Fix some build warnings

src/app/call.ts

@@ -4,15 +4,15 @@
  */
 import {
   DisconnectReason,
-  LocalParticipant,
-  LocalTrackPublication,
-  Participant,
   Room as LiveKitRoom,
   RoomEvent,
   Track,
-  TrackPublication,
   supportsAudioOutputSelection,
   type AudioCaptureOptions,
+  type LocalParticipant,
+  type LocalTrackPublication,
+  type Participant,
+  type TrackPublication,
 } from "livekit-client"
 import {App} from "@capacitor/app"
 import {derived, get, writable} from "svelte/store"

src/app/components/QRCode.svelte

@@ -1,5 +1,4 @@
 <script lang="ts">
-  import QRCode from "qrcode"
   import Button from "@lib/components/Button.svelte"
   import {clip} from "@app/toast"
 
@@ -12,22 +11,20 @@
 
   const copy = () => clip(code)
 
-  $effect(() => {
-    if (canvas && wrapper && code) {
-      QRCode.toCanvas(canvas, code)
-    }
-  })
+  // qrcode is imported here rather than at the top of the module because svelte strips effect
+  // bodies when compiling for SSR, which would leave the import with no remaining use.
+  const draw = async (canvas: HTMLCanvasElement, wrapper: Element, code: string) => {
+    const QRCode = await import("qrcode")
+
+    await QRCode.toCanvas(canvas, code)
+
+    scale = wrapper.getBoundingClientRect().width / canvas.width
+    height = canvas.height * scale
+  }
 
   $effect(() => {
-    // Draw first so canvas.width/height reflect the current code, then fit the
-    // intrinsic canvas size to the wrapper. Measure the intrinsic size (not
-    // getBoundingClientRect, which includes the transform below) so this stays
-    // idempotent — otherwise scale feeds back into its own measurement and loops.
     if (canvas && wrapper && code) {
-      const wrapperRect = wrapper.getBoundingClientRect()
-
-      scale = wrapperRect.width / canvas.width
-      height = canvas.height * scale
+      draw(canvas, wrapper, code)
     }
   })
 </script>

vite.config.ts

@@ -47,8 +47,20 @@ export default defineConfig({
     SvelteKitPWA({
       registerType: "autoUpdate",
       injectRegister: "auto",
+      // adapter-static writes the fallback shell after the service worker is generated, so the
+      // plugin can't glob it — this precaches "/" explicitly, giving workbox's navigation
+      // fallback something to bind to.
+      kit: {
+        spa: true,
+        adapterFallback: "/",
+      },
       workbox: {
         maximumFileSizeToCacheInBytes: 5 * 1024 ** 2, // 5 MB or set to something else
+        // The service worker is generated before SvelteKit prerenders anything, so the
+        // "prerendered/**" glob @vite-pwa/sveltekit forces in never matches. It only forces it
+        // when modifyURLPrefix is unset, and an empty one is a no-op.
+        modifyURLPrefix: {},
+        globPatterns: ["client/**/*.{js,css,ico,png,svg,webp,webmanifest}"],
       },
       manifest: {
         name: process.env.VITE_PLATFORM_NAME,