docs: import TRM design handoff + defer adoption to phase 3.8

A design handoff bundle generated by Claude Design (claude.ai/design)
on 2026-05-02. Defines the Bloomberg/F1-pit-wall aesthetic for TRM:
- ink-on-paper base + race-flag red accent (#E8412B)
- square-edged everything, sharp printed offset shadows
- mono numerics (JetBrains Mono) for any changing value
- Goldplay (real licensed font, three weights in bundle fonts/)
- four surfaces designed: dashboard / leaderboard / mobile / marketing
  (SPA scope is the first two)

The bundle is committed in-tree at TRM_Design_System-handoff/ so 3.8
has the full source material when it picks the work up. Includes:
- Top-level + project READMEs (the design spec)
- chats/chat1.md (intent + iteration history)
- colors_and_type.css (token set, drop-in for Tailwind 4 @theme)
- fonts/ (Goldplay regular/semibold/bold)
- ui_kits/ (HTML prototypes per surface)
- preview/ (per-token visual reference cards)

Updated phase-3-dogfood-readiness/README.md task 3.8 row to point at
the bundle and document the recommended approach (retheme shadcn via
CSS variable overrides + Tailwind 4 @theme, not replace).

Why deferred: foundational tokens are non-blocking for Phase 1 (login
+ placeholder home) and Phase 2 (live map without chrome). Applying
them now would either delay dogfood-blocking work or land partial
styling that gets reworked when 3.8 lands the full pass.

TRM_Design_System-handoff/trm-design-system/project/ui_kits/mobile/BottomNav.jsx

@@ -0,0 +1,21 @@
+function BottomNav({ active, onNav }) {
+  const items = [
+    { id: 'race',  label: 'My race',   icon: 'M12 2v4 M12 18v4 M2 12h4 M18 12h4' },
+    { id: 'follow',label: 'Following', icon: 'M17 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2 M9 11a4 4 0 1 0 0-8 4 4 0 0 0 0 8 M23 21v-2a4 4 0 0 0-3-3.87 M16 3.13a4 4 0 0 1 0 7.75' },
+    { id: 'find',  label: 'Find',      icon: 'M11 19a8 8 0 1 0 0-16 8 8 0 0 0 0 16 M21 21l-4.35-4.35' },
+    { id: 'me',    label: 'Profile',   icon: 'M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2 M12 11a4 4 0 1 0 0-8 4 4 0 0 0 0 8' },
+  ];
+  return (
+    <div style={{ display: 'grid', gridTemplateColumns: 'repeat(4, 1fr)', borderTop: '1px solid var(--ink)', background: 'var(--paper)' }}>
+      {items.map(it => (
+        <div key={it.id} onClick={() => onNav(it.id)} style={{ padding: '10px 0 6px', textAlign: 'center', cursor: 'pointer', borderTop: active === it.id ? '2px solid var(--flag)' : '2px solid transparent', marginTop: -1 }}>
+          <svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke={active === it.id ? 'var(--flag)' : 'var(--ink-3)'} strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" style={{ display: 'block', margin: '0 auto' }}>
+            {it.icon.split(' M').map((d, i) => <path key={i} d={(i === 0 ? '' : 'M') + d} />)}
+          </svg>
+          <div style={{ fontFamily: 'var(--font-display)', fontSize: 10, fontWeight: 600, letterSpacing: '0.06em', textTransform: 'uppercase', marginTop: 4, color: active === it.id ? 'var(--flag)' : 'var(--ink-3)' }}>{it.label}</div>
+        </div>
+      ))}
+    </div>
+  );
+}
+window.BottomNav = BottomNav;