feat: Add native tap-to-focus lifecycle listeners

[mrousavy]

Summary

• expose addOnTapListener(...) and addOnFocusCompletedListener(...) on TapToFocusGestureController
• emit the native MeteringPoint immediately before focusing starts
• emit focus completion after iOS MeteringTask or CameraX focus resolves
• report Android tap coordinates in React Native logical units
• leave focus-reset events out of this PR

Test plan

• bun camera specs
• bun run lint-all
• bun camera typecheck
• bun camera build
• ./apps/simple-camera/android/gradlew -p apps/simple-camera/android :react-native-vision-camera:assembleDebug --no-daemon --console=plain
• bun example pods
• xcodebuild -workspace SimpleCamera.xcworkspace -scheme VisionCamera -sdk iphonesimulator -configuration Debug -destination generic/platform=iOS\ Simulator -derivedDataPath build CODE_SIGNING_ALLOWED=NO build -quiet

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Project	Deployment	Actions	Updated (UTC)
react-native-vision-camera-docs	Ready	Preview	Aug 24, 2026 4:05pm