Enable Analyze before announcing readiness

boot.js

@@ -21,12 +21,14 @@ try {
       }
     },
   });
-  status.textContent = `Model ready (${dtype} on ${device}). `;
   initializeUi({
     analyze: createAnalyze({ scoreBatch, countTokens, device, dtype }),
     modelRepo: MODEL_REPO,
   });
+  // Enable before announcing readiness: a click on a disabled button is dropped
+  // silently, so "ready" must never appear while Analyze is still dead.
   button.disabled = false;
+  status.textContent = `Model ready (${dtype} on ${device}). `;
 } catch (exc) {
   status.textContent = '';
   error.textContent = `Could not load the model: ${exc.message}`;