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-refresh

@@ -2,7 +2,7 @@
 
 # omarchy:summary=Refresh the current theme from its templates.
 
-THEME_NAME_PATH="$HOME/.config/omarchy/current/theme.name"
+THEME_NAME_PATH="$HOME/.local/state/omarchy/current/theme.name"
 
 if [[ -f $THEME_NAME_PATH ]]; then
   OMARCHY_THEME_SKIP_BACKGROUND=1 omarchy-theme-set "$(cat $THEME_NAME_PATH)"