refactor default apps and add walker

modules/profiles/workstation-base.nix

@@ -24,6 +24,7 @@ in
       nixosModules.theme
       nixosModules.ai
       nixosModules.hidraw-access
+      nixosModules.walker-cache
     ];
 
     services.dbus.implementation = "broker";
@@ -42,9 +43,14 @@ in
       homeModules.passwords
       homeModules.clipboard
       homeModules.dev-tools
+      homeModules.xdg
+      homeModules.workstation-apps
       homeModules.primary-browser-vivaldi
       homeModules.primary-file-manager-nautilus
-      homeModules.desktop-defaults
+      homeModules.primary-launcher-walker
+      homeModules.default-image-viewer-imv
+      homeModules.default-document-viewer-sioyek
+      homeModules.default-editor-neovim
       homeModules.email
       homeModules.mpv
       homeModules.niri
@@ -58,7 +64,6 @@ in
       homeModules.primary-terminal-kitty
       homeModules.terminal-foot
       homeModules.theme
-      homeModules.walker
       homeModules.noctalia
       {
         programs.discord = {