drop zone, and remove beta tag from mraid checker

src/tools/playworksConverter.ts

@@ -569,6 +569,7 @@ ${getToolWebviewStyles()}
     const networks = [...document.querySelectorAll('.net-cb')]
       .filter(c => c.checked).map(c => c.dataset.tag);
     statusEl.textContent = 'Converting...';
+    statusEl.classList.add('is-busy');
     resultsEl.innerHTML = '';
     openOutBtn.style.display = 'none';
     outputPanel.classList.add('is-hidden');
@@ -603,11 +604,13 @@ ${getToolWebviewStyles()}
       convertBtn.disabled = false;
       updateConvertBtn();
       if (msg.error) {
+        statusEl.classList.remove('is-busy');
         statusEl.textContent = 'Error: ' + msg.error;
         outputPanel.classList.add('is-hidden');
         return;
       }
       const results = msg.results || [];
+      statusEl.classList.remove('is-busy');
       const ok = results.filter(r => r.ok).length;
       statusEl.textContent = ok + ' of ' + results.length + ' network(s) converted.';
       if (!results.length) {