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/ui/LensSwitcher.kt

@@ -9,9 +9,6 @@ import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.shape.CircleShape
-import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.filled.CameraRear
-import androidx.compose.material3.Icon
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
@@ -90,28 +87,3 @@ private fun LensButton(
         )
     }
 }
-
-/**
- * Simple camera flip button (for future front camera support).
- */
-@Composable
-fun CameraFlipButton(
-    onClick: () -> Unit,
-    modifier: Modifier = Modifier
-) {
-    Box(
-        modifier = modifier
-            .size(48.dp)
-            .clip(CircleShape)
-            .background(Color(0x80000000))
-            .clickable(onClick = onClick),
-        contentAlignment = Alignment.Center
-    ) {
-        Icon(
-            imageVector = Icons.Default.CameraRear,
-            contentDescription = "Switch Camera",
-            tint = Color.White,
-            modifier = Modifier.size(24.dp)
-        )
-    }
-}