feat(waybar,sway): htop click handler, app keybinds, VPN toggle

waybar:
- cpu / custom/memory: on-click opens floating ghostty with htop
- new custom/vpn module between custom/memory and network#bond:
  shows 'VPN' coloured by interface UP flag (green up, dim down);
  on-click toggles networkctl up/down hodor; SIGRTMIN+8 used for
  instant refresh after toggle

sway:
- Super+Shift+Return -> ghostty -e yazi
- Super+Shift+b -> librewolf

vpn-toggle.sh runs networkctl (no sudo) thanks to a new polkit rule
allowing wheel-group members to invoke org.freedesktop.network1.*
without a password prompt. systemd-networkd's polkit gate is a
separate path from sudoers, so this is the idiomatic fix.

KEYBINDS.md updated for both new sway bindings.

1 files changed, 12 insertions, 0 deletions

diff --git a/dot_config/waybar/executable_vpn-status.sh b/dot_config/waybar/executable_vpn-status.sh
new file mode 100644
index 0000000..37fea84
--- /dev/null
+++ b/dot_config/waybar/executable_vpn-status.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+# Waybar custom/vpn module: report whether the wireguard interface
+# (managed by systemd-networkd) is admin-up. Output is a single line of
+# JSON so waybar can style it via the .up / .down classes.
+
+iface=hodor
+
+if ip link show "$iface" 2>/dev/null | grep -qE '<[^>]*\<UP\>'; then
+  printf '{"text":"VPN","class":"up","tooltip":"%s up"}\n' "$iface"
+else
+  printf '{"text":"VPN","class":"down","tooltip":"%s down"}\n' "$iface"
+fi