feat(config): add scratch terminal binding and window rule, remove pj function

dot_config/hypr/bindings.lua

@@ -65,6 +65,13 @@ o.bind("SUPER + CTRL + K", "Previous workspace", hl.dsp.focus({ workspace = "e-1
 hl.unbind("SUPER + CTRL + S") -- was: share menu
 o.bind("SUPER + CTRL + S", "Toggle scratchpad", hl.dsp.workspace.toggle_special("scratchpad"))
 
+-- Mod+A is the scratch terminal: the same scratchpad toggle, except an empty
+-- scratchpad starts kitty with ~/.config/kitty/herdr.conf (class kitty-herdr,
+-- pinned to the scratchpad by the window rule in hypr/hyprland.lua) instead of
+-- sliding an empty workspace into view. SUPER + A is free in Omarchy.
+-- Needs ~/.local/bin/omarchy-toggle-scratch.
+o.bind("SUPER + A", "Toggle scratch terminal", "omarchy-toggle-scratch")
+
 -- Workspaces 1 to 5 on the home row of the left half: ALT to focus,
 -- ALT + SHIFT to send the window there. No Omarchy default uses ALT with a
 -- letter, so nothing is unbound.