feat(sprint-5.5): add "Save version" button, update navigation block and block components

- Add "Сохранить версию" button to BlockMetaBar that persists current
  version + changelog from code to PostgreSQL via PATCH API
- Update navigation page: menu items section now renders like live example
  with underlined links, hover dropdowns, and submenus
- Restore uncommitted changes from previous session (thirsty-mayer worktree):
  navigation v1.3 with dropdowns, updated hero/ceo/doctors/reviews/news/
  contact-forms/footer blocks, navData.ts extraction, seed updates
- Extract nav menu data to shared navData.ts module

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/web/components/ui/BlockMetaBar.tsx

@@ -37,6 +37,7 @@ export function BlockMetaBar({ path, defaultVersion, defaultIsInPreview, default
   const [editing, setEditing] = useState(false);
   const [versionInput, setVersionInput] = useState(defaultVersion);
   const [saving, setSaving] = useState(false);
+  const [savingVersion, setSavingVersion] = useState<false | 'saving' | 'done'>(false);
   const [togglingPreview, setTogglingPreview] = useState(false);
   const [apiDown, setApiDown] = useState(false);
   const [localPreview, setLocalPreview] = useState(defaultIsInPreview);
@@ -79,6 +80,22 @@ export function BlockMetaBar({ path, defaultVersion, defaultIsInPreview, default
     }
   }
 
+  async function saveFullVersion() {
+    if (apiDown) return;
+    setSavingVersion('saving');
+    try {
+      const updated = await patch({ version: defaultVersion, changelog: defaultChangelog });
+      if (updated) {
+        setMeta(updated);
+        setVersionInput(updated.version);
+      }
+      setSavingVersion('done');
+      setTimeout(() => setSavingVersion(false), 1500);
+    } catch {
+      setSavingVersion(false);
+    }
+  }
+
   async function togglePreview() {
     if (apiDown) {
       const newVal = !localPreview;
@@ -180,6 +197,30 @@ export function BlockMetaBar({ path, defaultVersion, defaultIsInPreview, default
               : "Не в превью"}
         </button>
 
+        <span style={{ color: "var(--bb-border)" }}>·</span>
+
+        {/* Save version button */}
+        <button
+          onClick={saveFullVersion}
+          disabled={apiDown || savingVersion === 'saving'}
+          title={apiDown ? 'API недоступен' : 'Сохранить текущую версию и changelog в БД'}
+          className="px-2.5 py-1 rounded font-medium transition-colors"
+          style={savingVersion === 'done' ? {
+            background: "#dcfce7",
+            color: "#16a34a",
+            border: "1px solid #86efac",
+            cursor: "default",
+          } : {
+            background: "var(--bb-sidebar-bg)",
+            color: apiDown ? "var(--bb-text-muted)" : "var(--brand-053m)",
+            border: "1px solid var(--bb-border)",
+            cursor: apiDown ? "default" : "pointer",
+            opacity: apiDown ? 0.5 : 1,
+          }}
+        >
+          {savingVersion === 'saving' ? '...' : savingVersion === 'done' ? 'Сохранено' : 'Сохранить версию'}
+        </button>
+
         {/* Subtle offline dot instead of "API офлайн" text */}
         {apiDown && (
           <span