(ui) Extend page headers across utility views

Apply the shared page-header pattern to configuration, access,
operations, retention, log, and changelog pages so the control panel
uses one consistent title, context, and action structure.

Add representative view assertions for the new page context on utility
pages.

Refs #28

src/pobsync_backend/templates/pobsync_backend/changelog.html

@@ -3,11 +3,16 @@
 {% block title %}Changelog - pobsync{% endblock %}
 
 {% block content %}
+  <header class="page-header">
+    <div class="page-title">
+      <div class="page-kicker">Release notes</div>
       <h1>Changelog</h1>
-
+      <div class="page-subtitle">Installed release notes rendered from the repository changelog.</div>
+    </div>
     <section class="actions" aria-label="Changelog actions">
       <a class="button-link secondary" href="{% url 'dashboard' %}">Back to dashboard</a>
     </section>
+  </header>
 
   <section class="panel">
     <div class="stack spaced">

src/pobsync_backend/templates/pobsync_backend/global_form.html

@@ -3,11 +3,16 @@
 {% block title %}Global Config{% endblock %}
 
 {% block content %}
+  <header class="page-header">
+    <div class="page-title">
+      <div class="page-kicker">Configuration</div>
       <h1>{% if global_config %}Global Config{% else %}Create Global Config{% endif %}</h1>
-
+      <div class="page-subtitle">Defaults used by hosts unless a host overrides them explicitly.</div>
+    </div>
     <section class="actions" aria-label="Global config actions">
       <a class="button-link" href="{% url 'dashboard' %}">Back to dashboard</a>
     </section>
+  </header>
 
   <section class="panel">
     <h2>{% if global_config %}Edit Global Config{% else %}Create Global Config{% endif %}</h2>

src/pobsync_backend/templates/pobsync_backend/host_form.html

@@ -3,8 +3,12 @@
 {% block title %}{% if host %}Config | {{ host.host }}{% else %}New Host{% endif %}{% endblock %}
 
 {% block content %}
+  <header class="page-header">
+    <div class="page-title">
+      <div class="page-kicker">Configuration</div>
       <h1>{% if host %}Config: {{ host.host }}{% else %}New Host{% endif %}</h1>
-
+      <div class="page-subtitle">Host-specific backup, retention, SSH, include, and exclude settings.</div>
+    </div>
     <section class="actions" aria-label="Config actions">
       {% if host %}
         <a class="button-link" href="{% url 'host_detail' host.host %}">Back to host</a>
@@ -12,6 +16,7 @@
         <a class="button-link" href="{% url 'dashboard' %}">Back to dashboard</a>
       {% endif %}
     </section>
+  </header>
 
   <section class="panel">
     <h2>{% if host %}Edit Host Config{% else %}Create Host Config{% endif %}</h2>

src/pobsync_backend/templates/pobsync_backend/logs.html

@@ -3,11 +3,16 @@
 {% block title %}Logs | pobsync{% endblock %}
 
 {% block content %}
+  <header class="page-header">
+    <div class="page-title">
+      <div class="page-kicker">Operations</div>
       <h1>Logs</h1>
-
+      <div class="page-subtitle">Filter pobsync service logs by unit, priority, host, run, or message content.</div>
+    </div>
     <section class="actions" aria-label="Log actions">
       <a class="button-link secondary" href="{% url 'dashboard' %}">Back to dashboard</a>
     </section>
+  </header>
 
   <section class="panel">
     <h2>Filter</h2>

src/pobsync_backend/templates/pobsync_backend/purged_snapshots.html

@@ -3,11 +3,16 @@
 {% block title %}Purged Snapshots | pobsync{% endblock %}
 
 {% block content %}
+  <header class="page-header">
+    <div class="page-title">
+      <div class="page-kicker">Retention</div>
       <h1>Purged Snapshots</h1>
-
+      <div class="page-subtitle">Audit trail for snapshots removed by retention or manual purge actions.</div>
+    </div>
     <section class="actions" aria-label="Purged snapshot actions">
       <a class="button-link secondary" href="{% url 'dashboard' %}">Back to dashboard</a>
     </section>
+  </header>
 
   <section class="panel">
     <h2>Filters</h2>

src/pobsync_backend/templates/pobsync_backend/schedule_form.html

@@ -3,11 +3,16 @@
 {% block title %}Schedule | {{ host.host }}{% endblock %}
 
 {% block content %}
-  <h1>Schedule: {{ host.host }}</h1>
-
+  <header class="page-header">
+    <div class="page-title">
+      <div class="page-kicker">Schedule</div>
+      <h1>{{ host.host }}</h1>
+      <div class="page-subtitle">Automatic backup timing and scheduled prune behavior for this host.</div>
+    </div>
     <section class="actions" aria-label="Schedule actions">
       <a class="button-link" href="{% url 'host_detail' host.host %}">Back to host</a>
     </section>
+  </header>
 
   <section class="panel">
     <h2>{% if schedule %}Edit Schedule{% else %}Create Schedule{% endif %}</h2>

src/pobsync_backend/templates/pobsync_backend/self_check.html

@@ -3,11 +3,16 @@
 {% block title %}Self Check | pobsync{% endblock %}
 
 {% block content %}
+  <header class="page-header">
+    <div class="page-title">
+      <div class="page-kicker">Operations</div>
       <h1>Self Check</h1>
-
+      <div class="page-subtitle">Runtime, filesystem, service, and configuration checks for this pobsync installation.</div>
+    </div>
     <section class="actions" aria-label="Self check actions">
       <a class="button-link secondary" href="{% url 'dashboard' %}">Back to dashboard</a>
     </section>
+  </header>
 
