Add v2 rewrite: monorepo with desktop and web apps, shared packages, docs, and wireframes

apps/web/src/README.md

@@ -0,0 +1,8 @@
+# Web Source Layout
+
+- `main.tsx`: renderer bootstrap.
+- `ui/`: React UI components.
+- `rpcClient.ts`: browser-side client for the preload RPC bridge.
+- `styles.css`: renderer styles.
+
+Keep Electron-specific code out of this app. Shared message shapes belong in `packages/contracts`.