Background selector (#4519)

* UPDATE: select background method

* ADD: migration file for background selector

* Add symlink for background selector in walker-elephant.sh

Forgot about this file. Should be added to make sure the background selector feature available in the fresh install

* clean up the code a bit

Updated omarchy background selector to hide from provider list and removed subtext from entries.

* Make the background selector the default

* Fix migration

* FIX: typo on background symlink target

* UPDATE: add ~/.config/omarchy/backgrounds/theme.name

* UPDATE: Cache = false

* Fix escaping for all extensions

* Extract omarchy-theme-bg-set

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Co-authored-by: David Heinemeier Hansson <david@hey.com>

install/config/walker-elephant.sh

@@ -27,3 +27,4 @@ EOF
 # Link the visual theme menu config
 mkdir -p ~/.config/elephant/menus
 ln -snf $OMARCHY_PATH/default/elephant/omarchy_themes.lua ~/.config/elephant/menus/omarchy_themes.lua
+ln -snf $OMARCHY_PATH/default/elephant/omarchy_background_selector.lua ~/.config/elephant/menus/omarchy_background_selector.lua