fix: reuse background overlay across mpv reconnects

src/main.ts

@@ -2524,6 +2524,7 @@ const {
   createMpvClientRuntimeService: createMpvClientRuntimeServiceHandler,
   updateMpvSubtitleRenderMetrics: updateMpvSubtitleRenderMetricsHandler,
   tokenizeSubtitle,
+  isTokenizationWarmupReady,
   createMecabTokenizerAndCheck,
   prewarmSubtitleDictionaries,
   startBackgroundWarmups,
@@ -2563,6 +2564,12 @@ const {
       }
       mediaRuntime.updateCurrentMediaPath(path);
     },
+    signalAutoplayReadyIfWarm: (path) => {
+      if (!isTokenizationWarmupReady()) {
+        return;
+      }
+      maybeSignalPluginAutoplayReady({ text: path, tokens: null }, { forceWhilePaused: true });
+    },
     restoreMpvSubVisibility: () => {
       restoreOverlayMpvSubtitles();
     },