Background selector

[dhms013]

Details :

1. Added default/elephant/omarchy_background_selector.lua as elephant's provider
2. Edit Style > background in bin/omarchy-menu => access the elephant menus:omarchyBackgroundSelector
3. Edit bin/omarchy-menu => add background selector as default query (write 'background' in omarchy-menu's main page, then Enter)
4. Add migration file 1770380577.sh
5. Edit bin/omarchy-theme-set => add omarchy-restart-walker
6. Edit install/config/walker-elephant.sh => add new symlink

The goal :

• Add option for user to select the background using default shortcut that exec omarchy-theme-bg-next, or using 'UI' selector from omarchy-menu > style > background

background-selector.mp4

[CGCM070]

What about Super Ctrl Space

[dhms013]

What about Super Ctrl Space

I leave that as is. still execute the omarchy-theme-bg-next
so in this PR, when you select background trough UI menu (omarchy-menu > style > background), it'll open the background selector feature, where you can choose the background on the list. while using shortcut (Super+Ctrl+Space) still change background with next background.

in case you prefer to use this background selector using shortcut, you can do this

unbind = SUPER CTRL, SPACE
bindd = SUPER CTRL, SPACE , Background, exec, walker -m menus:omarchyBackgroundSelector