Update TableViewCell backgroundConfiguration to reflect style

[joannaquu]

Platforms Impacted

• iOS
• visionOS
• macOS

Description of changes

TableViewCell currently uses UIBackgroundConfiguration.clear() regardless of what style the cell is. This is fine on iOS. On visionOS, this means that plain cells have rectangular corners when they should have rounded ones. Update backgroundConfiguration to reflect the cell style.

Binary change

(This feels wrong to me but I double checked it)

Total increase: 104 bytes
Total decrease: -21,464 bytes

File	Before	After	Delta
Total	30,908,368 bytes	30,887,008 bytes	🎉 -21,360 bytes

Full breakdown

File	Before	After	Delta
PersonaCell.o	62,744 bytes	62,848 bytes	⚠️ 104 bytes
FocusRingView.o	815,288 bytes	815,176 bytes	🎉 -112 bytes
__.SYMDEF	4,774,672 bytes	4,772,600 bytes	🎉 -2,072 bytes
TableViewCell.o	812,456 bytes	809,560 bytes	🎉 -2,896 bytes
BooleanCell.o	89,864 bytes	86,400 bytes	🎉 -3,464 bytes
BottomCommandingController.o	846,336 bytes	842,832 bytes	🎉 -3,504 bytes
PersonaListView.o	185,616 bytes	182,072 bytes	🎉 -3,544 bytes
PopupMenuItemCell.o	176,080 bytes	170,208 bytes	🎉 -5,872 bytes

Verification

Visual Verification

Before	After

Pull request checklist

This PR has considered:

• Light and Dark appearances
• iOS supported versions (all major versions greater than or equal current target deployment version)
• VoiceOver and Keyboard Accessibility
• Internationalization and Right to Left layouts
• Different resolutions (1x, 2x, 3x)
• Size classes and window sizes (iPhone vs iPad, notched devices, multitasking, different window sizes, etc)
• iPad Pointer interaction
• SwiftUI consumption (validation or new demo scenarios needed)
• Objective-C exposure (provide it only if needed)

Microsoft Reviewers: Open in CodeFlow