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-browser

@@ -3,7 +3,7 @@
 # omarchy:summary=Apply the current theme color to Chromium, Chrome, Edge, and Brave
 # omarchy:hidden=true
 
-CHROMIUM_THEME=~/.config/omarchy/current/theme/chromium.theme
+CHROMIUM_THEME=~/.local/state/omarchy/current/theme/chromium.theme
 
 if [[ -f $CHROMIUM_THEME ]]; then
   THEME_RGB_COLOR=$(<$CHROMIUM_THEME)