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>

types/index.ts

@@ -12,9 +12,9 @@ export interface TrumpPost {
   relevant: boolean
   price_impact: {
     asset: 'BTC' | 'ETH'
-    m5: number
-    m15: number
-    m1h: number
+    m5: number | null    // null = window still open (live rolling peak pending)
+    m15: number | null
+    m1h: number | null
     price_at_post: number
     correct_m5: boolean | null
     correct_m15: boolean | null