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/androidMain/kotlin/com/example/mycrib/platform/ImagePicker.android.kt

@@ -1,11 +1,15 @@
 package com.mycrib.platform
 
+import android.content.Context
 import android.net.Uri
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.PickVisualMediaRequest
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
 import androidx.compose.ui.platform.LocalContext
+import androidx.core.content.FileProvider
+import java.io.File
 
 @Composable
 actual fun rememberImagePicker(
@@ -50,6 +54,46 @@ actual fun rememberImagePicker(
     }
 }
 
+@Composable
+actual fun rememberCameraPicker(
+    onImageCaptured: (ImageData) -> Unit
+): () -> Unit {
+    val context = LocalContext.current
+
+    // Create a temp file URI for the camera to save to
+    val photoUri = remember {
+        val photoFile = File(context.cacheDir, "camera_photo_${System.currentTimeMillis()}.jpg")
+        FileProvider.getUriForFile(
+            context,
+            "${context.packageName}.fileprovider",
+            photoFile
+        )
+    }
+
+    val launcher = rememberLauncherForActivityResult(
+        contract = ActivityResultContracts.TakePicture()
+    ) { success: Boolean ->
+        if (success) {
+            try {
+                val inputStream = context.contentResolver.openInputStream(photoUri)
+                val bytes = inputStream?.readBytes()
+                inputStream?.close()
+
+                if (bytes != null) {
+                    val fileName = "camera_${System.currentTimeMillis()}.jpg"
+                    onImageCaptured(ImageData(bytes, fileName))
+                }
+            } catch (e: Exception) {
+                e.printStackTrace()
+            }
+        }
+    }
+
+    return {
+        launcher.launch(photoUri)
+    }
+}
+
 private fun getFileNameFromUri(context: android.content.Context, uri: Uri): String {
     var fileName = "image_${System.currentTimeMillis()}.jpg"