First crack at the app. Still lots of bugs to squash.

src/App.svelte

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+<script lang="ts">
+    import {router} from 'svelte-spa-router'
+    import {auth} from './lib/stores/auth.svelte'
+    import TopBar from './lib/components/TopBar.svelte'
+    import BottomNav from './lib/components/BottomNav.svelte'
+
+    import Login from './routes/Login.svelte'
+    import Signup from './routes/Signup.svelte'
+    import HuntList from './routes/hunter/HuntList.svelte'
+    import HuntLobby from './routes/hunter/HuntLobby.svelte'
+    import HuntPlay from './routes/hunter/HuntPlay.svelte'
+    import Leaderboard from './routes/hunter/Leaderboard.svelte'
+    import AdminHome from './routes/admin/AdminHome.svelte'
+    import HuntCreate from './routes/admin/HuntCreate.svelte'
+    import HuntManage from './routes/admin/HuntManage.svelte'
+    import PhotoReview from './routes/admin/PhotoReview.svelte'
+
+    const routes = {
+    '/':                               HuntList,
+    '/login':                          Login,
+    '/signup':                         Signup,
+    '/hunt/:huntId':                   HuntLobby,
+    '/hunt/:huntId/play':              HuntPlay,
+    '/hunt/:huntId/leaderboard':       Leaderboard,
+    '/admin':                          AdminHome,
+    '/admin/hunt/create':              HuntCreate,
+    '/admin/hunt/:huntId':             HuntManage,
+    '/admin/hunt/:huntId/review':      PhotoReview,
+  }
+
+  const publicRoutes = ['/login', '/signup']
+  const isPublicRoute = $derived(publicRoutes.includes(router.location))
+  const showShell = $derived(auth.isLoggedIn && !isPublicRoute)
+  const showBottomNav = $derived(showShell && !auth.isAdmin)
+</script>
+
+<div class="min-h-screen bg-base-200" class:pb-16={showBottomNav}>
+  {#if showShell}
+    <TopBar />
+  {/if}
+
+  <Router {routes} />
+
+  {#if showBottomNav}
+    <BottomNav />
+  {/if}
+</div>