refactor default apps and add walker

modules/capabilities/niri/_bindings.nix

@@ -1,6 +1,6 @@
 {
   browserCommand,
-  launcherCommands,
+  launcherCommand,
   shortcutCommands,
   terminalCommand,
 }:
@@ -16,7 +16,7 @@
   };
   "Mod+Space" = {
     repeat = false;
-    action.spawn = launcherCommands.open;
+    action.spawn = launcherCommand;
     hotkey-overlay.title = "App Launcher";
   };
   "Mod+E" = {
@@ -39,16 +39,6 @@
     action.spawn = shortcutCommands.editSecrets;
     hotkey-overlay.title = "Edit Secrets";
   };
-  "Mod+Ctrl+F" = {
-    repeat = false;
-    action.spawn = launcherCommands.files;
-    hotkey-overlay.title = "Find Files";
-  };
-  "Mod+V" = {
-    repeat = false;
-    action.spawn = shortcutCommands.clipboardHistory;
-    hotkey-overlay.title = "Clipboard History";
-  };
   "Mod+Ctrl+C" = {
     repeat = false;
     action.spawn = shortcutCommands.pickColor;