fix(ios): stop repeating ChoiceSet label on every radio/checkbox item

[hggzm]

Fork-based PR (no Azure Pipelines CI). When ready for CI, push branch to upstream as users/hggzm/clean/fix-choiceset-label-repeat-483 and recreate.

History: upstream PRs #628 (closed)

Summary

VoiceOver was repeating the parent ChoiceSet label (e.g. "What color do you want?") with every radio button and checkbox item in expanded ChoiceSet inputs. This made navigation verbose and redundant since the label is already announced as a separate accessible element above the list.

Changes

• ACRChoiceSetViewDataSource.mm: Removed _accessibilityString (parent label) prefix from individual cell accessibility labels in configureCellForAccsessibility

Before

Each item announces: "What color do you want?, Red, radio button"

After

Each item announces: "Red, radio button"

The parent label is still accessible as a heading element above the list.

Testing

1. Open a card with an expanded ChoiceSet (radio or checkbox style)
2. Enable VoiceOver
3. Navigate through the radio/checkbox items
4. Verify each item announces only its own text and role, not the parent label

[hggzm]

VoiceOver Accessibility Validation

Automated a11y pipeline validates this fix using real UIAccessibility API data.

Annotated A11y Overlay

• 87 total accessible elements captured from rendered cards via XCUIElement queries
• accessibilityLabel, accessibilityValue, accessibilityFrame, accessibilityTraits verified
• Green numbered overlay boxes show exact VoiceOver focus rectangles
• Element data matches what VoiceOver reads at runtime

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