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/.local/bin/binds-help.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+# Searchable cheat sheet of Hyprland keybindings, shown in wofi.
+#
+# The descriptions shown here come from the `desc` option passed to hl.bind()
+# in ~/.config/hypr/binds.lua, read back at runtime via `hyprctl binds -j`,
+# so the cheat sheet always matches the live config.
+set -u
+
+mods_from_mask() {
+    local mask="$1" out=""
+    (( mask & 1 ))   && out="${out:+$out + }SHIFT"
+    (( mask & 4 ))   && out="${out:+$out + }CTRL"
+    (( mask & 8 ))   && out="${out:+$out + }ALT"
+    (( mask & 64 ))  && out="${out:+$out + }SUPER"
+    (( mask & 128 )) && out="${out:+$out + }MOD5"
+    printf "%s" "$out"
+}
+
+hyprctl binds -j |
+    jq -rc '.[] | select(.has_description) | select(.description != "") | [.modmask, .key, .description] | @tsv' |
+    while IFS=$'\t' read -r mask key desc; do
+        if (( mask )); then
+            mods="$(mods_from_mask "$mask")"
+            printf '%s + %s\t%s\n' "$mods" "$key" "$desc"
+        else
+            printf '%s\t%s\n' "$key" "$desc"
+        fi
+    done |
+    sort -k1,1 |
+    column -t -s $'\t' |
+    wofi --dmenu --prompt "Hyprland keybinds" >/dev/null