Modernize MatterCommissioningScreeen to Material3

[TimoPtr]

Summary

This PR modernize the MatterCommissioning to use the same pattern we use in every new screen.

Checklist

• New or updated tests have been added to cover the changes following the testing guidelines.
• The code follows the project's code style and best_practices.
• The changes have been thoroughly tested, and edge cases have been considered.
• Changes are backward compatible whenever feasible. Any breaking changes are documented in the changelog for users and/or in the code for developers depending on the relevance.
• I have read the Open Home Foundation AI Policy.

Select exactly one option that describes AI usage in this contribution:

• I have not used AI for this contribution.
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[Copilot]

Pull request overview

This PR migrates the Matter device commissioning UI from the legacy Material (M2) *View composable to a modern Compose screen that matches the newer Home Assistant screen patterns and design system usage, and adds screenshot coverage for the new screen.

Changes:

• Replaced MatterCommissioningView (Material components) with a new MatterCommissioningScreen using Material3 + HA Compose components and the ServerChooser sheet.
• Updated MatterCommissioningActivity and MatterCommissioningViewModel to drive the new screen, including mapping servers to ServerChooserItems via ServerChooserItemsUseCase.
• Added a screenshot test for the commissioning screen and updated the changelog entry to mention Matter commissioning modernization.

Reviewed changes

Copilot reviewed 7 out of 55 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
app/src/screenshotTestFull/kotlin/io/homeassistant/companion/android/matter/ui/MatterCommissioningScreenshotTest.kt	Adds screenshot coverage for the new commissioning screen states.
app/src/main/res/xml/changelog_master.xml	Updates release notes to include Matter commissioning modernization.
app/src/full/kotlin/io/homeassistant/companion/android/matter/views/MatterCommissioningView.kt	Removes the legacy Material (M2) commissioning composable.
app/src/full/kotlin/io/homeassistant/companion/android/matter/ui/MatterCommissioningScreenPreviewStates.kt	Moves/renames the preview parameter provider to the new matter.ui package.
app/src/full/kotlin/io/homeassistant/companion/android/matter/ui/MatterCommissioningScreen.kt	Introduces the new Material3/HA-based commissioning screen implementation.
app/src/full/kotlin/io/homeassistant/companion/android/matter/MatterCommissioningViewModel.kt	Switches ViewModel server state to ServerChooserItem list built via ServerChooserItemsUseCase.
app/src/full/kotlin/io/homeassistant/companion/android/matter/MatterCommissioningActivity.kt	Updates setContent to use HATheme and render MatterCommissioningScreen.