Hotkey to reload shader; updated global hotkeys menu

[matijaerceg]

Global Hotkeys menu:

Bottom of Shaders menu:

Summary

This stacked PR adds a global hotkey for reloading the current shader and surfaces it consistently in the Shader menu + Global Hotkeys UX. This smooths workflow when developing custom shaders.

Base branch: pr/hotkeys-clean
(Designed to be reviewed/merged on top of the previous hotkeys PR.)

What’s included

• Added new action: Reload Current Shader
  • Shader menu item: Reload Current Shader (immediate action, no ellipsis)
• Added new configurable global hotkey entry:
  • Global Hotkeys menu item: Reload Current Shader...
  • Default hotkey: Ctrl+Shift+R
• Added hotkeys menu clarity improvement:
  • Inactive heading Set Hotkeys: below the Enable toggle

Behavior

• Triggering Reload Current Shader:
  • If current shader is imported: re-import/recompile from its original path
  • Otherwise: refresh/reload current preset (UpdateShaderPreset)
• Global hotkey route is wired through existing hotkey infrastructure and WM_HOTKEY handling.