feat(profiles): improve profile management

[anolithme]

Description

This improves the profile screen and fixes the profile lifecycle behind it.

• new profiles start from defaults
• profile actions are grouped in a settings menu with clone, rename, icon, favorite, export, and delete
• Minecraft controls can be shared or kept separate per profile
• Enter, Numpad Enter, and IME Done submit profile names
• config snapshots and HUD state stay isolated when profiles are created, switched, cloned, renamed, or deleted
• the profiles folder can be opened from the screen

The lifecycle changes also prevent renamed or deleted profiles from being recreated by delayed snapshot writes, keep HUD previews in sync while the UI is open, and make snapshot writes atomic.

Related Issue(s)

Closes #880
Closes #931

Testing

• profile lifecycle, snapshot storage, compat snapshot, HUD isolation, and controls transition tests
• Minecraft keybind transition tests and mixin audit on 1.21.4, 1.21.11, 26.1, and 26.2
• config, config-impl, HUD, and utils API checks
• internal UI compilation

No documentation changes are needed; this only changes the in-game profile UI and its lifecycle behavior.

Checklist

• I made a clear description of what was changed
• I stated why these changes were necessary
• I updated documentation or said what needs to be updated
• I made sure these changes are backwards compatible
• This pull request is for one feature/bug fix