feat(nodejs): add fnm node version manager

home/hosts/work/default.nix

@@ -81,7 +81,10 @@
   taskwarrior.enable = true;
   terminal.enable = true;
   infra.enable = true;
-  nodejs.enable = true;
+  nodejs = {
+    enable = true;
+    fnm.enable = true;
+  };
   secrets.enable = true;
   secrets.vault.enable = true;
   ticketing.enable = true;

home/modules/nodejs/default.nix

@@ -13,16 +13,24 @@ in
   options.nodejs = {
     enable = lib.mkEnableOption "Node.js";
     package = lib.mkPackageOption pkgs "nodejs_24" { };
+    fnm.enable = lib.mkEnableOption "fnm";
   };
 
   config = lib.mkIf cfg.enable {
-    home.packages = with pkgs; [
+    home.packages =
+      with pkgs;
+      [
         cfg.package
         pnpm
         yarn
         biome
         tsx
-    ];
+      ]
+      ++ lib.optional cfg.fnm.enable fnm;
+
+    programs.bash.initExtra = lib.mkIf cfg.fnm.enable ''
+      eval "$(fnm env --use-on-cd --shell bash)"
+    '';
 
     programs.npm = {
       inherit (cfg) enable package;