feat(web): set up React app shell with routing and layout

Adds react-router-dom with routes for ship list, dashboard, and rules pages.
Includes TopBar with navigation and mobile-first dark theme CSS.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/App.tsx

@@ -1,9 +1,19 @@
+import { BrowserRouter, Routes, Route } from 'react-router-dom';
+import ShipListPage from './pages/ShipListPage';
+import ShipDashboardPage from './pages/ShipDashboardPage';
+import RulesPage from './pages/RulesPage';
+
 function App() {
   return (
+    <BrowserRouter>
       <div className="app">
-      <h1>Spelljammer Ship Tracker</h1>
-      <p>App is running. Routes coming soon.</p>
+        <Routes>
+          <Route path="/" element={<ShipListPage />} />
+          <Route path="/ship/:id" element={<ShipDashboardPage />} />
+          <Route path="/rules" element={<RulesPage />} />
+        </Routes>
       </div>
+    </BrowserRouter>
   );
 }
 

web/src/components/layout/PageContainer.tsx

@@ -0,0 +1,5 @@
+import type { ReactNode } from 'react';
+
+export default function PageContainer({ children }: { children: ReactNode }) {
+  return <main className="page-container">{children}</main>;
+}

web/src/components/layout/TopBar.tsx

@@ -0,0 +1,32 @@
+import { useNavigate, useLocation } from 'react-router-dom';
+
+export default function TopBar({ title }: { title?: string }) {
+  const navigate = useNavigate();
+  const location = useLocation();
+  const isHome = location.pathname === '/';
+
+  return (
+    <header className="top-bar">
+      <div className="top-bar-left">
+        {!isHome && (
+          <button className="top-bar-back" onClick={() => navigate(-1)}>
+            &larr;
+          </button>
+        )}
+        <h1 className="top-bar-title">{title || 'Spelljammer'}</h1>
+      </div>
+      <nav className="top-bar-right">
+        {location.pathname !== '/rules' && (
+          <button className="top-bar-link" onClick={() => navigate('/rules')}>
+            Rules
+          </button>
+        )}
+        {!isHome && location.pathname !== '/rules' && (
+          <button className="top-bar-link" onClick={() => navigate('/')}>
+            Ships
+          </button>
+        )}
+      </nav>
+    </header>
+  );
+}

web/src/index.css

@@ -88,3 +88,92 @@ a {
 a:hover {
   text-decoration: underline;
 }
+
+/* Top Bar */
+.top-bar {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: var(--spacing-sm) 0;
+  margin-bottom: var(--spacing-md);
+  border-bottom: 1px solid var(--color-border);
+}
+
+.top-bar-left {
+  display: flex;
+  align-items: center;
+  gap: var(--spacing-sm);
+}
+
+.top-bar-title {
+  font-size: 1.2rem;
+  font-weight: 600;
+}
+
+.top-bar-back {
+  background: none;
+  color: var(--color-primary);
+  font-size: 1.2rem;
+  padding: var(--spacing-xs) var(--spacing-sm);
+}
+
+.top-bar-right {
+  display: flex;
+  gap: var(--spacing-sm);
+}
+
+.top-bar-link {
+  background: var(--color-accent);
+  color: var(--color-text);
+  font-size: 0.85rem;
+  padding: var(--spacing-xs) var(--spacing-sm);
+}
+
+.top-bar-link:hover {
+  background: var(--color-surface-hover);
+}
+
+/* Page Container */
+.page-container {
+  padding-bottom: var(--spacing-xl);
+}
+
+/* Buttons */
+.btn-primary {
+  background: var(--color-primary);
+  color: #fff;
+}
+
+.btn-primary:hover {
+  background: var(--color-primary-hover);
+}
+
+.btn-danger {
+  background: var(--color-danger);
+  color: #fff;
+}
+
+.btn-danger:hover {
+  background: #d32f2f;
+}
+
+.btn-secondary {
+  background: var(--color-accent);
+  color: var(--color-text);
+}
+
+.btn-secondary:hover {
+  background: var(--color-surface-hover);
+}
+
+.btn-icon {
+  background: none;
+  padding: var(--spacing-xs);
+  font-size: 1.2rem;
+  line-height: 1;
+  color: var(--color-text-muted);
+}
+
+.btn-icon:hover {
+  color: var(--color-text);
+}

web/src/pages/RulesPage.tsx

@@ -0,0 +1,13 @@
+import TopBar from '../components/layout/TopBar';
+import PageContainer from '../components/layout/PageContainer';
+
+export default function RulesPage() {
+  return (
+    <>
+      <TopBar title="Battle Reference" />
+      <PageContainer>
+        <p style={{ color: 'var(--color-text-muted)' }}>Rules reference coming soon...</p>
+      </PageContainer>
+    </>
+  );
+}

web/src/pages/ShipDashboardPage.tsx

@@ -0,0 +1,16 @@
+import { useParams } from 'react-router-dom';
+import TopBar from '../components/layout/TopBar';
+import PageContainer from '../components/layout/PageContainer';
+
+export default function ShipDashboardPage() {
+  const { id } = useParams<{ id: string }>();
+
+  return (
+    <>
+      <TopBar title="Ship Dashboard" />
+      <PageContainer>
+        <p style={{ color: 'var(--color-text-muted)' }}>Dashboard for ship {id} coming soon...</p>
+      </PageContainer>
+    </>
+  );
+}

web/src/pages/ShipListPage.tsx

@@ -0,0 +1,13 @@
+import TopBar from '../components/layout/TopBar';
+import PageContainer from '../components/layout/PageContainer';
+
+export default function ShipListPage() {
+  return (
+    <>
+      <TopBar title="Ships" />
+      <PageContainer>
+        <p style={{ color: 'var(--color-text-muted)' }}>Ship list coming soon...</p>
+      </PageContainer>
+    </>
+  );
+}