Add kiosk desktop app

Tauri app for the Pi. Media runs through the native LiveKit SDK because
WebKitGTK has no WebRTC, with frames encoded in Rust and drawn to a canvas
under the annotation overlay.

apps/kiosk-client/src/lib/components/TitleBar.svelte

@@ -0,0 +1,50 @@
+<script lang="ts">
+  import Icon from "@iconify/svelte";
+  import { Logo } from "@pistation/ui";
+  import { getCurrentWindow } from "@tauri-apps/api/window";
+
+  let { status }: { status: string } = $props();
+
+  const appWindow = getCurrentWindow();
+
+  async function toggleMaximize() {
+    if (await appWindow.isMaximized()) {
+      await appWindow.unmaximize();
+    } else {
+      await appWindow.maximize();
+    }
+  }
+</script>
+
+<header
+  data-tauri-drag-region
+  class="flex h-9 shrink-0 items-center gap-3 bg-surface-1 pr-px pl-3 select-none"
+>
+  <Logo size={18} />
+  <span data-tauri-drag-region class="text-xs font-medium text-ink-1">PiStation kiosk</span>
+  <span class="text-xs text-ink-2">{status}</span>
+
+  <div class="ml-auto flex h-full">
+    <button
+      onclick={() => appWindow.minimize()}
+      aria-label="Minimise"
+      class="flex h-full w-11 items-center justify-center text-ink-1 transition-colors hover:bg-surface-2"
+    >
+      <Icon icon="ph:minus-bold" width="14" />
+    </button>
+    <button
+      onclick={toggleMaximize}
+      aria-label="Maximise"
+      class="flex h-full w-11 items-center justify-center text-ink-1 transition-colors hover:bg-surface-2"
+    >
+      <Icon icon="ph:square-bold" width="12" />
+    </button>
+    <button
+      onclick={() => appWindow.close()}
+      aria-label="Close"
+      class="flex h-full w-11 items-center justify-center text-ink-1 transition-colors hover:bg-danger hover:text-white"
+    >
+      <Icon icon="ph:x-bold" width="14" />
+    </button>
+  </div>
+</header>