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>
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