feat(blog): add file-based blog with dynamic slugs, MDX content and layout shell

- Introduced blog routing using Next.js App Router
- Implemented dynamic [slug] pages for blog posts
- Added MDX-based content loading via lib/posts
- Integrated shared TopBar layout with navigation
- Established clear content, lib and component separation

apps/public-web/node_modules/next/dist/client/page-loader.d.ts

@@ -0,0 +1,44 @@
+import type { ComponentType } from 'react';
+import type { RouteLoader } from './route-loader';
+import type { ProxyMatcher } from '../build/analysis/get-page-static-info';
+declare global {
+    interface Window {
+        __DEV_MIDDLEWARE_MATCHERS?: ProxyMatcher[];
+        __DEV_PAGES_MANIFEST?: {
+            pages: string[];
+        };
+        __SSG_MANIFEST_CB?: () => void;
+        __SSG_MANIFEST?: Set<string>;
+    }
+}
+export type StyleSheetTuple = {
+    href: string;
+    text: string;
+};
+export type GoodPageCache = {
+    page: ComponentType;
+    mod: any;
+    styleSheets: StyleSheetTuple[];
+};
+export default class PageLoader {
+    private buildId;
+    private assetPrefix;
+    private promisedSsgManifest;
+    private promisedDevPagesManifest?;
+    private promisedMiddlewareMatchers?;
+    routeLoader: RouteLoader;
+    constructor(buildId: string, assetPrefix: string);
+    getPageList(): string[] | Promise<string[]>;
+    getMiddleware(): ProxyMatcher[] | Promise<ProxyMatcher[]> | undefined;
+    getDataHref(params: {
+        asPath: string;
+        href: string;
+        locale?: string | false;
+        skipInterpolation?: boolean;
+    }): string;
+    _isSsg(
+    /** the route (file-system path) */
+    route: string): Promise<boolean>;
+    loadPage(route: string): Promise<GoodPageCache>;
+    prefetch(route: string): Promise<void>;
+}