Feature/hot reload dev mode

[zakuru]

Would be great to have a dev flow with hot reload
What do you think?
Here is quick demo of how it would zakuru#1
One changes it reloads the app and also preserves the converstation state

The says the npm run start give hot reload but it's not correct

gemini-cli/docs/get-started/deployment.md

Line 66 in 5f6453a

- **Development Mode:** This method provides hot-reloading and is useful for