Fix/cast wake on sleep - #6005
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Root cause: Android 14's "Low Power Standby" feature cuts network access for the app while the TV is asleep unless it's on a small hardcoded OS allowlist that SmartTube isn't part of. No app-level fix can override this; it requires disabling the feature at the OS level (see WAKE_ON_CAST_FIX.md for the exact adb commands and a wireless-adb setup walkthrough). Also fixes several real bugs found along the way that are necessary once network access is restored: - Utils.turnScreenOn() was a no-op when called with an Application context (which ViewManager always did) since it only acted on Activity contexts; added wakeUpScreen() (real PowerManager wake lock, works from any context) and wakeUpAndOpenActivity() (full-screen- intent notification, not subject to background-activity-launch grace-period restrictions). - RemoteControlService now holds a partial wake lock for its lifetime so the background cast connection survives screen-off. - SplashPresenter now actually requests the battery-optimization and overlay-permission exemptions at runtime (declaring them in the manifest alone doesn't grant them). - PlaybackActivity.onResume() also dismisses the keyguard with a real Activity context as a backup path. MediaServiceCore submodule (forked, see .gitmodules) also gets a fix for a tight zero-backoff retry loop in LoungeService's reconnect logic that would busy-loop retrying DNS every ~10ms after the TV woke up, instead of giving the network a moment to recover.
RemoteControlReceiver already listens for boot broadcasts to restart the background cast service; now it also brings the app to the foreground on genuine boot actions (BOOT_COMPLETED, QUICKBOOT_POWERON, LOCKED_BOOT_COMPLETED), not on the other actions it listens to like SCREEN_ON/TIME_SET which would be too aggressive. Relies on the SYSTEM_ALERT_WINDOW background-activity-start exemption already in place.
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