fix: recover mpv playback after the OS resumes from sleep (#2172)

mpv/ffmpeg had no network-level timeout or reconnect options, so a
network stream left open across a system sleep would block forever on
the now-dead TCP connection instead of failing or reconnecting. Since
Node-MPV's IPC commands only resolve when mpv replies, a wedged mpv
process also made quit()/restart hang indefinitely, so the only way
out was to kill the whole app.

- Add --network-timeout and ffmpeg reconnect options to mpv's default
  parameters so a stalled stream fails fast instead of hanging.
- Make the quit() helper resilient to an unresponsive mpv process by
  racing it against a timeout and force-killing as a fallback.
- Listen for Electron's powerMonitor 'resume' event and tell the
  renderer to reload mpv, so playback recovers automatically instead
  of requiring a manual app restart.

src/preload/mpv-player.ts

@@ -174,6 +174,10 @@ const rendererPlayerFallback = (cb: (data: boolean) => void) => {
     ipcRenderer.on('renderer-player-fallback', (_, data) => cb(data));
 };
 
+const rendererMpvReconnect = (cb: () => void) => {
+    ipcRenderer.on('renderer-mpv-reconnect', () => cb());
+};
+
 export const mpvPlayer = {
     autoNext,
     cleanup,
@@ -205,6 +209,7 @@ export const mpvPlayerListener = {
     rendererAutoNext,
     rendererCurrentTime,
     rendererError,
+    rendererMpvReconnect,
     rendererNext,
     rendererPause,
     rendererPlay,