feat: Add home screen music playback widget

Introduces a new app widget for music playback control and display. Adds widget provider classes, update manager, view factory, and related resources (layouts, colors, strings, XML). Integrates widget updates with MediaService to reflect current playback state. Updates AndroidManifest to register the widget.

app/src/main/AndroidManifest.xml

@@ -73,5 +73,20 @@
                 android:name="autoStoreLocales"
                 android:value="true" />
         </service>
+
+        <receiver
+            android:name=".widget.WidgetProvider4x1"
+            android:exported="false"
+            android:label="@string/widget_label">
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>
+            </intent-filter>
+            <meta-data
+                android:name="android.appwidget.provider"
+                android:resource="@xml/widget_info"/>
+        </receiver>
+
+
+
     </application>
-</manifest>
+</manifest>