feat(overlay): run session help commands with Enter or double-click (#275)

src/main.ts

@@ -3073,9 +3073,15 @@ function openSubtitleGenerationOverlay(): void {
   );
 }
 
+// currentMediaPath follows every mpv path change and is cleared on disconnect; the
+// client's currentVideoPath outlives the connection, so a reconnect could reuse it.
+function isMediaPlaybackActive(): boolean {
+  return appState.mpvClient?.connected === true && Boolean(appState.currentMediaPath?.trim());
+}
+
 function openSessionHelpOverlay(): void {
   openOverlayHostedModalWithOsd(
-    openSessionHelpModalRuntime,
+    (deps) => openSessionHelpModalRuntime({ ...deps, isMediaPlaybackActive }),
     'Session help overlay unavailable.',
     'Failed to open session help overlay.',
   );