Add a keyboard-driven project setup flow (#2097)

* feat(projects): add keyboard-driven project setup

* test(app): update add project loading assertion

* fix(projects): harden GitHub project setup

packages/app/src/desktop/pick-directory.ts

@@ -11,6 +11,7 @@ export async function pickDirectory(
   const selection = await open({
     directory: true,
     multiple: false,
+    createDirectory: true,
   });
   if (selection === null) {
     return null;