- Enable Alt+Numpad input
- For this to be effective, the default keybindings for Alt+{Number}
will need to be unbound. This won't be needed once we gain the ability
to differentiate numpad digit keys from alphanumeric digit keys.
  - Fixes https://github.com/zed-industries/zed/issues/40699
- Fix a number of edge cases with dead keys

Release Notes:

- N/A