Refactor routing in App component to enhance navigation and improve error handling by integrating dynamic routes and updating the NotFound route.

node_modules/astro/dist/vite-plugin-astro-server/base.d.ts

@@ -0,0 +1,4 @@
+import type * as vite from 'vite';
+import type { AstroSettings } from '../@types/astro.js';
+import type { Logger } from '../core/logger/core.js';
+export declare function baseMiddleware(settings: AstroSettings, logger: Logger): vite.Connect.NextHandleFunction;