   <section class="grid" aria-label="Self check summary">
     <div class="metric"><div class="label">OK</div><div class="value">{{ summary.ok }}</div></div>

src/pobsync_backend/templates/pobsync_backend/ssh_credential_form.html

@@ -3,11 +3,16 @@
 {% block title %}{% if credential %}SSH Key | {{ credential.name }}{% else %}New SSH Key{% endif %} | pobsync{% endblock %}
 
 {% block content %}
+  <header class="page-header">
+    <div class="page-title">
+      <div class="page-kicker">Access</div>
       <h1>{% if credential %}SSH Key: {{ credential.name }}{% else %}New SSH Key{% endif %}</h1>
-
+      <div class="page-subtitle">{% if credential %}Review key metadata, known hosts, and deletion safety for this credential.{% else %}Register an existing private key for use by pobsync backups.{% endif %}</div>
+    </div>
     <section class="actions" aria-label="SSH key form actions">
       <a class="button-link" href="{% url 'ssh_credentials' %}">Back to SSH keys</a>
     </section>
+  </header>
 
   <section class="panel">
     <h2>{% if credential %}Edit SSH Credential{% else %}Create SSH Credential{% endif %}</h2>

src/pobsync_backend/templates/pobsync_backend/ssh_credential_generate.html

@@ -3,11 +3,16 @@
 {% block title %}Generate SSH Key | pobsync{% endblock %}
 
 {% block content %}
+  <header class="page-header">
+    <div class="page-title">
+      <div class="page-kicker">Access</div>
       <h1>Generate SSH Key</h1>
-
+      <div class="page-subtitle">Create a pobsync-managed SSH key pair for one or more backup targets.</div>
+    </div>
     <section class="actions" aria-label="SSH key form actions">
       <a class="button-link" href="{% url 'ssh_credentials' %}">Back to SSH keys</a>
     </section>
+  </header>
 
   <section class="panel">
     <h2>Create Key Pair</h2>

src/pobsync_backend/templates/pobsync_backend/ssh_credentials.html

@@ -3,13 +3,18 @@
 {% block title %}SSH Keys | pobsync{% endblock %}
 
 {% block content %}
+  <header class="page-header">
+    <div class="page-title">
+      <div class="page-kicker">Access</div>
       <h1>SSH Keys</h1>
-
+      <div class="page-subtitle">Manage the key pairs pobsync uses to reach backup targets.</div>
+    </div>
     <section class="actions" aria-label="SSH key actions">
       <a class="button-link" href="{% url 'generate_ssh_credential' %}">Generate SSH key</a>
       <a class="button-link secondary" href="{% url 'create_ssh_credential' %}">Add existing key</a>
       <a class="button-link secondary" href="{% url 'dashboard' %}">Back to dashboard</a>
     </section>
+  </header>
 
   <section class="panel">
     <h2>Credentials</h2>

src/pobsync_backend/tests/test_views.py

@@ -295,6 +295,7 @@ class ViewTests(TestCase):
 
         self.assertEqual(response.status_code, 200)
         self.assertContains(response, "Self Check")
+        self.assertContains(response, "Runtime, filesystem, service, and configuration checks")
         self.assertContains(response, "Django debug")
         self.assertContains(response, "Database connection")
         self.assertContains(response, "State root")
@@ -329,6 +330,7 @@ class ViewTests(TestCase):
 
         self.assertEqual(response.status_code, 200)
         self.assertContains(response, "Logs")
+        self.assertContains(response, "Filter pobsync service logs")
         self.assertContains(response, "web-01 failed backup run 12")
         self.assertNotContains(response, "web-02 failed backup run 12")
         self.assertNotContains(response, "started")
@@ -358,6 +360,7 @@ class ViewTests(TestCase):
 
         self.assertEqual(response.status_code, 200)
         self.assertContains(response, "Purged Snapshots")
+        self.assertContains(response, "Audit trail for snapshots removed")
         self.assertContains(response, "20260518-021500Z__OLDSNAP")
         self.assertContains(response, "outside retention policy")
         self.assertContains(response, "Scheduled")
@@ -412,6 +415,7 @@ class ViewTests(TestCase):
             )
 
         self.assertRedirects(response, reverse("ssh_credentials"))
+        self.assertContains(response, "Manage the key pairs pobsync uses")
         self.assertContains(response, "SSH credential saved for backup-key.")
         self.assertContains(response, "backup-key")
         credential = SshCredential.objects.get(name="backup-key")
@@ -641,6 +645,7 @@ class ViewTests(TestCase):
         response = self.client.get(reverse("edit_global_config"))
 
         self.assertEqual(response.status_code, 200)
+        self.assertContains(response, "Defaults used by hosts unless a host overrides them")
         self.assertContains(response, f'value="{credential.id}" selected')
         self.assertContains(response, "--archive")
         self.assertContains(response, "/proc/***")
@@ -2031,6 +2036,7 @@ class ViewTests(TestCase):
         response = self.client.get(reverse("edit_host_schedule", args=[host.host]))
 
         self.assertEqual(response.status_code, 200)
+        self.assertContains(response, "Automatic backup timing and scheduled prune behavior")
         self.assertContains(response, "Create Schedule")
         self.assertContains(response, "Schedule expression")
         self.assertContains(response, "evaluated by the pobsync scheduler service")