 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7206      +/-   ##
==========================================
- Coverage   86.20%   85.86%   -0.34%     
==========================================
  Files         884     1032     +148     
  Lines       64657    67403    +2746     
  Branches     9674     9771      +97     
==========================================
+ Hits        55737    57878    +2141     
- Misses       5456     6020     +564     
- Partials     3464     3505      +41     

Flag	Coverage Δ
app-data	17.89% <0.00%> (+0.15%)	⬆️
app-ui-auth-tools	19.10% <0.00%> (+0.31%)	⬆️
app-ui-platform	17.08% <0.00%> (+0.52%)	⬆️
app-ui-vault	27.94% <42.10%> (+0.56%)	⬆️
authenticator	6.11% <36.84%> (+<0.01%)	⬆️
lib-core-network-bridge	4.02% <0.00%> (+<0.01%)	⬆️
lib-data-ui	1.15% <0.00%> (+<0.01%)	⬆️

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[aj-rosado]

LGTM

[david-livefront]

Thanks @aj-rosado