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/iosMain/kotlin/com/example/mycrib/platform/ImagePicker.ios.kt

@@ -101,6 +101,53 @@ private fun NSData.toByteArray(): ByteArray {
     }
 }
 
+@OptIn(ExperimentalForeignApi::class)
+@Composable
+actual fun rememberCameraPicker(
+    onImageCaptured: (ImageData) -> Unit
+): () -> Unit {
+    val viewController = LocalUIViewController.current
+
+    val cameraDelegate = remember {
+        object : NSObject(), UIImagePickerControllerDelegateProtocol, UINavigationControllerDelegateProtocol {
+            override fun imagePickerController(
+                picker: UIImagePickerController,
+                didFinishPickingMediaWithInfo: Map<Any?, *>
+            ) {
+                picker.dismissViewControllerAnimated(true, null)
+
+                val image = didFinishPickingMediaWithInfo[UIImagePickerControllerOriginalImage] as? UIImage
+                if (image != null) {
+                    // Convert to JPEG
+                    val jpegData = UIImageJPEGRepresentation(image, 0.8)
+                    if (jpegData != null) {
+                        val bytes = jpegData.toByteArray()
+                        val fileName = "camera_${NSDate().timeIntervalSince1970.toLong()}.jpg"
+                        onImageCaptured(ImageData(bytes, fileName))
+                    }
+                }
+            }
+
+            override fun imagePickerControllerDidCancel(picker: UIImagePickerController) {
+                picker.dismissViewControllerAnimated(true, null)
+            }
+        }
+    }
+
+    return {
+        // Check if camera is available
+        if (UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.UIImagePickerControllerSourceTypeCamera)) {
+            val picker = UIImagePickerController().apply {
+                setSourceType(UIImagePickerControllerSourceType.UIImagePickerControllerSourceTypeCamera)
+                setDelegate(cameraDelegate)
+                setCameraCaptureMode(UIImagePickerControllerCameraCaptureMode.UIImagePickerControllerCameraCaptureModePhoto)
+            }
+
+            viewController.presentViewController(picker, animated = true, completion = null)
+        }
+    }
+}
+
 @Suppress("UNCHECKED_CAST")
 private fun <T : Any> synchronized(lock: Any, block: () -> T): T {
     return block()