feat(docker): group containers by compose/swarm + enrich widget (milestone 77 #942)

Container list now sub-groups each host's containers by compose project (or
swarm service) with a small subheading, preserving the running-first order;
hosts with no such labels render flat as before. The dashboard status widget
links each container to its detail page and surfaces enriched state inline —
health dot (healthy/unhealthy), restart count, and last non-zero exit code for
stopped containers. Completes the #942 UI surface.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016Jg27rgypiW2efULXJDtMC

plugins/docker/routes.py

@@ -175,6 +175,23 @@ async def rows():
             else:
                 g["stopped"] += 1
 
+    # Sub-group each host's containers by compose project (or swarm service),
+    # preserving the running-first ordering. Containers with neither label fall
+    # into an unlabelled bucket rendered flat, so plain hosts look unchanged.
+    for g in groups.values():
+        subs: dict[str, dict] = {}
+        order: list[str] = []
+        for item in g["containers"]:
+            c = item["container"]
+            label = c.compose_project or c.service_name or None
+            key = label or ""
+            if key not in subs:
+                subs[key] = {"label": label, "containers": []}
+                order.append(key)
+            subs[key]["containers"].append(item)
+        g["subgroups"] = [subs[k] for k in order]
+        g["grouped"] = any(s["label"] for s in g["subgroups"])
+
     host_groups = sorted(groups.values(), key=lambda g: g["host_name"].lower())
     running = sum(g["running"] for g in host_groups)
     total = len(containers)

plugins/docker/templates/docker/rows.html

@@ -47,7 +47,11 @@
       </tr>
     </thead>
     <tbody>
-      {% for item in g.containers %}
+      {% for sub in g.subgroups %}
+      {% if g.grouped and sub.label %}
+      <tr><td colspan="7" style="padding:0.4rem 0.75rem 0.2rem;font-size:0.72rem;color:var(--text-dim);text-transform:uppercase;letter-spacing:0.05em;font-weight:600;">{{ sub.label }}</td></tr>
+      {% endif %}
+      {% for item in sub.containers %}
       {% set c = item.container %}
       <tr>
         <td>
@@ -105,6 +109,7 @@
         <td>{{ item.sparkline_mem | safe }}</td>
       </tr>
       {% endfor %}
+      {% endfor %}
     </tbody>
   </table>
 </div>

plugins/docker/templates/docker/widget.html

@@ -24,9 +24,12 @@
   {% for c in g.containers %}
   <div style="display:flex;align-items:center;gap:0.5rem;font-size:0.82rem;padding:0.15rem 0;">
     <span class="dot {% if c.status == 'running' %}dot-up{% elif c.status == 'paused' %}dot-warn{% else %}dot-down{% endif %}"></span>
-    <span style="flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;">
+    <a href="/plugins/docker/container/{{ c.host_id }}/{{ c.name }}" style="flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:inherit;text-decoration:none;">
-      {{ c.name }}
+      {{ c.name }}{% if c.health == 'unhealthy' %}<span title="unhealthy" style="color:var(--red);"> ●</span>{% elif c.health == 'healthy' %}<span title="healthy" style="color:var(--green);"> ●</span>{% endif %}{% if c.restart_count %}<span title="restarts" style="color:var(--orange);font-size:0.7rem;"> ⟳{{ c.restart_count }}</span>{% endif %}
-    </span>
+    </a>
+    {% if c.status != 'running' and c.exit_code is not none and c.exit_code != 0 %}
+    <span title="last exit code" style="font-size:0.7rem;color:var(--red);flex-shrink:0;">exit {{ c.exit_code }}</span>
+    {% endif %}
     {% if c.cpu_pct is not none %}
     <span style="font-size:0.72rem;color:var(--text-muted);font-family:ui-monospace,monospace;flex-shrink:0;">
       {{ "%.1f" | format(c.cpu_pct) }}%