Classify a silent translate-worker crash as out of memory

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/components/TranslatePanel.tsx

@@ -158,7 +158,13 @@ export function TranslatePanel({
           break;
       }
     };
-    worker.onerror = (event) => fail(event.message ?? "", "worker-crash");
+    // An empty crash message is the silent OOM tab-kill signature (D-027,
+    // D-030) — say so in words the "translate" stage classifies as OOM.
+    worker.onerror = (event) =>
+      fail(
+        event.message || "The translation stopped: the browser ran out of memory.",
+        "worker-crash",
+      );
     const request: TranslateRequest = {
       type: "translate",
       requestId,