refactor: Update quick actions description and enhance AppCustomizationPage layout

- Revised the quick actions description in multiple languages to clarify their purpose as "Quickpills in chat."
- Adjusted the layout of AppCustomizationPage by reintroducing the quick pills section for improved user interaction.
- Modified spacing between UI elements for better visual consistency and usability.
- Streamlined the component structure to enhance maintainability and readability.

lib/l10n/app_localizations_de.dart

@@ -882,8 +882,7 @@ class AppLocalizationsDe extends AppLocalizations {
       'Design, Sprache, Stimme und Quick Pills';
 
   @override
-  String get quickActionsDescription =>
-      'Wähle bis zu zwei Schnellzugriffe, die neben dem Eingabefeld angepinnt werden';
+  String get quickActionsDescription => 'Schnellzugriffe im Chat';
 
   @override
   String get chatSettings => 'Chat';