chore: migrate omarchy state from ~/.config to ~/.local/state

Move all omarchy runtime state (themes, backgrounds, current theme)
from ~/.config/omarchy/current to ~/.local/state/omarchy/current
to keep the config dir free of generated files. Add mise task for
recreating symlinks and update credential helpers for tea.

script/omarchy-theme-set-gnome

@@ -3,7 +3,7 @@
 # omarchy:summary=Apply the current theme to GNOME color mode and icon settings
 # omarchy:hidden=true
 
-if [[ -f ~/.config/omarchy/current/theme/light.mode ]]; then
+if [[ -f ~/.local/state/omarchy/current/theme/light.mode ]]; then
   gsettings set org.gnome.desktop.interface color-scheme "prefer-light"
   gsettings set org.gnome.desktop.interface gtk-theme "Adwaita"
 else
@@ -12,7 +12,7 @@ else
 fi
 
 # Change gnome icon theme color
-GNOME_ICONS_THEME=~/.config/omarchy/current/theme/icons.theme
+GNOME_ICONS_THEME=~/.local/state/omarchy/current/theme/icons.theme
 if [[ -f $GNOME_ICONS_THEME ]]; then
   gsettings set org.gnome.desktop.interface icon-theme "$(<$GNOME_ICONS_THEME)"
 else