fix: Beschreibung generieren — AbortController, Readonly, Gold-Styling

- Textarea readonly + visuell gedimmt während Generierung läuft
- AbortController bricht Request ab wenn Modal geschlossen wird
- Stern-Icon entfernt, Button-Text in Gold (Akzentfarbe)
- api.js _request() unterstützt externen AbortSignal

src/static/js/api.js

@@ -12,10 +12,15 @@ const API = {
         };
     },
 
-    async _request(method, path, body = null) {
+    async _request(method, path, body = null, externalSignal = null) {
         const controller = new AbortController();
         const timeout = setTimeout(() => controller.abort(), 30000);
 
+        // Externen Abort weiterleiten an internen Controller
+        if (externalSignal) {
+            externalSignal.addEventListener('abort', () => controller.abort(), { once: true });
+        }
+
         const options = {
             method,
             headers: this._getHeaders(),
@@ -70,8 +75,8 @@ const API = {
         return this._request('GET', `/incidents${query}`);
     },
 
-    enhanceDescription(title, description, type) {
-        return this._request('POST', '/incidents/enhance-description', { title, description, type });
+    enhanceDescription(title, description, type, signal = null) {
+        return this._request('POST', '/incidents/enhance-description', { title, description, type }, signal);
     },
 
     createIncident(data) {