fix(iOS): remove private api use from broadcast picker

[Brazol]

Summary by CodeRabbit

• Bug Fixes

  • Fixed iOS screen sharing so the broadcast picker opens using supported system interactions.
  • Added handling and logging for cases where the broadcast picker control cannot be located.

• Documentation

  • Added an upcoming release note describing the iOS screen-sharing fix.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: b39ca2b2-9846-4a21-8178-e3d8e8361826

📥 Commits

Reviewing files that changed from the base of the PR and between d7098ba and f89e63d.

📒 Files selected for processing (2)

• CHANGELOG.md
• ios/stream_webrtc_flutter/Sources/stream_webrtc_flutter/FlutterRTCDesktopCapturer.m

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📝 Walkthrough

Walkthrough

Changes

iOS broadcast picker

Layer / File(s)	Summary
Public broadcast picker trigger ios/stream_webrtc_flutter/Sources/stream_webrtc_flutter/FlutterRTCDesktopCapturer.m, CHANGELOG.md	Screen-share activation replaces the private buttonPressed: selector with a public UIButton touch-up event, logs when no button is found, and records the change in the changelog. Nearby video-track construction is reformatted without behavior changes.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and accurately summarizes the main change: removing private API use from the iOS broadcast picker.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/private-api-use-removed

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