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/app.js

@@ -1617,21 +1617,34 @@ async generateDescription() {
         const btn = document.getElementById('btn-enhance-description');
         const btnText = document.getElementById('enhance-btn-text');
         const spinner = document.getElementById('enhance-spinner');
+        const textarea = document.getElementById('inc-description');
 
         if (title.length < 3 || !btn) return;
+
+        // Vorherigen Request abbrechen falls noch aktiv
+        if (this._enhanceController) this._enhanceController.abort();
+        this._enhanceController = new AbortController();
+
         btn.disabled = true;
         btnText.style.display = 'none';
         spinner.style.display = '';
+        textarea.readOnly = true;
+        textarea.classList.add('textarea--loading');
 
         try {
-            const result = await API.enhanceDescription(title, description || null, type);
-            document.getElementById('inc-description').value = result.description;
+            const result = await API.enhanceDescription(title, description || null, type, this._enhanceController.signal);
+            textarea.value = result.description;
         } catch (err) {
-            UI.showToast('Beschreibung konnte nicht generiert werden', 'error');
+            if (err.name !== 'AbortError') {
+                UI.showToast('Beschreibung konnte nicht generiert werden', 'error');
+            }
         } finally {
             btnText.style.display = '';
             spinner.style.display = 'none';
             btn.disabled = title.length < 3;
+            textarea.readOnly = false;
+            textarea.classList.remove('textarea--loading');
+            this._enhanceController = null;
         }
     },
 
@@ -3029,6 +3042,13 @@ function openModal(id) {
 }
 
 function closeModal(id) {
+    // Laufenden Beschreibung-generieren-Request abbrechen
+    if (id === 'modal-new' && App._enhanceController) {
+        App._enhanceController.abort();
+        App._enhanceController = null;
+        const ta = document.getElementById('inc-description');
+        if (ta) { ta.readOnly = false; ta.classList.remove('textarea--loading'); }
+    }
     const modal = document.getElementById(id);
     releaseFocus(modal);
     modal.classList.remove('active');