fix(auto-update): CI failures on Linux

- Keep the setup result when chown fails. CI runs as a non-root user, where
  chown to the web user raises; that discarded the result file, so the
  General tab would never learn whether setup worked. Regression test added.
- Register the two new /api/v3/system/auto-update routes in the URL map
  snapshot.
- Use utility classes app.css defines (space-y-1, hover:text-red-600).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/auto_update_setup.py

@@ -195,7 +195,12 @@ class UpdateHelperSetup:
                 json.dump(result, f, indent=2)
             os.chmod(tmp, 0o644)
             if self._web_ids and hasattr(os, 'chown'):
-                os.chown(tmp, *self._web_ids)
+                # Only root can give the file away; the result is readable
+                # (0644) either way, so a failed chown must not lose it.
+                try:
+                    os.chown(tmp, *self._web_ids)
+                except OSError:
+                    pass
             os.replace(tmp, self.result_file)
         except OSError as e:
             logger.warning("Could not record automatic update setup result: %s", e)

test/fixtures/api_v3_url_map.json

@@ -841,6 +841,23 @@
       "POST"
     ]
   ],
+  [
+    "/api/v3/system/auto-update",
+    "api_v3.get_auto_update_status",
+    [
+      "GET",
+      "HEAD",
+      "OPTIONS"
+    ]
+  ],
+  [
+    "/api/v3/system/auto-update/dismiss",
+    "api_v3.dismiss_auto_update_alert",
+    [
+      "OPTIONS",
+      "POST"
+    ]
+  ],
   [
     "/api/v3/system/check-update",
     "api_v3.check_for_update",

test/test_auto_update_setup.py

@@ -167,3 +167,16 @@ def test_not_a_systemd_host_is_left_alone(tmp_path):
     systemctl = FakeSystemctl()
     assert setup(root, tmp_path / 'no-etc', systemctl).ensure(ON) is None
     assert systemctl.calls == []
+
+
+def test_the_result_is_kept_when_it_cannot_be_given_to_the_web_user(tmp_path, monkeypatch):
+    """Caught by CI, which runs as a non-root Linux user: chown needs root, and
+    a failed chown used to discard the result, so the General tab never
+    learned whether setup worked."""
+    def refuse(*args):
+        raise PermissionError('Operation not permitted')
+    monkeypatch.setattr(aus.os, 'chown', refuse, raising=False)
+    root, etc = project(tmp_path)
+    out = setup(root, etc, FakeSystemctl()).ensure(ON)
+    assert out['status'] == 'installed'
+    assert result(root) == out

web_interface/templates/v3/partials/general.html

@@ -70,7 +70,7 @@
             <p class="mt-1 ml-6 text-xs text-blue-700">An update was just installed and its health check is running.</p>
             {% endif %}
             {% if auto_update_status and (auto_update_status.last_run or auto_update_status.next_due) %}
-            <div class="mt-1 ml-6 text-xs text-gray-500 space-y-0.5">
+            <div class="mt-1 ml-6 text-xs text-gray-500 space-y-1">
                 {% if auto_update_status.last_run %}
                 <p>Last automatic update: {{ auto_update_status.last_run }}
                    <span class="{{ 'text-red-600' if auto_update_status.status == 'error' else '' }}">— {{ auto_update_status.summary }}</span></p>

web_interface/templates/v3/partials/overview.html

@@ -8,7 +8,7 @@
         <p class="text-sm text-red-700 mt-1" id="auto-update-banner-text"></p>
         <p class="text-xs text-red-600 mt-1">Details are under Automatic Updates on the General tab.</p>
     </div>
-    <button type="button" onclick="window.dismissAutoUpdateBanner()" class="ml-4 flex-shrink-0 text-red-500 hover:text-red-700" aria-label="Dismiss">
+    <button type="button" onclick="window.dismissAutoUpdateBanner()" class="ml-4 flex-shrink-0 text-red-500 hover:text-red-600" aria-label="Dismiss">
         <i class="fas fa-times"></i>
     </button>
 </div>