Chore: Basic Layout/Chrome + Stubs (WIP)

src/routes/+layout.svelte

@@ -1,7 +1,92 @@
 <script lang="ts">
+  import { appState } from '$lib/state/app.svelte'
+  import { notificationsState } from '$lib/state/notifications.svelte'
+  import SplashScreen from '$lib/ui/chrome/SplashScreen.svelte'
+  import AuthGate     from '$lib/ui/chrome/AuthGate.svelte'
+  import Sidebar      from '$lib/ui/chrome/Sidebar.svelte'
+  import TitleBar     from '$lib/ui/chrome/TitleBar.svelte'
+  import Toaster      from '$lib/ui/chrome/Toaster.svelte'
   import '../app.css'
 
   let { children } = $props()
+
+  const isTauri    = typeof window !== 'undefined' && '__TAURI_INTERNALS__' in window
+  const ringFull   = $derived(appState.status !== 'booting')
+  const splashDone = $derived(
+    appState.status === 'ready' ||
+    appState.status === 'auth'  ||
+    appState.status === 'error'
+  )
+
+  let bypassed = $state(false)
+  const showApp = $derived(splashDone && (appState.status === 'ready' || appState.status === 'auth' || bypassed))
 </script>
 
-{@render children()}
+{#if !showApp}
+  <SplashScreen
+    mode="loading"
+    {ringFull}
+    failed={appState.status === 'error'}
+    onReady={() => {}}
+    onBypass={() => (bypassed = true)}
+    onRetry={() => window.location.reload()}
+  />
+{/if}
+
+{#if showApp}
+  <div class="frame">
+    <div class="shell">
+      {#if isTauri}
+        <TitleBar onClose={() => import('@tauri-apps/api/window').then(m => m.getCurrentWindow().close())} />
+      {/if}
+      <div class="body">
+        <Sidebar />
+        <main class="main">
+          {@render children()}
+        </main>
+      </div>
+    </div>
+  </div>
+{/if}
+
+<AuthGate />
+<Toaster toasts={notificationsState.toasts} />
+
+<style>
+  .frame {
+    display: flex;
+    padding: 6px 15px 15px;
+    width: 100%;
+    height: 100%;
+    box-sizing: border-box;
+    overflow: hidden;
+  }
+
+  .shell {
+    display: flex;
+    flex-direction: column;
+    flex: 1;
+    border-radius: var(--radius-2xl);
+    overflow: hidden;
+    border: 1px solid var(--border-dim);
+    background: var(--bg-base);
+    min-height: 0;
+    min-width: 0;
+  }
+
+  .body {
+    display: flex;
+    flex: 1;
+    min-height: 0;
+    min-width: 0;
+  }
+
+  .main {
+    flex: 1;
+    overflow: hidden;
+    background: var(--bg-surface);
+    transform: translateZ(0);
+    contain: layout style;
+    min-width: 0;
+  }
+</style>