Update controllers to return JSON and fix parameter handling

- Fix decorator parameter order issues with @with_session
- Return JSON responses instead of HTML fragments
- Add proper error handling with JSON error responses
- Fix route parameter conflicts in delete and update endpoints

src/controllers/preset.py

@@ -25,7 +25,8 @@ async def create_preset(request):
         data = request.json
         preset_id = presets.create()
         if presets.update(preset_id, data):
-            return json.dumps(presets.read(preset_id)), 201, {'Content-Type': 'application/json'}
+            preset_data = presets.read(preset_id)
+            return json.dumps({preset_id: preset_data}), 201, {'Content-Type': 'application/json'}
         return json.dumps({"error": "Failed to create preset"}), 400
     except Exception as e:
         return json.dumps({"error": str(e)}), 400