fix(docker): drop the unused .w-meter style; the bars test reads the loaded plugin's models (#5214)

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

tests/integration/test_docker_recent_usage.py

@@ -4,6 +4,7 @@ time bucket in one query (#5214). Two samples share a bucket and must merge
 from __future__ import annotations
 
 import asyncio
+import importlib
 import os
 import uuid
 from datetime import datetime, timedelta, timezone
@@ -21,10 +22,20 @@ def app():
     return create_app(testing=False)
 
 
+def _docker(sub):
+    """The app's loaded docker plugin module: importing plugins.docker.models a
+    second time raises "Table already defined" (see test_mcp_plugin_tools)."""
+    from steward.core.plugin_manager import get_loaded_plugin_modules
+    loaded = get_loaded_plugin_modules().get("docker")
+    base = loaded.__name__ if loaded is not None else "plugins.docker"
+    return importlib.import_module(f"{base}.{sub}")
+
+
 def test_recent_usage_averages_each_containers_bucket(app):
-    from plugins.docker.models import DockerMetric
-    from plugins.docker.service import bar_slots, recent_usage
     from steward.models.hosts import Host
+    DockerMetric = _docker("models").DockerMetric
+    service = _docker("service")
+    bar_slots, recent_usage = service.bar_slots, service.recent_usage
 
     tag = uuid.uuid4().hex[:8]
     hid = str(uuid.uuid4())