Mod Select: Support numeric row hotkeys to quick select Presets

[iwa]

always thought the Mod select screen missed something by not having hotkeys to select presets, so I've tried to implement it

I've renamed the HandleHotkeyPressed method into HandleModHotkeyPressed so it could be differentiated with the one I created for presets

I initially overload the HandleHotkeyPressed method with the arguments to handle Presets, but I thought it wasn't clean enough
can still revert to overloading if that's what y'all prefer

logic is inspired by and implemented in the sequential hotkey logic, but currently also works with classic hotkey logic (cause why not?)

Example

Screen.Recording.2026-01-19.at.17.23.32.mov

[iwa]

refactored so everything is held into OnKeyDown

kept the renaming of HandleHotkeyPressed into HandleModHotkeyPressed so name's a bit more precise, want me to revert that?

[peppy]

This needs test coverage.

[MegaGamer22]

I have to click to prevent the numbers from using the search bar instead of selecting the presets, am I missing something?
Edit: Remember to disable Automatically focus search text box in mod select.

[peppy]

that's correct. there's a setting to make the search box not focused by default, or you can press tab

[Loreos7]

Resolves #19683.