Add HTMX error handling with toast notifications for 5xx errors

app/templates/base.html

@@ -57,9 +57,41 @@
     {% block content %}{% endblock %}
     
     {% block modal %}{% endblock %}
+
+</script>
+<!-- Toast for 5xx errors -->
+<div id="error-toast" class="toast toast-top toast-end hidden">
+    <div class="alert alert-error">
+        <span id="error-message"></span>
+        <button class="btn btn-sm btn-ghost" onclick="document.getElementById('error-toast').classList.add('hidden')">Close</button>
+    </div>
+</div>
+
 <script>
+    // Configure HTMX to handle 5xx errors
+    document.addEventListener('htmx:responseError', function(evt) {
+        if (evt.detail.xhr.status >= 500 && evt.detail.xhr.status < 600) {
+            const toast = document.getElementById('error-toast');
+            const message = document.getElementById('error-message');
+            
+            // Extract error message from response
+            let errorMessage = 'Server Error';
+            try {
+                const responseJson = JSON.parse(evt.detail.xhr.response);
+                if (responseJson.error) {
+                    errorMessage = responseJson.error;
+                }
+            } catch (e) {
+                // If not JSON, use the raw response
+                errorMessage = evt.detail.xhr.response || 'Server Error';
+            }
+            
+            message.textContent = errorMessage;
+            toast.classList.remove('hidden');
+        }
+    });
+    
     // Check for global variable to set X-Simulate-500 header
-        // Set the custom header on all HTMX requests
     document.addEventListener('htmx:configRequest', function (evt) {
         if (typeof window.simulate500 === 'boolean' && window.simulate500) {
             evt.detail.headers['X-Simulate-500'] = 'true';