feat(developer): keep font/size consistent, maybe +/- controls

### Is your feature request related to a problem? Please describe.

Can't see and had the editor on a big screen. Changed the 'Character Font' but the 'Code Font' was not changed at the same time, giving an odd effect.

### Describe the solution you'd like

- a hotkey to increase/dcrease the font wsize would be the nicest actually - control+ and control-
- perhaps keep the font _size_ in sync between the code font and character font?

### Describe alternatives you've considered

- doing nothing
- not filing this report

### Related issues

#10456

### Keyman apps

- [ ] Keyman for Android
- [ ] Keyman for iPhone and iPad
- [ ] Keyman for Linux
- [ ] Keyman for macOS
- [ ] Keyman for Windows
- [X] Keyman Developer
- [ ] KeymanWeb
- [ ] Other - give details at bottom of form

### Keyman version

17.0.267-alpha

### Operating system

windows 11

### Device

_No response_

### Target application

_No response_

### Browser

_No response_

### Keyboard name

_No response_

### Keyboard version

_No response_

### Language name

_No response_

### Additional context

_No response_