feat(ui): show current commit version and date in admin sidebar

public/admin.js

@@ -77,10 +77,26 @@ function buildSidebar(active) {
       ${nav.map(n => `<a href="${n.page}.html" data-nav="${n.page}" class="${n.page === active ? 'active' : ''}"><i data-lucide="${n.icon}"></i>${n.label}</a>`).join('')}
     </nav>
     <div class="bottom">
+      <div class="version" id="sidebarVersion"></div>
       <a href="/" data-nav="home"><i data-lucide="home"></i>На главную</a>
       <a class="logout" href="#" data-action="logout"><i data-lucide="log-out"></i>Выйти</a>
     </div>`;
   renderIcons();
+  loadVersion();
+}
+
+async function loadVersion() {
+  const el = document.getElementById('sidebarVersion');
+  if (!el) return;
+  try {
+    const res = await fetch(`${API}/version.json?t=${Date.now()}`);
+    if (!res.ok) { el.textContent = ''; return; }
+    const v = await res.json();
+    if (!v.short) { el.textContent = ''; return; }
+    const d = (v.date || '').slice(0, 10);
+    el.textContent = `v${v.short}${d ? ' · ' + d : ''}`;
+    el.title = `${v.short} · ${v.date || ''}`;
+  } catch { el.textContent = ''; }
 }
 
 // --- Common UI ---