fix: Update onClick handlers to use renamed functions

- createTrainingStyle → createStyleDirection
- updateTrainingStyle → updateStyleDirection
- deleteTrainingStyle → deleteStyleDirection

Fixes: Stilrichtungen tab showed blank screen due to undefined function calls

version: 0.4.0 (frontend)
module: AdminCatalogsPage 2.2.0

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

frontend/src/pages/AdminCatalogsPage.jsx

@@ -509,7 +509,7 @@ export default function AdminCatalogsPage() {
                     ))}
                   </select>
                 </div>
-                <button className="btn btn-primary" onClick={createTrainingStyle}>Anlegen</button>
+                <button className="btn btn-primary" onClick={createStyleDirection}>Anlegen</button>
               </div>
 
               <div style={{ display: 'grid', gap: '16px' }}>
@@ -548,7 +548,7 @@ export default function AdminCatalogsPage() {
                           </select>
                         </div>
                         <div style={{ display: 'flex', gap: '8px' }}>
-                          <button className="btn btn-primary" onClick={() => updateTrainingStyle(ts.id, editingTS)}>Speichern</button>
+                          <button className="btn btn-primary" onClick={() => updateStyleDirection(ts.id, editingTS)}>Speichern</button>
                           <button className="btn" onClick={() => setEditingTS(null)}>Abbrechen</button>
                         </div>
                       </div>
@@ -563,7 +563,7 @@ export default function AdminCatalogsPage() {
                         <p style={{ margin: '8px 0', color: 'var(--text2)' }}>{ts.description}</p>
                         <div style={{ display: 'flex', gap: '8px' }}>
                           <button className="btn" onClick={() => setEditingTS(ts)}>Bearbeiten</button>
-                          <button className="btn" onClick={() => deleteTrainingStyle(ts.id)}>Löschen</button>
+                          <button className="btn" onClick={() => deleteStyleDirection(ts.id)}>Löschen</button>
                         </div>
                       </div>
                     )}