yabai: add a window transparency change duration

previously yabai wouldn't be able to start up jankyborders or sketchybar
as a service as the appropriate paths weren't in $PATH.

stow/.config/yabai/yabairc

@@ -5,9 +5,9 @@ yabai -m signal --add event=dock_did_restart action="sudo yabai --load-sa"
 sudo yabai --load-sa
 
 # Sketchybar Intergration
-if command -v "sketchybar"; then
+if [ -f "/opt/homebrew/bin/sketchybar" ]; then
   yabai -m config menubar_opacity 0.0
-  sketchybar & disown
+  /opt/homebrew/bin/sketchybar & disown
   yabai -m signal --remove "sketchybar_space_change" 2>/dev/null
   yabai -m signal --remove "sketchybar_front_app" 2>/dev/null
 
@@ -17,6 +17,7 @@ if command -v "sketchybar"; then
 fi
 
 # autostart
+eval "$(/opt/homebrew/bin/brew shellenv)"
 borders active_color=0xfff74f9e inactive_color=0xffffa8f1 width=6.0 & disown
 sh ~/.cache/matugen-jankyborders.sh & disown
 skhd & disown
@@ -53,6 +54,7 @@ yabai -m config window_shadow float # window shadow only on floating windows
 yabai -m config window_opacity on
 yabai -m config active_window_opacity 1.0
 yabai -m config normal_window_opacity 0.95
+yabai -m config window_opacity_duration 0.2
 
 # window rules
 yabai -m rule --add app="^(Calculator|System Preferences|System Settings|Archive Utility)$" manage=off