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>

app/[locale]/contact/page.tsx

@@ -0,0 +1,46 @@
+export default function ContactPage() {
+  return (
+    <div className="page" style={{ maxWidth: 560 }}>
+      <div className="page-head">
+        <div>
+          <h1 className="page-title">Contact Us</h1>
+          <p className="page-sub">Questions, feedback, or support requests.</p>
+        </div>
+      </div>
+
+      <div className="card" style={{ padding: 32 }}>
+        <form
+          action="mailto:support@bitnews.day"
+          method="get"
+          encType="text/plain"
+        >
+          <div className="field" style={{ marginBottom: 16 }}>
+            <label htmlFor="subject">Subject</label>
+            <input id="subject" name="subject" type="text" placeholder="e.g. Bot not executing trades" />
+          </div>
+          <div className="field" style={{ marginBottom: 24 }}>
+            <label htmlFor="body">Message</label>
+            <textarea
+              id="body"
+              name="body"
+              rows={6}
+              placeholder="Describe your issue or question in detail…"
+              style={{ width: '100%', resize: 'vertical' }}
+            />
+          </div>
+          <button type="submit" className="btn amber lg">
+            Open in mail client →
+          </button>
+        </form>
+
+        <div style={{ marginTop: 28, paddingTop: 20, borderTop: '1px solid var(--line)', fontSize: 13, color: 'var(--ink-3)', lineHeight: 1.6 }}>
+          <div style={{ marginBottom: 6 }}>You can also reach us directly:</div>
+          <div>
+            <a href="mailto:support@bitnews.day" style={{ color: 'var(--amber)' }}>support@bitnews.day</a>
+          </div>
+          <div style={{ marginTop: 8 }}>Response time: typically within 24 hours.</div>
+        </div>
+      </div>
+    </div>
+  )
+}