Sync Stats & History window, headless --sync-cli, and Windows remote support (#160)

src/shared/socket-probe.ts

@@ -0,0 +1,28 @@
+import net from 'node:net';
+
+/**
+ * True when something is accepting connections on the unix socket / Windows
+ * named pipe (400 ms probe). Electron-free; shared by the sync CLI's
+ * running-app guard and the Windows mpv launch attach wait.
+ */
+export async function canConnectSocket(socketPath: string): Promise<boolean> {
+  return await new Promise<boolean>((resolve) => {
+    const socket = net.createConnection(socketPath);
+    let settled = false;
+
+    const finish = (value: boolean): void => {
+      if (settled) return;
+      settled = true;
+      try {
+        socket.destroy();
+      } catch {
+        // ignore
+      }
+      resolve(value);
+    };
+
+    socket.once('connect', () => finish(true));
+    socket.once('error', () => finish(false));
+    socket.setTimeout(400, () => finish(false));
+  });
+}