Add files via upload (#4522)

Center and resize the foreground window using global hotkeys. Cycle hotkey steps through custom sizes in order. Combine with center hotkey to resize+center in one press. Optionally auto-restores maximized windows before resizing.

## Mod authorship

- - [ ] The submitter, without AI assistance
- - [x] The submitter, with AI assistance
- - [x] Claude
- - [ ] ChatGPT
- - [ ] Gemini
- - [ ] Another AI (please specify): 
- - [ ] Other (please specify):

Author: Salyts