feat: add TV focus support for Switch widget

[usmanvrtx]

Description

This PR adds TV focus support for the Switch widget, allowing it to properly participate in TV focus navigation with a dedicated focus border rendered in the foreground.

Related Issue

N/A

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Refactoring (no functional changes)

What Has Changed

• Added paintFocusBorderInForeground option to _TVFocusOnlyWrapper to render focus border using foregroundDecoration instead of decoration
• Created TVFocusOnlyBoxWrapper as a reusable StatelessWidget for wrapping any widget with TV focus support
• Added wrapTVFocus parameter to InputWrapper to prevent double TV focus wrapping when the child already handles it
• Implemented _TVSwitchControl and _SwitchTVFocusBoxController for TV-focused switch rendering with proper focus border

How to Test

1. Run the app on a TV platform or TV emulator
2. Navigate to a Switch widget using the remote/d-pad
3. Verify the switch receives focus with a visible focus border painted in the foreground
4. Verify the toggle action still works correctly when focused

Screenshots / Videos

N/A

Checklist

• I have run flutter analyze and addressed any new warnings
• I have run flutter test and all tests pass
• I have tested my changes on the relevant platform(s)
• I have updated documentation if needed
• My changes do not introduce new warnings or errors