feat: add easter egg - triple-tap settings title opens fiatcode.dev

- Add url_launcher dependency
- Add Android queries element for https scheme visibility
- Add triple-tap detection on Settings AppBar title
- Simplify to direct URL launch (no animation)

android/app/src/main/AndroidManifest.xml

@@ -48,5 +48,9 @@
             <action android:name="android.intent.action.PROCESS_TEXT"/>
             <data android:mimeType="text/plain"/>
         </intent>
+        <intent>
+            <action android:name="android.intent.action.VIEW"/>
+            <data android:scheme="https"/>
+        </intent>
     </queries>
 </manifest>