Isolate speech transport failures and keep experimental media usable

apps/desktop/src/main.ts

@@ -484,6 +484,7 @@ async function refreshSemanticStatus() {
                 ? "Speech models ready · Spoken passages are waiting to be indexed."
                 : "Local speech passages ready. Recognized words and timings can contain errors."
             : "Local speech passages are preparing. Filename and existing content search remain available.";
+      speechStatus.textContent = `Experimental speech search · ${speechStatus.textContent}`;
     }
     const retry = element<HTMLButtonElement>("retry-model");
     retry.hidden =