feat: complete MDX migration for blog, fix diagram fidelity and refactor styling architecture

apps/web/mdx-components.tsx

@@ -0,0 +1,11 @@
+// import type { MDXComponents } from 'mdx/types'; // Commented out due to resolution issue
+import { mdxComponents as registryComponents } from './src/content-engine/registry';
+
+export const MDXComponents = registryComponents;
+
+export function useMDXComponents(components: any): any {
+    return {
+        ...components,
+        ...registryComponents,
+    };
+}