feat(02-04): register Android OIDC callback

- Add AppAuth redirect receiver for recipe://callback
- Preserve existing launcher activity manifest wiring

composeApp/src/androidMain/AndroidManifest.xml

@@ -18,6 +18,20 @@
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
         </activity>
+        <activity
+                android:exported="true"
+                android:name="net.openid.appauth.RedirectUriReceiverActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW"/>
+
+                <category android:name="android.intent.category.DEFAULT"/>
+                <category android:name="android.intent.category.BROWSABLE"/>
+
+                <data
+                        android:host="callback"
+                        android:scheme="recipe"/>
+            </intent-filter>
+        </activity>
     </application>
 
 </manifest>