More work on the management UI, multi printer is working, temps is sometimes working

Web UI Project/app/templates/_printer_grid.html

@@ -0,0 +1,14 @@
+<div class="grid grid-cols-1 gap-6 md:grid-cols-2 xl:grid-cols-3 2xl:grid-cols-4 auto-rows-fr">
+  {% for printer in printers.values() %}
+    {% include "_printer_card.html" %}
+  {% else %}
+    <div class="col-span-full text-center text-slate-400">
+      No printers configured. Check config.json file.
+    </div>
+  {% endfor %}
+</div>
+
+<!-- Debug info -->
+<div class="mt-8 text-sm text-slate-500">
+  Total Printers: {{ printers|length }}
+</div>