Fix jumping cursor bug

[gregplaysguitar]

In production react, when mvc state provides the value to a controlled input, the cursor jumps to the end on every keystroke. This only happens in production, not development, due to React's batching behaviour. Repro with yarn demo:production

cursor_jump.mov

This PR

1. Adds a playwright test suite to reproduce the problem
2. Inlines https://github.com/aha-app/react-easy-state which is not used anywhere else
3. Fixes the problem by saving and restoring the cursor position in the view code

The actual fix is in eb145bc