feat: add walker and general launcher config

modules/capabilities/niri/default.nix

@@ -164,6 +164,7 @@ in
 
         binds = import ./_bindings.nix {
           browserCommand = config.meta.desktop.browser.command;
+          launcherCommands = config.meta.desktop.launcher.commands;
           terminalCommand = config.meta.desktop.terminal.command;
           shortcutCommands = shortcuts.commands;
         };