fix(android): preserve browser takeover handling

ui/flutter/android/app/src/main/AndroidManifest.xml

@@ -32,6 +32,12 @@
               android:name="io.flutter.embedding.android.NormalTheme"
               android:resource="@style/NormalTheme"
               />
+            <!-- app_links and share_handler own external download intents. Letting
+                 Flutter's Router handle the same URI races with the explicit
+                 navigation to the create-task page. -->
+            <meta-data
+                android:name="flutter_deeplinking_enabled"
+                android:value="false" />
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>