Add adaptive community QR scanner

[klopez4212]

Summary

• Expand the pairing scanner from the Dynamic Island on supported iPhones
• Reveal the camera behind the pairing UI on Android and standard iPhones
• Preserve tap-to-dismiss and reduced-motion behavior

Testing

• just mobile-check
• just mobile-test
• iOS RunnerTests

[klopez4212]

🤖 QR scanner presentations

Dynamic Island

iPhone 16 Pro expands the scanner from the hardware island.

Standard device

iPhone SE reveals the camera behind the pairing surface.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 58a0ebeffa

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• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

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