feat: add mobile tab bar navigation

src/app/layout.tsx

@@ -4,6 +4,7 @@ import "./globals.css";
 import { ThemeProvider } from "@/contexts/theme-context";
 import { WebVitals } from "@/components/analytics/web-vitals";
 import { OrganizationSchema, WebsiteSchema } from "@/components/seo/structured-data";
+import { MobileTabBar } from "@/components/layout/mobile-tab-bar";
 
 const geistSans = Geist({
   variable: "--font-geist-sans",
@@ -145,6 +146,7 @@ export default function RootLayout({
         <ThemeProvider>
           {children}
         </ThemeProvider>
+        <MobileTabBar />
       </body>
     </html>
   );