**Design System Enhancements:** Replace .md links with clean paths in /dev documentation. Migrate anchor tags (<a>) to Next.js <Link> components for internal navigation. Add dynamic [...slug] markdown route for rendering docs. Introduce MarkdownContent for styled markdown rendering with syntax highlighting. Perform general cleanup of unused imports and variables in design system files. Fix minor wording issues.

frontend/src/app/dev/page.tsx

@@ -70,22 +70,22 @@ const documentationLinks = [
   {
     title: 'Quick Start',
     description: '5-minute crash course',
-    href: '/docs/design-system/00-quick-start.md',
+    href: '/docs/design-system/00-quick-start',
   },
   {
     title: 'Complete Documentation',
     description: 'Full design system guide',
-    href: '/docs/design-system/README.md',
+    href: '/docs/design-system/README',
   },
   {
     title: 'AI Guidelines',
     description: 'Rules for AI code generation',
-    href: '/docs/design-system/08-ai-guidelines.md',
+    href: '/docs/design-system/08-ai-guidelines',
   },
   {
     title: 'Quick Reference',
     description: 'Cheat sheet for lookups',
-    href: '/docs/design-system/99-reference.md',
+    href: '/docs/design-system/99-reference',
   },
 ];
 
@@ -190,11 +190,9 @@ export default function DesignSystemHub() {
 
             <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-4">
               {documentationLinks.map((link) => (
-                <a
+                <Link
                   key={link.href}
                   href={link.href}
-                  target="_blank"
-                  rel="noopener noreferrer"
                   className="group"
                 >
                   <Card className="h-full transition-all hover:border-primary/50 hover:bg-accent/50">
@@ -207,7 +205,7 @@ export default function DesignSystemHub() {
                       </CardDescription>
                     </CardHeader>
                   </Card>
-                </a>
+                </Link>
               ))}
             </div>
           </section>