feat: revamp dashboard, trades, and add landing/legal pages

- Major UI updates across dashboard, analytics, posts, trades, settings
- New landing page, robots/sitemap, contact/privacy/terms pages
- Updated globals.css with extensive styling and new landing.css
- Refactor signedRequest, realtime data hook, and dashboard store

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

middleware.ts

@@ -4,10 +4,11 @@ import { locales, defaultLocale } from './i18n'
 export default createMiddleware({
   locales,
   defaultLocale,
+  localePrefix: 'always',
 })
 
 export const config = {
-  matcher: [
-    '/((?!api|_next/static|_next/image|favicon.ico|.*\\..*).*)' ,
-  ],
+  // Only match locale-prefixed routes. `/` is served by `app/page.tsx`
+  // (the landing page) and must not be intercepted by the i18n middleware.
+  matcher: ['/(en)/:path*'],
 }