Improve template cards UI and fix template editing bugs

- Move delete button to cross (✕) at top-right corner of custom template cards
- Display template config as table instead of raw JSON
- Add engine_type to TemplateUpdate schema so engine changes are saved
- Fix editTemplate crash on missing template-test-results element
- Fix get_template route to catch ValueError for 404 responses
- Move device URL to pill badge next to device name
- Remove display index indicator from device cards
- Remember last used display in Test Capture via localStorage

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/wled_controller/static/style.css

@@ -282,6 +282,17 @@ section {
     flex-wrap: wrap;
 }
 
+.device-url-badge {
+    font-size: 0.7rem;
+    font-weight: 400;
+    color: var(--text-secondary);
+    background: var(--border-color);
+    padding: 2px 8px;
+    border-radius: 10px;
+    letter-spacing: 0.03em;
+    font-family: monospace;
+}
+
 .card-subtitle {
     display: flex;
     align-items: center;
@@ -1737,6 +1748,7 @@ input:-webkit-autofill:focus {
     transition: box-shadow 0.2s;
     display: flex;
     flex-direction: column;
+    position: relative;
 }
 
 .template-card:hover {
@@ -1785,6 +1797,7 @@ input:-webkit-autofill:focus {
     justify-content: space-between;
     align-items: center;
     margin-bottom: 12px;
+    padding-right: 24px;
 }
 
 .template-name {
@@ -1843,15 +1856,31 @@ input:-webkit-autofill:focus {
     padding: 4px 0;
 }
 
-.template-config-details pre {
-    background: var(--bg-secondary);
-    border: 1px solid var(--border-color);
-    border-radius: 4px;
-    padding: 12px;
+.config-table {
+    width: 100%;
     margin-top: 8px;
-    overflow-x: auto;
-    font-size: 12px;
-    line-height: 1.5;
+    border-collapse: collapse;
+    font-size: 13px;
+}
+
+.config-table td {
+    padding: 4px 8px;
+    border-bottom: 1px solid var(--border-color);
+}
+
+.config-table tr:last-child td {
+    border-bottom: none;
+}
+
+.config-key {
+    color: var(--text-secondary);
+    white-space: nowrap;
+    width: 1%;
+}
+
+.config-value {
+    color: var(--text-primary);
+    font-family: monospace;
 }
 
 .template-card-actions {