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>

app/src/main/java/no/naiv/tiltshift/util/HapticFeedback.kt

@@ -5,8 +5,6 @@ import android.os.Build
 import android.os.VibrationEffect
 import android.os.Vibrator
 import android.os.VibratorManager
-import android.view.HapticFeedbackConstants
-import android.view.View
 
 /**
  * Provides haptic feedback for user interactions.
@@ -86,13 +84,4 @@ class HapticFeedback(private val context: Context) {
             vibrator.vibrate(longArrayOf(0, 50, 30, 50, 30, 50), -1)
         }
     }
-
-    companion object {
-        /**
-         * Use system haptic feedback on a View for standard interactions.
-         */
-        fun performHapticFeedback(view: View, feedbackConstant: Int = HapticFeedbackConstants.VIRTUAL_KEY) {
-            view.performHapticFeedback(feedbackConstant)
-        }
-    }
 }