hyprland: add SUPER+arrow workspace cycling and overview binds

SUPER+Left/Right cycle existing workspaces on the active monitor
(m+1/m-1 with cycling enabled), SUPER+Up opens the hyprshell overview
scoped to the current monitor (create/manage workspaces there), and
SUPER+Down closes the overview again. Adds binds-help.sh cheat sheet
(SHIFT+SUPER+H) and overview-close.sh helper.

hyprland/.config/hypr/hyprland.lua

@@ -39,6 +39,14 @@ hl.config({
   },
 })
 
+hl.config({
+  binds = {
+    -- Let SUPER+Left/Right (and scroll) wrap around instead of stopping at the
+    -- edge when cycling workspaces on the active monitor.
+    allow_workspace_cycles = true,
+  },
+})
+
 hl.config({
   decoration = {
     rounding = 4,