network: listen to NM Wired interface + use nmcli for route metrics

- Some other misc floating window change, too lazy to separate the
  commit

core/internal/config/embedded/niri-binds.kdl

@@ -1,8 +1,3 @@
-// ! DO NOT EDIT !
-// ! AUTO-GENERATED BY DMS !
-// ! CHANGES WILL BE OVERWRITTEN !
-// ! PLACE YOUR CUSTOM CONFIGURATION ELSEWHERE !
-
 binds {
     // === System & Overview ===
     Mod+D repeat=false { toggle-overview; }