Add haptic feedback, rich task completion, and Google Sign-In preparation

- Add platform haptic feedback abstraction (HapticFeedback.kt) with
  implementations for Android, iOS, JVM, JS, and WASM
- Enhance CompleteTaskDialog with interactive 5-star rating, image
  thumbnails, and haptic feedback
- Add ImageBitmap platform abstraction for displaying selected images
- Localize TaskTemplatesBrowserSheet with string resources
- Add Android widgets infrastructure (small, medium, large sizes)
- Add Google Sign-In button components and auth flow preparation
- Update strings.xml with new localization keys for completions,
  templates, and document features
- Integrate haptic feedback into ThemePickerDialog

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

composeApp/src/androidMain/AndroidManifest.xml

@@ -100,6 +100,54 @@
                 <action android:name="com.example.casera.ACTION_UNCANCEL_TASK" />
             </intent-filter>
         </receiver>
+
+        <!-- Widget Task Complete Receiver -->
+        <receiver
+            android:name=".widget.WidgetTaskActionReceiver"
+            android:exported="false">
+            <intent-filter>
+                <action android:name="com.example.casera.COMPLETE_TASK" />
+            </intent-filter>
+        </receiver>
+
+        <!-- Small Widget Receiver (2x1) -->
+        <receiver
+            android:name=".widget.CaseraSmallWidgetReceiver"
+            android:exported="true"
+            android:label="@string/widget_small_name">
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
+            </intent-filter>
+            <meta-data
+                android:name="android.appwidget.provider"
+                android:resource="@xml/casera_small_widget_info" />
+        </receiver>
+
+        <!-- Medium Widget Receiver (4x2) -->
+        <receiver
+            android:name=".widget.CaseraMediumWidgetReceiver"
+            android:exported="true"
+            android:label="@string/widget_medium_name">
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
+            </intent-filter>
+            <meta-data
+                android:name="android.appwidget.provider"
+                android:resource="@xml/casera_medium_widget_info" />
+        </receiver>
+
+        <!-- Large Widget Receiver (4x4) -->
+        <receiver
+            android:name=".widget.CaseraLargeWidgetReceiver"
+            android:exported="true"
+            android:label="@string/widget_large_name">
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
+            </intent-filter>
+            <meta-data
+                android:name="android.appwidget.provider"
+                android:resource="@xml/casera_large_widget_info" />
+        </receiver>
     </application>
 
 </manifest>