Fix cancel button styling in edit mode

- Change cancel button CSS classes from 'btn btn-outline' to 'tt-btn tt-btn-outline'
- This ensures consistent styling with the reset and submit buttons
- All buttons in the form-actions now use the proper design system classes

static/js/modules/form-manager.js

@@ -246,7 +246,7 @@ export class FormManager {
         const cancelBtn = document.createElement('button');
         cancelBtn.type = 'button';
         cancelBtn.id = 'cancelEdit';
-        cancelBtn.className = 'btn btn-outline';
+        cancelBtn.className = 'tt-btn tt-btn-outline';
         cancelBtn.textContent = 'Cancel Edit';
         
         const formActions = document.querySelector('.form-actions');