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-foot

@@ -3,7 +3,7 @@
 # omarchy:summary=Apply current Omarchy theme colors to running Foot terminals
 # omarchy:hidden=true
 
-foot_theme=~/.config/omarchy/current/theme/foot.ini
+foot_theme=~/.local/state/omarchy/current/theme/foot.ini
 
 if [[ ! -f $foot_theme ]] || ! pgrep -x foot >/dev/null; then
   exit 0