TextInputLayout outline mode does not support dynamic boxBackgroundColor via ColorStateList

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### Issue Summary
When using `TextInputLayout` with `boxBackgroundMode="outline"`, the `boxBackgroundColor` does not respond to `ColorStateList` changes. This makes it impossible to change the background color dynamically on focus, unlike `filled` mode which works as expected.

### Steps to Reproduce
1. Create a selector color resource with `state_focused` and default.
2. Set it to `app:boxBackgroundColor` in XML.
3. Use `boxBackgroundMode="outline"`.

### Expected Behavior
The background color of the outlined box should change when focused.

### Actual Behavior
Only the default color is applied. Focused state is ignored.

### Environment
- Material Components version: [your version]
- Android version: [your device/emulator]
- Theme: Material3 / Material2

### Additional Notes
This behavior is inconsistent with `filled` mode and limits UI flexibility. Please consider adding support for `ColorStateList` in outline mode.

Start by reproducing the issue with TextInputLayout in outline mode and a selector ColorStateList containing focused and default colors. Inspect the outline background-color handling and compare it with filled mode; done means the outlined box changes color when focus changes, with coverage for both states.

Written by the indexing model from the issue text.