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).

README.md

@@ -115,7 +115,7 @@ LedGrab runs as a desktop / server application:
 | Notification capture | WinRT | dbus (Linux) | NotificationListenerService |
 | Monitor names | Friendly names (WMI) | Generic ("Display 0") | Single built-in display |
 | LED transports | Network, USB-serial, BLE | Network, USB-serial, BLE | Network, USB-serial (Android driver), BLE (Android bridge) |
-| Automation: window/process conditions | Supported | Partial | — |
+| Automation: window/process conditions | Supported | Partial | Foreground-app condition (UsageStatsManager) |
 
 ## Requirements