feat(android): foreground-app automation condition

Make the existing Application automation rule (foreground app -> activate
scene) work on the Android-TV build. A Kotlin ForegroundAppBridge reads the
foreground app via UsageStatsManager and lists launchable apps via LauncherApps;
PlatformDetector bridges it in (ahead of the Windows-only ctypes guard) so the
existing AutomationEngine / ApplicationRule / storage / deactivation modes are
unchanged. New /system/installed-apps + /system/info endpoints feed an app picker
that stores package names (vs process names on desktop); on Android the editor
hides the match-type selector since the foreground app is the only obtainable
signal. PACKAGE_USAGE_STATS is granted via an on-device button + a web-UI banner
(no blanket prompt at capture start); detection degrades gracefully until granted.

Zero new Python/Gradle deps (UsageStatsManager + LauncherApps are in-platform;
matching only string-compares the package name, so no QUERY_ALL_PACKAGES).
assembleDebug + 1897 pytest + ruff + tsc + npm build all green; independent final
review (0 blockers) + security review (no critical issues).

android/app/src/main/AndroidManifest.xml

@@ -65,6 +65,18 @@
          service start. -->
     <uses-permission android:name="android.permission.CAMERA" />
 
+    <!-- PACKAGE_USAGE_STATS — read the foreground app for the "Application"
+         automation rule (foreground app -> activate scene) via UsageStatsManager.
+         A special-access permission: it can't be granted at runtime; the user
+         toggles it under Settings > Usage access (opened from MainActivity).
+         tools:ignore="ProtectedPermissions" silences the build warning that this
+         is a system/signature-level permission — it is honoured as a user-grantable
+         special access. NO QUERY_ALL_PACKAGES is needed: matching only compares the
+         foreground package NAME, and the app picker uses LauncherApps. -->
+    <uses-permission
+        android:name="android.permission.PACKAGE_USAGE_STATS"
+        tools:ignore="ProtectedPermissions" />
+
     <!-- Autostart on boot — BootReceiver spawns CaptureService in root
          mode so capture resumes without the user touching the remote. -->
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />