feat(hosts): a host's page stays short — Docker folds past the busiest, monitors add on their own form, agent actions under Manage (#5276, #5277, #5278)

Docker panel (#5276): problems first, then the 8 busiest running
containers by CPU; the other running and the stopped fold behind one
"+N more running · M stopped" line. Containers that are not swarm tasks
read the way the Docker page reads them: CI jobs as "CI: workflow · job",
buildx builders as "BuildKit builder · name".

Monitors card (#5277): the edit/delete icon buttons and the inline add
form are gone. Each row links to its monitor's page; "Add monitor" opens
the add form filed under this host, starting from its address, with the
host in its breadcrumbs and Cancel back to it.

Agent card (#5278): Full metrics stays in view; Update, Rotate token,
Unregister agent (was "Remove") and Re-provision sit under "Manage agent".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

steward/templates/monitors/form.html

@@ -6,6 +6,8 @@
 {% block breadcrumb %}
 {%- if monitor -%}
 {{ crumbs([("Monitors", "/monitors/"), (monitor.name, "/monitors/" ~ monitor.id), ("Edit", "")]) }}
+{%- elif host -%}
+{{ crumbs([("Hosts", "/hosts/"), (host.name, "/hosts/" ~ host.id), ("Add monitor", "")]) }}
 {%- else -%}
 {{ crumbs([("Monitors", "/monitors/"), ("Add monitor", "")]) }}
 {%- endif -%}
@@ -47,10 +49,12 @@
     </div>
     {% if monitor and monitor.host_id %}
     <p class="field-hint">Linked to <a href="/hosts/{{ monitor.host_id }}">its host</a>.</p>
+    {% elif host %}
+    <p class="field-hint">Filed under <a href="/hosts/{{ host.id }}">{{ host.name }}</a>; it shows on that host's page.</p>
     {% endif %}
     <div style="display:flex;gap:0.5rem;">
       <button type="submit" class="btn btn-sm">{{ "Save" if monitor else "Add monitor" }}</button>
-      <a href="{{ '/monitors/' ~ monitor.id if monitor else '/monitors/' }}" class="btn btn-sm btn-ghost">Cancel</a>
+      <a href="{{ '/monitors/' ~ monitor.id if monitor else ('/hosts/' ~ host.id if host else '/monitors/') }}" class="btn btn-sm btn-ghost">Cancel</a>
     </div>
   </form>
 </div>