Fix lost camera after reconnect

[pblazej]

Resolves #898

Currently, there's no way to prevent this fallback to .first:

device = devices.first { $0.position == self.options.position } ?? devices.first

which may be unstable. This is very "narrow" fix, hard to tell more without debug logs.

Should not affect any other paths than the fallback (options are stored, see below).

Alternative solution

Persist device (position) even with empty options across cleanups around:

// Reset state
_cameraCapturerState.mutate { $0 = State(options: $0.options) }

Scenario assuming .unspecified default:

1. First start — front camera selected with .unspecified position:
  2026-02-02 10:39:59.822 → starting camera capturer device: <AVCaptureFigVideoDevice: 0x12103e800
    [前置相机][com.apple.avfoundation.avcapturedevice.built-in_video:1]>, format: (format: 'vide'/'420v'
    1280x 720, { 1- 60 fps}, photo dims:{1280x720,2016x1136}, fov:73.292, binned, supports vis
    (max strength:Low), max zoom:24.00 (upscales @1.43), ISO:23.0-2208.0, SS:0.000022-1.000000,
    supports multicam, supports Portrait Effect, dimensions: Dimensions(1280x720)), fps: 24(0...60)

  2. Quick reconnect fails:
  2026-02-02 10:39:59.925 → [Connect] Reconnect mode: .quick failed with error:
    Error Domain=io.livekit.swift-sdk Code=100 "Cancelled" UserInfo={NSLocalizedDescription=Cancelled}

  3. Full reconnect starts:
  2026-02-02 10:40:00.983 → [Connect] starting .full reconnect sequence...
  2026-02-02 10:40:00.984 → withError: nil, isFullReconnect: true

  4. Unpublish fails on old publisher (track.stop() skipped, capturer not reset):
  2026-02-02 10:40:01.040 → Failed to unpublish track TR_VCxN3W8S9ufxhK with error
    Error Domain=io.livekit.swift-sdk Code=201 "WebRTC error(Failed to remove track)"
  2026-02-02 10:40:01.041 → captureState is not .stopped, capturer must be stopped before deinit.

  5. Full reconnect succeeds:
  2026-02-02 10:40:02.239 → [Connect] Full reconnect succeeded for attempt 2

  6. Same capturer restarts — rear camera selected, still .unspecified:
  2026-02-02 10:40:02.277 → starting camera capturer device: <AVCaptureFigVideoDevice: 0x12103ac00
    [后置双广角镜头][com.apple.avfoundation.avcapturedevice.built-in_video:6]>, format: (format:
    'vide'/'420v' 1280x 720, { 1- 30 fps}, photo dims:{1280x720,4224x2376}, fov:107.803, gdc
    fov:100.567, supports vis (max strength:Low), max zoom:123.75 (upscales @3.00), AF System:2,
    ISO:32.0-3072.0, SS:0.000018-1.000000, supports HDR, supports depth, supports multicam, supports
    high photo quality, dimensions: Dimensions(1280x720)), fps: 24(0...30)

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✨ Finishing touches

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• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch blaze/fix-lost-camera

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