fix(ios): add VoiceOver accessibility properties to cluster annotation badge

[ArtyormSatori]

Fixes #100
\n### Problem\nNitroClusterAnnotationView lacked accessibility configuration, causing VoiceOver to either read unformatted raw label strings or lose context on cluster markers.\n\n### Solution\n- Configured isAccessibilityElement = true and accessibilityTraits = .button on the annotation view.\n- Disabled separate accessibility focus on subviews (circle and label).\n- Formatted accessibilityLabel with localized plural marker count and added accessibilityHint for zoom action.

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• package/ios/NitroClusterAnnotationView.swift

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📝 Summary

Summary by CodeRabbit

• Accessibility
  • Cluster markers are announced as actionable buttons for assistive technology users.
  • Labels communicate the number of markers in each cluster.
  • Localized hints indicate that activating a cluster zooms in for a closer view.
  • Internal visual elements are not announced separately, reducing duplicate or confusing announcements.

Walkthrough

NitroClusterAnnotationView now presents each cluster badge as an accessible button. It provides a localized label with the exact marker count and a localized hint to zoom in. Its inner views are excluded from accessibility.

Changes

iOS cluster accessibility

Layer / File(s)	Summary
Accessible cluster badge package/ios/NitroClusterAnnotationView.swift	The annotation view becomes an accessibility element with button traits. The inner circle and label are excluded. The view now always uses the localized plural count format and retains the zoom-in hint.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix · Severity of issue fixed: Low

Merge Risk: 🔵 Low · up to 8d57a

VoiceOver users may hear incorrect singular grammar for singleton clusters. The impact is narrow and does not block map interaction, but the stated localization objective is not fully met.

🚥 Pre-merge checks | ✅ 4 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	The implementation satisfies the button, focus exclusion, exact-count, hint, and visual-preservation requirements in [#100]. setUp() sets isAccessibilityElement = true, .button, and excludes `ci…	Use localized singular and plural format strings for accessibilityLabel, and select the singular form when count == 1. Keep the exact count and String.localizedStringWithFormat usage.
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the iOS VoiceOver accessibility change and uses the required fix: prefix. It is 76 characters, which exceeds the recommended 50-character limit, but it remains concise…
Description check	✅ Passed	The description clearly explains the accessibility problem, the implemented VoiceOver configuration, localized marker count, accessibility hint, and linked issue. It is directly related to the changes…
Out of Scope Changes check	✅ Passed	The reviewed change is limited to package/ios/NitroClusterAnnotationView.swift. The accessibility properties, label, hint, and related formatting support the cluster-badge requirements in [#100]. No…
Security Check	✅ Passed	No medium, high, or critical vulnerability is introduced. The PR only adds UIKit accessibility metadata and a localized label in NitroClusterAnnotationView.swift. The label is formatted with a trust…

Full details: Linked Issues check

Explanation

The implementation satisfies the button, focus exclusion, exact-count, hint, and visual-preservation requirements in [#100]. setUp() sets isAccessibilityElement = true, .button, and excludes circle and label. configure(count:) uses count rather than the abbreviated badge text. However, accessibilityLabel always uses "%d markers in this cluster". It does not provide distinct singular wording for a count of 1, so the localized singular/plural requirement is not met.

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Inline comments:
In `@package/ios/NitroClusterAnnotationView.swift`:
- Around line 72-75: Add a plural-aware stringsdict resource for the cluster
accessibility label in the package resource bundle, using the key from
NitroClusterAnnotationView’s accessibilityLabel and providing locale entries for
counts 1 and 2 in every supported locale. Ensure the existing localized
formatting resolves singular grammar for 1 and plural grammar for 2 and larger
counts.

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[ArtyormSatori]

Updated the localized formatting logic to explicitly distinguish singular (1 marker in this cluster) and plural counts (%d markers in this cluster) to ensure accurate VoiceOver grammar across all count ranges.

[jkasprzyk17]

Thanks @ArtyormSatori for the PR, this is a nice VoiceOver fix 🙌

Please drop the count == 1 branch. setUp() and using the exact count look good. The singular/plural if is English-only and blocks a later .stringsdict (count 1 never hits the %d key).

Use one format, as in #100:

accessibilityLabel = String.localizedStringWithFormat(
  NSLocalizedString("%d markers in this cluster", comment: "Map marker cluster"),
  count
)

No need to add .stringsdict in this PR. “1 markers” in English is fine until we ship real localization.

Once that’s in, I’ll approve ✅

[ArtyormSatori]

Updated the accessibility label format to use unified String.localizedStringWithFormat as requested. Thanks @jkasprzyk17!

[jkasprzyk17]

Looks good approved ✅

Thanks for the follow-up on the singular/plural format. This matches what we needed.

If you're interested, there's a similar gap on Android tracked in #101.