Remove dead code

- Delete ExifWriter.kt (instantiated but never called)
- Remove saveJpegFile() and unused imports from PhotoSaver
- Remove CameraFlipButton() and unused imports from LensSwitcher
- Remove companion object and unused imports from HapticFeedback
- Remove getZoomPresets() from LensController
- Update README to reflect ExifWriter removal and actual minSdk (35)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -18,7 +18,7 @@ A dedicated Android camera app for tilt-shift photography with real-time preview
 
 ## Requirements
 
-- Android 8.0 (API 26) or higher
+- Android 15 (API 35) or higher
 - Device with camera
 - OpenGL ES 2.0 support
 
@@ -66,8 +66,7 @@ app/src/main/java/no/naiv/tiltshift/
 │   ├── ZoomControl.kt        # Zoom UI component
 │   └── LensSwitcher.kt       # Lens selection UI
 ├── storage/
-│   ├── PhotoSaver.kt         # MediaStore integration
-│   └── ExifWriter.kt         # EXIF metadata handling
+│   └── PhotoSaver.kt         # MediaStore integration & EXIF handling
 └── util/
     ├── OrientationDetector.kt
     ├── LocationProvider.kt