feat: add nav bar button to publish pending config changes

Shows an orange "Publish Config" button to the left of the alert-pie
for admin users when there are staged config changes. Uses localStorage
to persist staged changes across page navigations so the button appears
on any page, not just settings.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

hbd/server/templates/head.html

@@ -125,6 +125,23 @@
         .nav-links a { margin-right: 0; padding: 6px 0; font-size: 1em; }
       }
 
+      /* Pending config publish button */
+      .nav-publish-btn {
+        background: #e65100;
+        color: #fff;
+        border: none;
+        border-radius: 4px;
+        padding: 4px 10px;
+        font-size: 0.82em;
+        font-weight: 600;
+        cursor: pointer;
+        flex-shrink: 0;
+        white-space: nowrap;
+        margin-left: auto;
+      }
+      .nav-publish-btn:hover { background: #bf360c; }
+      .nav-publish-btn:disabled { opacity: 0.7; cursor: default; }
+
       /* Swiss railway clock — nav */
       .nav-pie {
         flex-shrink: 0;

hbd/server/templates/nav.html

@@ -11,6 +11,9 @@
     {% endif %}
     <a href="/about"{% if active_page == "about" %} class="active"{% endif %}>About</a>
   </div>
+  {% if current_user and current_user.admin %}
+  <button id="nav-publish-btn" class="nav-publish-btn" onclick="navPublishConfig()" style="display:none" title="Publish pending config changes to .hb.yaml">&#9888; Publish Config</button>
+  {% endif %}
   <div class="nav-pie" title="Host alert status">
     <canvas id="alert-pie" width="44" height="44"></canvas>
   </div>
@@ -92,5 +95,40 @@
   document.addEventListener('DOMContentLoaded', function() {
     updateAlertPie();
     setInterval(updateAlertPie, 30000);
+    navCheckPendingConfig();
+    window.addEventListener('storage', navCheckPendingConfig);
   });
+
+  function navCheckPendingConfig() {
+    var btn = document.getElementById('nav-publish-btn');
+    if (!btn) return;
+    btn.style.display = localStorage.getItem('hbd_pending_config') ? '' : 'none';
+  }
+
+  async function navPublishConfig() {
+    var btn = document.getElementById('nav-publish-btn');
+    var pending = localStorage.getItem('hbd_pending_config');
+    if (!pending) return;
+    var staged;
+    try { staged = JSON.parse(pending); } catch(e) { return; }
+    if (btn) { btn.disabled = true; btn.textContent = 'Saving…'; }
+    try {
+      var resp = await fetch('/api/0/config', {
+        method: 'POST',
+        headers: {'Content-Type': 'application/json'},
+        body: pending
+      });
+      if (resp.ok) {
+        localStorage.removeItem('hbd_pending_config');
+        window.location.reload();
+      } else {
+        var err = await resp.json().catch(function() { return {}; });
+        alert('Error: ' + (err.error || resp.statusText));
+        if (btn) { btn.disabled = false; btn.textContent = '⚠ Publish Config'; }
+      }
+    } catch(e) {
+      alert('Network error: ' + e.message);
+      if (btn) { btn.disabled = false; btn.textContent = '⚠ Publish Config'; }
+    }
+  }
 </script>

hbd/server/templates/settings.html

@@ -871,9 +871,13 @@
         if (count > 0) {
           document.getElementById('pending-count').textContent = count;
           banner.style.display = 'flex';
+          localStorage.setItem('hbd_pending_config', JSON.stringify(_staged));
         } else {
           banner.style.display = 'none';
+          localStorage.removeItem('hbd_pending_config');
         }
+        const navBtn = document.getElementById('nav-publish-btn');
+        if (navBtn) navBtn.style.display = count > 0 ? '' : 'none';
       }
 
       function stageFormSection(sectionId, apiSection) {
@@ -1050,6 +1054,7 @@
 
       function discardAll() {
         Object.keys(_staged).forEach(k => delete _staged[k]);
+        localStorage.removeItem('hbd_pending_config');
         updatePendingBanner();
         window.location.reload();
       }