fix(toolbar): restore toolbar key icon tint

[AsafMah]

Summary

Restores normal toolbar key icon/background tinting after the upstream v3.9.1 sync.

The sync introduced toolbar_key_background assignment and long-press hint wrapping in createToolbarKey(), but normal toolbar keys were no longer explicitly tinted after the drawable/background were assigned. State-key backgrounds still worked, but non-state toolbar icons could render with incorrect/default tint.

This PR reapplies the normal toolbar colors at key creation:

• ColorType.TOOL_BAR_KEY for the icon
• ColorType.TOOL_BAR_EXPAND_KEY_BACKGROUND for the toolbar-key background

Verification

• ./gradlew.bat :app:assembleStandardfullDebug --no-daemon --console=plain passed

Blocker before merge

This is a visual regression fix and is not yet visually verified on device. Wireless adb disconnected before I could install and capture a screenshot.

Before merging:

1. Install the rebuilt standardfullDebug APK on device.
2. Open the keyboard toolbar.
3. Capture/confirm toolbar icons/backgrounds look correct in the affected theme/state.
4. Then mark this PR ready and merge.

Do not merge on build-only evidence.