refactor default apps and add walker

modules/capabilities/walker.nix

@@ -1,40 +1,40 @@
-{ inputs, ... }:
+{ config, inputs, ... }:
+let
+  homeModules = config.flake.modules.homeManager;
+in
 {
+  flake.modules.nixos.walker-cache = {
+    nix.settings = {
+      extra-substituters = [
+        "https://walker.cachix.org"
+        "https://walker-git.cachix.org"
+      ];
+      extra-trusted-public-keys = [
+        "walker.cachix.org-1:fG8q+uAaMqhsMxWjwvk0IMb4mFPFLqHjuvfwQxE4oJM="
+        "walker-git.cachix.org-1:vmC0ocfPWh0S/vRAQGtChuiZBTAe4wiKDeyyXM0/7pM="
+      ];
+    };
+  };
+
   flake.modules.homeManager.walker =
     {
       config,
-      lib,
       ...
     }:
-    let
-      launcherCommand = lib.getExe config.programs.walker.package;
-    in
     {
       imports = [ inputs.walker.homeManagerModules.default ];
 
       programs.walker = {
-        enable = true;
-        runAsService = true;
-      };
-
-      meta.desktop.launcher = {
-        package = config.programs.walker.package;
-        commands = {
-          open = [ launcherCommand ];
-          files = [
-            launcherCommand
-            "--query"
-            "/"
-            "--placeholder"
-            "Find files"
-          ];
-          dmenu = [
-            launcherCommand
-            "--dmenu"
-            "--placeholder"
-            "Search clipboard"
-          ];
-        };
+        enable = false;
+        runAsService = false;
       };
     };
+
+  flake.modules.homeManager.primary-launcher-walker =
+    { config, lib, ... }:
+    {
+      imports = [ homeModules.walker ];
+
+      meta.desktop.launcherCommand = lib.getExe config.programs.walker.package;
+    };
 }