Catch-all commit for outstanding pre-existing local changes. Mixes
several themes that would normally be split:
- Rename: UxPlugin → XPlugin across iOS, macOS, Android registrants.
- New top-level packages under lib/src/: anim/ (animated values,
panes, sheets, dock, measured), core/ (Emitter, ReactiveBuilder
scaffolding, presenter/widget/value/dispose primitives), navi/
(Screen/ScreenStack/Router/hero/transitions), reactive/.
- Edits across existing plugins (clipboard, crash, file, gallery,
keyboard, scanner, sensor, url) to align with the new core.
- Test updates and CHANGELOG/README touches accompanying the above.
macOS preview was stretching (aspect wrong) and macOS photo capture
was rotating the landscape sensor 90° because the shared
PhotoOutput / CameraInstance code was setting
`AVCaptureConnection.videoOrientation` from the orientation snapshot
unconditionally. iOS needs that to rotate sample buffers to portrait;
macOS desktop cams are physically landscape and any rotation just
skews the result.
Moved the rotation call behind a per-platform extension on
`AVCaptureConnection`:
- `ios/Classes/Camera/AVCaptureConnection+iOS.swift` applies the
snapshot orientation (current behavior).
- `macos/Classes/Camera/AVCaptureConnection+macOS.swift` is a
no-op. macOS-flavoured photos / preview frames now flow at
native landscape orientation.
`CaptureDevice` reports sensorOrientation=0 on macOS (was hardcoded
90 for iOS); on macOS the page's `normalizeCameraCapture` math then
collapses to identity and the saved JPEG stays the landscape the
sensor produced. iOS keeps sensorOrientation=90 (matches
camera_avfoundation's reported value and the existing capture-
transform math).
Photo and video paths now both produce upright content on macOS
(video already worked because VideoRecorder's transform table maps
the always-portraitUp macOS snapshot to `.identity`).
