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.

config/hypr/hyprlock.conf

@@ -1,4 +1,4 @@
-source = ~/.config/omarchy/current/theme/hyprlock.conf
+source = ~/.local/state/omarchy/current/theme/hyprlock.conf
 
 # GENERAL
 general {
@@ -8,7 +8,7 @@ general {
 
 background {
     monitor =
-      path = ~/.config/omarchy/current/background
+      path = ~/.local/state/omarchy/current/background
       color = $color
 }