Add camera functionality for task completion photos

- Add camera picker interface to common ImagePicker.kt
- Implement camera capture for Android using ActivityResultContracts.TakePicture
- Implement camera capture for iOS using UIImagePickerController
- Add camera picker stubs for wasmJs, jsMain, and jvmMain platforms
- Update CompleteTaskDialog to show both "Take Photo" and "Choose from Library" buttons
- Add camera permissions to Android manifest (CAMERA permission, camera intent queries)
- Configure Android FileProvider for camera photo sharing
- Add camera and photo library usage descriptions to iOS Info.plist
- Update iOS CompleteTaskView with native camera picker support
- Fix cancel button in CompleteTaskView using @Environment(\.dismiss)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

composeApp/src/jvmMain/kotlin/com/example/mycrib/platform/ImagePicker.jvm.kt

@@ -13,3 +13,15 @@ actual fun rememberImagePicker(
         println("Image picker not yet implemented for desktop")
     }
 }
+
+@Composable
+actual fun rememberCameraPicker(
+    onImageCaptured: (ImageData) -> Unit
+): () -> Unit {
+    // Desktop camera picker would require platform-specific camera access
+    // This is a placeholder implementation
+    return {
+        // TODO: Implement desktop camera capture
+        println("Camera picker not yet implemented for desktop")
+    }
+}