fix(jassub): [PKG-JASSUB-08] transfer offscreen canvas before queued rendering

refactor/baselines/jassub-offscreen-patch.json

@@ -0,0 +1,11 @@
+{
+  "task": "PKG-JASSUB-08",
+  "baselineCommit": "0f3c068aae1415c2d40ede8708f02f4c5864fe7a",
+  "file": "packages/artplayer-plugin-jassub/src/jassub.es.js",
+  "originalSha256LF": "1fdcf24d206e8711348dddcb5fe7b656007a9b1d81a992bb497c6d10bd0a2cdb",
+  "patchedSha256LF": "6a96af7914f702eb7d6303b466cbe16abddd278040f60cd29f153cdf60e92cb2",
+  "patchFile": "refactor/baselines/jassub-offscreen.patch",
+  "patchSha256LF": "b6cb5c4cb3c9fab920724fa7ddfe7a6b58db68d177f720231f5823fc5bfd6dac",
+  "predecessor": "refactor/baselines/jassub-vendor-patch.json",
+  "purpose": "Transfer the initial offscreen canvas on Worker readiness before releasing queued resize/render messages; keep later reattachment behavior unchanged."
+}

refactor/baselines/jassub-offscreen.patch

@@ -0,0 +1,24 @@
+diff --git a/packages/artplayer-plugin-jassub/src/jassub.es.js b/packages/artplayer-plugin-jassub/src/jassub.es.js
+index 904b40888..6bd2bc2c6 100644
+--- a/packages/artplayer-plugin-jassub/src/jassub.es.js
++++ b/packages/artplayer-plugin-jassub/src/jassub.es.js
+@@ -143,7 +143,7 @@ class o extends EventTarget {
+         // @ts-ignore
+         useLocalFonts: typeof queryLocalFonts < "u" && (e.useLocalFonts ?? !0),
+         hasBitmapBug: o._hasBitmapBug
+-      }), this._offscreenRender === !0 && this.sendMessage("offscreenCanvas", null, [this._canvasctrl]);
++      });
+     }).catch((error) => {
+       if (!this._destroyed) this.destroy(error);
+     });
+@@ -580,6 +580,10 @@ class o extends EventTarget {
+   }
+   _ready() {
+     if (this._destroyed) return;
++    if (this._offscreenRender === !0 && !this._initialOffscreenSent) {
++      this._initialOffscreenSent = true;
++      this._worker.postMessage({ target: "offscreenCanvas", transferable: [this._canvasctrl] }, [this._canvasctrl]);
++    }
+     this._init(), this.dispatchEvent(new CustomEvent("ready"));
+   }
+   /**