Tab the PC detail page, and let a panel say which tab it belongs to

The page had grown to roughly ten cards in one flow, and three more surfaces
were wanted on it: installed software, live metrics, and the service controls.
Stacking those into the same column would have buried what the page is for.

Tabs were mocked and rejected on 2026-08-28, on the grounds that the strip
duplicated the sidebar and cost hero space. That objection is answered by
where the strip sits: the hero and the triage band stay above it and never
move, so "is this machine OK" is still answered without a click, and the strip
partitions the detail underneath rather than navigating anywhere.

WHY A PANEL DECLARES ITS OWN GROUP

Most cards on a detail page are not the page's. They arrive through the
ADR-010 get_asset_panels hook, so a page that sorted panels into tabs by
knowing their ids would defeat the hook it is built on. Panels now carry an
optional group instead, and the page only knows the five group names.

Resolution happens server-side, in the asset-panels route, so that an absent
or misspelled group becomes 'details' before the client ever sees it. The
client renders known groups only; an unrecognised value that survived to it
would be a panel that exists and is displayed nowhere. Contract 0.28.0 ->
0.29.0, additive - every existing plugin keeps working untouched, and the
endpoints status panel is deliberately left ungrouped so the default path is
exercised by a shipped plugin and not only by tests.

A tab is offered only when something fills it. An empty tab reads as broken
rather than as "this site does not collect that", so the strip is built from
the groups that actually returned data, and a tab that disappears on refetch
falls back to Details rather than leaving the page blank.

AssetDetailTabs is core, not a PCDetail component: machines, printers,
network devices and measuring tools all have the same shape, and the shared
asset-detail shell they need starts here.

Scope: product

tests/test_core/test_pluginui.py

@@ -142,3 +142,86 @@ def test_asset_presentation_skip_disabled_plugin(app, client, auth_headers, monk
 
     entries = _data(client, '/api/pluginui/asset-presentation', auth_headers)
     assert 'measuring_tool' not in {e.get('assettype') for e in entries}
+
+
+# =============================================================================
+# asset-panel groups (which detail-page tab a panel lands in)
+# =============================================================================
+
+def test_every_panel_comes_back_with_a_group(app, client, db, auth_headers,
+                                             monkeypatch):
+    """The client filters by group, so a panel without one must not vanish.
+
+    Resolution happens on the server precisely so a plugin written before tabs
+    existed still lands somewhere a person can see.
+    """
+    from shopdb.core.api.pluginui import ASSET_PANEL_GROUPS
+    pm = app.extensions['plugin_manager']
+    monkeypatch.setattr(pm.registry, 'is_enabled', lambda name: True)
+    assetid = _make_asset(db)
+
+    panels = _data(client, '/api/pluginui/asset-panels?assetid=%d' % assetid,
+                   auth_headers)
+    assert panels, 'no panels matched, so this test proves nothing'
+    for panel in panels:
+        assert panel.get('group') in ASSET_PANEL_GROUPS, panel.get('id')
+
+
+def test_an_undeclared_group_defaults_to_details(app, client, db, auth_headers,
+                                                 monkeypatch):
+    """Omitting group is the documented answer for most panels."""
+    pm = app.extensions['plugin_manager']
+    monkeypatch.setattr(pm.registry, 'is_enabled', lambda name: True)
+    plugin = next(iter(pm.get_all_plugins().values()))
+    monkeypatch.setattr(plugin, 'get_asset_panels', lambda: [{
+        'id': 'nogroup', 'title': 'No group', 'assettypes': ['*'],
+        'endpoint': '/api/whatever', 'render': 'keyvalue', 'position': 1,
+    }])
+    assetid = _make_asset(db)
+
+    panels = _data(client, '/api/pluginui/asset-panels?assetid=%d' % assetid,
+                   auth_headers)
+    panel = next(p for p in panels if p['id'] == 'nogroup')
+    assert panel['group'] == 'details'
+
+
+def test_a_group_nobody_defined_falls_back_rather_than_disappearing(
+        app, client, db, auth_headers, monkeypatch):
+    """A typo must not drop the panel off every tab.
+
+    The page renders known groups only, so an unrecognised value that survived
+    to the client would be a panel that exists and is never shown anywhere.
+    """
+    pm = app.extensions['plugin_manager']
+    monkeypatch.setattr(pm.registry, 'is_enabled', lambda name: True)
+    plugin = next(iter(pm.get_all_plugins().values()))
+    monkeypatch.setattr(plugin, 'get_asset_panels', lambda: [{
+        'id': 'typo', 'title': 'Typo', 'assettypes': ['*'],
+        'endpoint': '/api/whatever', 'render': 'keyvalue', 'position': 1,
+        'group': 'metrcis',
+    }])
+    assetid = _make_asset(db)
+
+    panels = _data(client, '/api/pluginui/asset-panels?assetid=%d' % assetid,
+                   auth_headers)
+    panel = next(p for p in panels if p['id'] == 'typo')
+    assert panel['group'] == 'details'
+
+
+def test_group_matching_is_not_case_or_space_sensitive(app, client, db,
+                                                       auth_headers, monkeypatch):
+    """'Metrics ' is obviously meant to be metrics; do not send it to details."""
+    pm = app.extensions['plugin_manager']
+    monkeypatch.setattr(pm.registry, 'is_enabled', lambda name: True)
+    plugin = next(iter(pm.get_all_plugins().values()))
+    monkeypatch.setattr(plugin, 'get_asset_panels', lambda: [{
+        'id': 'shouty', 'title': 'Shouty', 'assettypes': ['*'],
+        'endpoint': '/api/whatever', 'render': 'keyvalue', 'position': 1,
+        'group': '  Metrics ',
+    }])
+    assetid = _make_asset(db)
+
+    panels = _data(client, '/api/pluginui/asset-panels?assetid=%d' % assetid,
+                   auth_headers)
+    panel = next(p for p in panels if p['id'] == 'shouty')
+    assert panel['group'] == 'metrics'