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>

lib/signedRequest.ts

@@ -55,6 +55,25 @@ export interface SignedEnvelope {
  */
 const VIEW_TTL_MS = 4 * 60 * 1000
 
+/**
+ * Read-only: returns a cached, not-yet-expired view envelope if one exists.
+ * Never signs — never triggers a wallet popup. Returns null if no fresh cache.
+ */
+export function getCachedViewEnvelope(action: string, wallet: string): SignedEnvelope | null {
+  if (typeof window === 'undefined') return null
+  const cacheKey = `ts:view:${action}:${wallet.toLowerCase()}`
+  const raw = sessionStorage.getItem(cacheKey)
+  if (!raw) return null
+  try {
+    const env = JSON.parse(raw) as SignedEnvelope
+    if (Date.now() - env.timestamp < VIEW_TTL_MS) return env
+  } catch (err) {
+    console.warn('[signedRequest] corrupt cached envelope, ignoring', err)
+    sessionStorage.removeItem(cacheKey)
+  }
+  return null
+}
+
 export async function getOrCreateViewEnvelope(params: {
   action: string
   wallet: string
@@ -68,7 +87,10 @@ export async function getOrCreateViewEnvelope(params: {
     try {
       const env = JSON.parse(raw) as SignedEnvelope
       if (Date.now() - env.timestamp < VIEW_TTL_MS) return env
-    } catch {}
+    } catch (err) {
+      console.warn('[signedRequest] corrupt cached envelope, ignoring', err)
+      sessionStorage.removeItem(cacheKey)
+    }
   }
   const env = await signRequest({
     action: params.action,