android: remove per-profile app picker, rule-set UI and SelectedApplicationsActivity

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/frontends/android/app/src/main/AndroidManifest.xml

@@ -108,10 +108,6 @@
             android:name=".ui.TrustedCertificatesActivity"
             android:label="@string/trusted_certs_title" >
         </activity>
-        <activity
-            android:name=".ui.SelectedApplicationsActivity"
-            android:label="@string/profile_select_apps" >
-        </activity>
         <activity
             android:name=".ui.LogActivity"
             android:label="@string/log_title" >