Update nix-darwin codex flake and switch config

nix-darwin/home/kat.nix

@@ -0,0 +1,36 @@
+{pkgs, ...}: {
+  home.packages = with pkgs; [
+    alejandra
+    claude-code
+    cocoapods
+    codex
+    nodejs
+    prettier
+    slack
+    tea
+    typescript
+    vim
+    yarn
+  ];
+
+  services.git-sync = {
+    enable = true;
+    package =
+      if pkgs ? "git-sync-rs"
+      then pkgs."git-sync-rs"
+      else pkgs.git-sync;
+    repositories = {
+      org = {
+        path = "/Users/kat/org";
+        uri = "ssh://gitea@1896Folsom.duckdns.org:1123/kkathuang/org.git";
+        interval = 180;
+      };
+      password-store = {
+        path = "/Users/kat/.password-store";
+        uri = "git@github.com:IvanMalison/.password-store.git";
+      };
+    };
+  };
+
+  home.stateVersion = "24.05";
+}