Wave 2 (#4, #5, #6): nav restructure + scheduling, landscape, AI-Edit state preservation

vite.config.ts

@@ -18,7 +18,7 @@ export default defineConfig({
         theme_color: '#0f766e',
         background_color: '#15181e',
         display: 'standalone',
-        orientation: 'portrait',
+        orientation: 'any',
         start_url: '.',
         icons: [
           { src: 'pwa-192x192.png', sizes: '192x192', type: 'image/png' },