Session 34: Design system Phase C — app shell, nav, routing, auth gate, footer, 404 (1818 tests)

VYNDR 2.0 conversion, Phase C (the frame every page sits inside). Frontend-only;
zero backend changes.

- Nav rewritten: new .wm Wordmark, mono uppercase links, More dropdown, search/
  bell/read-meter/avatar, Ticker under the bar. layout main paddingTop 64 -> 96.
- Routing: web/src/lib/routes.js (GATED/OPEN/HASH_ALIASES, isGatedRoute,
  resolveHashAlias). Client AuthGate bounces signed-out users off personal
  routes to /login?next=. HashRedirect maps #scan/#terminal to real routes.
- Footer rewritten to system voice + Detroit signature; mounted globally in
  layout (removed per-page dup).
- 404 converted to the north star (scanlines, crt-sweep, glitch wordmark, amber).
- Stub pages for terminal/compare/invite/help/about/notifications via RouteStub.

Honest reconciliations: auth gate is client-side (no auth-helpers pkg; session is
client-side Supabase); GATED narrowed to protect the free-scan funnel; did not
stub over existing real pages; redirect param is ?next= (what /login reads).

26 new tests. Backend 1792 -> 1818, 142 suites, zero regressions. Web build clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/src/app/layout.tsx

@@ -4,6 +4,9 @@ import AuthProvider from '@/contexts/AuthContext';
 import ParlayProvider from '@/contexts/ParlayContext';
 import ExplainModeProvider from '@/contexts/ExplainModeContext';
 import Nav from '@/components/Nav';
+import Footer from '@/components/Footer';
+import AuthGate from '@/components/AuthGate';
+import HashRedirect from '@/components/vyndr/HashRedirect';
 import ParlayTray from '@/components/ParlayTray';
 import BottomTabBar from '@/components/BottomTabBar';
 import InstallPrompt from '@/components/InstallPrompt';
@@ -120,8 +123,13 @@ export default async function RootLayout({ children }: { children: React.ReactNo
           <AuthProvider>
             <ExplainModeProvider>
             <ParlayProvider>
+              <HashRedirect />
               <Nav />
-              <main style={{ paddingTop: 64, minHeight: '100vh', paddingBottom: 80 }}>{children}</main>
+              {/* Header = 60px nav + 32px ticker; offset main so content clears it. */}
+              <AuthGate>
+                <main style={{ paddingTop: 96, minHeight: '100vh', paddingBottom: 80 }}>{children}</main>
+              </AuthGate>
+              <Footer />
               <ParlayTray />
               <BottomTabBar />
               <InstallPrompt />