Update from Git Manager GUI

renderer/Settings.jsx

@@ -5,6 +5,30 @@ export default function Settings() {
   const [giteaToken, setGiteaToken] = useState('');
   const [giteaURL, setGiteaURL] = useState('');
 
+  function normalizeAndValidateGiteaUrl(rawUrl) {
+    const value = (rawUrl || '').trim();
+    if (!value) return { ok: true, value: '' };
+
+    let parsed;
+    try {
+      parsed = new URL(value);
+    } catch (_) {
+      return {
+        ok: false,
+        error: 'Ungültige Gitea-URL. Beispiel für IPv6: http://[2001:db8::1]:3000'
+      };
+    }
+
+    if (parsed.protocol !== 'http:' && parsed.protocol !== 'https:') {
+      return {
+        ok: false,
+        error: 'Die Gitea-URL muss mit http:// oder https:// beginnen.'
+      };
+    }
+
+    return { ok: true, value: value.replace(/\/$/, '') };
+  }
+
   useEffect(() => {
     window.electronAPI.loadCredentials().then(data => {
       if (data) {
@@ -16,7 +40,13 @@ export default function Settings() {
   }, []);
 
   const save = () => {
-    window.electronAPI.saveCredentials({ githubToken, giteaToken, giteaURL });
+    const checkedUrl = normalizeAndValidateGiteaUrl(giteaURL);
+    if (!checkedUrl.ok) {
+      alert(checkedUrl.error);
+      return;
+    }
+
+    window.electronAPI.saveCredentials({ githubToken, giteaToken, giteaURL: checkedUrl.value });
     alert('Settings saved securely!');
   }