fix: single active profile and accurate download message

popup.js

@@ -40,8 +40,13 @@ function renderProfiles(profiles) {
     toggle.checked = !!p.enabled;
     toggle.title = 'Enable/disable';
     toggle.addEventListener('change', async () => {
-      p.enabled = toggle.checked;
+      if (toggle.checked) {
+        profiles.forEach((x) => { x.enabled = x.id === p.id; });
+      } else {
+        p.enabled = false;
+      }
       await saveProfiles(profiles);
+      renderProfiles(await getProfiles());
     });
     const edit = document.createElement('button');
     edit.className = 'btn';
@@ -199,7 +204,7 @@ $('#generatePdf').addEventListener('click', async () => {
   try {
     const res = await browser.runtime.sendMessage({ type: 'generate-pdf', data });
     if (!res || !res.ok) throw new Error((res && res.error) || 'Generation failed');
-    setStatus('PDF downloaded.', 'ok');
+    setStatus('PDF download started.', 'ok');
   } catch (err) {
     setStatus('Error: ' + err.message, 'error');
   }