fixes

browser-extension/background.js

@@ -1,12 +1,18 @@
 let serverUrl = '';
 
-browser.storage.sync.get('serverUrl').then(r => {
-  if (r.serverUrl) serverUrl = r.serverUrl.replace(/\/+$/, '');
-});
+function norm(v) {
+  return (v || '').replace(/\/+$/, '');
+}
+
+async function getServerUrl() {
+  const r = await browser.storage.sync.get('serverUrl');
+  serverUrl = norm(r.serverUrl);
+  return serverUrl;
+}
 
 browser.storage.onChanged.addListener(changes => {
   if (changes.serverUrl) {
-    serverUrl = changes.serverUrl.newValue.replace(/\/+$/, '');
+    serverUrl = norm(changes.serverUrl.newValue);
   }
 });
 
@@ -22,10 +28,18 @@ browser.runtime.onMessage.addListener((msg, sender) => {
 });
 
 async function request(path, opts) {
-  if (!serverUrl) throw new Error('Server URL not configured');
+  const base = await getServerUrl();
+  if (!base) {
+    throw new Error('Server URL not set — open snotes and click "Capture" → "Apply to Extension", or set it in Options');
+  }
   opts = opts || {};
   opts.credentials = 'include';
-  const res = await fetch(serverUrl + path, opts);
+  let res;
+  try {
+    res = await fetch(base + path, opts);
+  } catch (e) {
+    throw new Error('Cannot reach ' + base + ' (' + e.message + ')');
+  }
   if (!res.ok) {
     const err = await res.json().catch(() => ({}));
     throw new Error(err.detail || 'HTTP ' + res.status);