Update cancel URL handling in HTTP and timer function templates

- Modify header template to use explicit `cancel_url` parameter
- Add `cancel_url` to new timer and HTTP function templates
- Remove default URL fallback in header template

templates/dashboard/http_functions/header.html

@@ -92,9 +92,8 @@
         </div>
 
         <!-- Cancel Button (right side) -->
-        <button class="group flex flex-col items-center text-gray-500 hover:text-blue-600"
-            hx-get="{{ cancel_url|default(url_for('dashboard_http_functions')) }}" hx-target="#container"
-            hx-swap="innerHTML" hx-push-url="true">
+        <button class="group flex flex-col items-center text-gray-500 hover:text-blue-600" hx-get="{{ cancel_url }}"
+            hx-target="#container" hx-swap="innerHTML" hx-push-url="true">
             <div class="p-2 rounded-lg group-hover:bg-blue-50">
                 <svg class="w-6 h-6" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24"
                     stroke-width="1.5" stroke="currentColor">

templates/dashboard/http_functions/new.html

@@ -10,6 +10,7 @@ show_logs=False,
 show_client=False,
 show_link=False,
 dashboardUrl=url_for('dashboard_http_functions'),
+cancel_url=url_for('dashboard_http_functions'),
 title='New HTTP Function')
 }}