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/netbird-breeze-icons.hook

@@ -0,0 +1,11 @@
+[Trigger]
+Operation = Install
+Operation = Upgrade
+Type = Package
+Target = netbird-ui
+Target = netbird-ui-bin
+
+[Action]
+Description = Patching NetBird tray icons to match Breeze...
+When = PostTransaction
+Exec = /usr/local/share/netbird-breeze-icons/apply.sh