Add expo-bluesky-video-compress native module

Replaces react-native-compressor's video path with a local Expo module.

Native pipeline:
- iOS: AVAssetReader + AVMutableVideoComposition + AVAssetWriter with
  VideoToolbox encode, BGRA reader for HDR -> SDR conversion, BT.709
  color tagging, DataRateLimits hard cap, AAC re-encode.
- Android: MediaExtractor -> MediaCodec(decoder) -> GL pipeline ->
  MediaCodec(encoder) -> MediaMuxer. BITRATE_MODE_CBR for tight target
  enforcement, GL transform-matrix rotation (no double-rotation),
  raw AAC passthrough, hardware encoder selection with software
  fallback, QTI AVC denylist.

Codec selection: 'auto' resolves to h264 (HLS pipeline + licensing).
HEVC remains opt-in via codec: 'hevc' for future feature-flagged use.

compress.ts adds probe-based smart-skip: clips that are already at or
below 5 Mbps / 1920px / 100MB bypass re-encoding entirely.

react-native-compressor stays as a dep for now since pickVideo and
VideoTranscodeBackdrop still use its non-compression helpers; full
removal is a follow-up.

modules/expo-bluesky-video-compress/src/ExpoBlueskyVideoCompressModule.ts

@@ -0,0 +1,23 @@
+import {type EventSubscription, requireNativeModule} from 'expo-modules-core'
+
+import {
+  type CompressResult,
+  type NativeCompressOptions,
+  type VideoMetadata,
+} from './types'
+
+type ProgressEvent = {id: number; progress: number}
+
+interface ExpoBlueskyVideoCompressModule {
+  probe(uri: string): Promise<VideoMetadata>
+  compress(uri: string, options: NativeCompressOptions): Promise<CompressResult>
+  cancel(): void
+  addListener(
+    eventName: 'onProgress',
+    listener: (event: ProgressEvent) => void,
+  ): EventSubscription
+}
+
+export default requireNativeModule<ExpoBlueskyVideoCompressModule>(
+  'ExpoBlueskyVideoCompress',
+)

modules/expo-bluesky-video-compress/src/types.ts

@@ -0,0 +1,44 @@
+export type CodecPreference = 'auto' | 'hevc' | 'h264'
+
+export type VideoMetadata = {
+  width: number
+  height: number
+  duration: number
+  bitrate: number
+  fileSize: number
+  mimeType: string
+  codec: string
+  hasAudio: boolean
+  frameRate: number
+  rotation: number
+}
+
+export type CompressOptions = {
+  targetBitrate?: number
+  maxSize?: number
+  codec?: CodecPreference
+  frameRateCap?: number
+}
+
+export type CompressCallbacks = {
+  onProgress?: (progress: number) => void
+  signal?: AbortSignal
+}
+
+export type CompressResult = {
+  uri: string
+  size: number
+  mimeType: string
+  width: number
+  height: number
+  duration: number
+  codec: 'h264' | 'hevc'
+}
+
+export type NativeCompressOptions = {
+  targetBitrate: number
+  maxSize: number
+  codec: CodecPreference
+  frameRateCap: number
+  jobId: number
+}