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/api/routes.py

@@ -794,8 +794,9 @@ async def get_template(
     template_store: TemplateStore = Depends(get_template_store),
 ):
     """Get template by ID."""
-    template = template_store.get_template(template_id)
-    if not template:
+    try:
+        template = template_store.get_template(template_id)
+    except ValueError:
         raise HTTPException(status_code=404, detail=f"Template {template_id} not found")
 
     return TemplateResponse(
@@ -822,6 +823,7 @@ async def update_template(
         template = template_store.update_template(
             template_id=template_id,
             name=update_data.name,
+            engine_type=update_data.engine_type,
             engine_config=update_data.engine_config,
             description=update_data.description,
         )