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/dashboard/SideNav.jsx

@@ -0,0 +1,39 @@
+function SideNav({ active, onNav }) {
+  const items = [
+    { id: 'events', icon: 'calendar', label: 'Events', badge: '12' },
+    { id: 'live', icon: 'radio', label: 'Race control', badge: '1' },
+    { id: 'results', icon: 'trophy', label: 'Results' },
+    { id: 'participants', icon: 'users', label: 'Participants' },
+    { id: 'mats', icon: 'route', label: 'Timing mats' },
+    { id: 'reports', icon: 'bar-chart-3', label: 'Reports' },
+  ];
+  const settings = [
+    { id: 'team', icon: 'user-cog', label: 'Team' },
+    { id: 'billing', icon: 'credit-card', label: 'Billing' },
+    { id: 'settings', icon: 'settings', label: 'Settings' },
+  ];
+  return (
+    <aside className="kit-side">
+      <div className="kit-side-section">Operations</div>
+      {items.map(it => (
+        <div key={it.id} className={'kit-nav-item' + (active === it.id ? ' active' : '')} onClick={() => onNav(it.id)}>
+          <i data-lucide={it.icon}></i>
+          <span>{it.label}</span>
+          {it.badge && <span className="badge">{it.badge}</span>}
+        </div>
+      ))}
+      <div className="kit-side-section">Account</div>
+      {settings.map(it => (
+        <div key={it.id} className={'kit-nav-item' + (active === it.id ? ' active' : '')} onClick={() => onNav(it.id)}>
+          <i data-lucide={it.icon}></i>
+          <span>{it.label}</span>
+        </div>
+      ))}
+      <div style={{ flex: 1 }}></div>
+      <div style={{ padding: 14, borderTop: '1px solid var(--hairline)', fontFamily: 'var(--font-mono)', fontSize: 10, color: 'var(--ink-4)', letterSpacing: '0.06em', textTransform: 'uppercase' }}>
+        v3.18.0 · build 2741
+      </div>
+    </aside>
+  );
+}
+window.SideNav = SideNav;