agra 45aac312a8 camera: Dart facade + backend + channel + preview + tests ...

Phase 1c+1d of the ux.camera plan (see ~/banlu/plans/ux_camera.md).

  lib/src/camera/camera.dart            — UxCameraController (ValueNotifier),
                                          UxCameraValue, UxCameraDescription,
                                          enums, UxCameraException,
                                          uxAvailableCameras().
  lib/src/camera/camera_backend.dart    — abstract UxCameraBackend +
                                          UxCameraCreateResult + sealed
                                          UxCameraEvent variants.
  lib/src/camera/camera_channel.dart    — MethodChannelUxCameraBackend over
                                          ux/camera + ux/camera/events. Per-
                                          handle event demux. Maps
                                          PlatformException → UxCameraException.
  lib/src/camera/camera_preview.dart    — UxCameraPreview: Texture-backed,
                                          Hero-flightable preview widget.

  lib/src/testing/fake_camera.dart      — FakeUxCameraBackend with per-method
                                          call lists + emitXxx event injection.
                                          Exported from package:ux/testing.dart.

  test/camera/camera_controller_test    — 16 tests covering init/dispose,
                                          orientation events, takePicture
                                          (explicit + UxSensor fallback),
                                          startVideoRecording / stop,
                                          flip, flash, lock/unlock,
                                          multi-instance, error propagation.
  test/camera/camera_channel_test       — 10 tests pinning the wire format
                                          for every method + PlatformException
                                          mapping.

Orientation snapshot for capture is computed Dart-side and passed in as an
explicit arg to takePicture / startVideoRecording (default falls back to
UxSensor.orientation at call time). Native never queries UIDevice itself
for the snapshot — Dart-side fakes drive orientation deterministically.

Native plugin code lands in Phase 2+; today every channel call throws
MissingPluginException at runtime, which is fine — the controller is only
mounted from the camera page once Phase 5 cuts over. The test backend
already exercises the full controller surface.

2026-05-13 14:27:52 +03:00

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