feat(tray-icons): shrink and recolor the NetBird tray icons

NetBird sends its tray icon as a pixmap, so an icon theme can't
replace it. patch.py rewrites the 48x48 PNGs embedded in netbird-ui in
place: the glyph is scaled to 80% to get Breeze's padding and the
white variants take the panel text color (#dedede). A pacman hook
re-patches the binary after every netbird-ui upgrade, and restore.sh
puts the original back.

kde/tray-icons/.local/share/netbird-breeze-icons/install.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+# Install the netbird-ui tray icon patch and its pacman hook. Usage: sudo ./install.sh
+set -euo pipefail
+here=$(cd "$(dirname "$0")" && pwd)
+ROOT=${ROOT:-}   # for dry-run testing only
+[[ $EUID -eq 0 || -n $ROOT ]] || { echo "Must be run with sudo"; exit 1; }
+dest=$ROOT/usr/local/share/netbird-breeze-icons
+
+install -Dm755 "$here/patch.py" "$dest/patch.py"
+install -m755 "$here/apply.sh" "$dest/apply.sh"
+install -Dm644 "$here/netbird-breeze-icons.hook" "$ROOT/etc/pacman.d/hooks/netbird-breeze-icons.hook"
+ROOT=$ROOT "$dest/apply.sh"
+
+echo "Done. Restart the NetBird UI (without sudo):"
+echo "  pkill -x netbird-ui; setsid -f netbird-ui --daemon-addr unix:///var/run/netbird/main.sock >/dev/null 2>&1"