feat(desktop): add Electron desktop shell over the web profile

Spawn the real dsh CLI running the web profile on loopback (OS-assigned
port), parse the printed readiness URL, and open a native window at it.
The harness and its native addons stay on the system Node ABI; the main
imports only electron and node builtins.

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

apps/desktop/tsconfig.json

@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "lib/types",
+    "types": ["node"]
+  },
+  "include": ["src"]
+}