[camera_avfoundation] Fix Swift 6 Sendability warning in CaptureDevice protocol#11634

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teclas-gif:fix/camera-avfoundation-sendability-swift6

Commits on May 2, 2026

[camera_avfoundation] Fix Swift 6 Sendability warning in CaptureDevice protocol
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[camera_avfoundation] Add test for @Sendable completion handler
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