Update theme engine

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/configs/user/gui/theme/theme.completion.zsh

@@ -2,6 +2,9 @@ _theme_completion() {
   local options=(
     '-m[Set mode: 'light', 'dark', or 'toggle']:mode:(light dark toggle)'
     '-w[Set wallpaper file]:file:_files'
+    '-h[Set plain color (hex)]:hex color:'
+    '-f[Set flavor]:flavor:(content expressive fidelity fruit-salad monochrome neutral rainbow tonal-spot)'
+    '-c[Set contrast (-1 to 1)]:contrast:'
   )
   local curcontext="$curcontext" state line
   typeset -A opt_args