Build Wisp: on-device transcription studio (web + native, one codebase)

Private, offline speech-to-text that runs Whisper on the user's own device —
free, no account, no per-minute fees. Replaces Otter.ai / Rev.

- Pure, tested engine: chunking, overlap timestamp-stitching, exports
  (SRT/VTT/TXT/MD/JSON), WAV codec, resampler, job queue, model catalog (142 tests).
- Platform-abstracted TranscriptionEngine: transformers.js on web (loaded from
  CDN at runtime to dodge Metro's onnxruntime-web bundling limits), whisper.rn
  on native. Shared pipeline orchestrates decode -> chunk -> transcribe -> stitch.
- Cross-platform StorageRepo (Dexie web / expo-sqlite native), Zod-validated.
- UI: library + search, import, live-progress transcription, synced click-to-seek
  editor, multi-format export; model picker + privacy in settings.
- Web ships as a single-page PWA with COOP/COEP isolation for threaded WASM;
  Docker (nginx) image + Traefik compose for wisp.briggen.dev.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/_layout.tsx

@@ -1,15 +1,17 @@
-import { DarkTheme, DefaultTheme, ThemeProvider } from 'expo-router';
+import { DarkTheme, DefaultTheme, Stack, ThemeProvider } from 'expo-router';
+import { StatusBar } from 'expo-status-bar';
 import { useColorScheme } from 'react-native';
 
-import { AnimatedSplashOverlay } from '@/components/animated-icon';
-import AppTabs from '@/components/app-tabs';
-
-export default function TabLayout() {
-  const colorScheme = useColorScheme();
+export default function RootLayout() {
+  const scheme = useColorScheme();
   return (
-    <ThemeProvider value={colorScheme === 'dark' ? DarkTheme : DefaultTheme}>
-      <AnimatedSplashOverlay />
-      <AppTabs />
+    <ThemeProvider value={scheme === 'dark' ? DarkTheme : DefaultTheme}>
+      <Stack>
+        <Stack.Screen name="index" options={{ title: 'Wisp' }} />
+        <Stack.Screen name="transcript/[id]" options={{ title: 'Transcript' }} />
+        <Stack.Screen name="settings" options={{ title: 'Settings' }} />
+      </Stack>
+      <StatusBar style="auto" />
     </ThemeProvider>
   );
 }