feat(mibook): add swapfile and nodejs dev tooling

Add an 8G swapfile for headroom during nix builds (7.7G RAM, no prior
swap) and bring nodejs (bundles npm) into the development profile.
Also picks up latest flake.lock input updates.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01C5fRUDLRzDhoKhEqa69cyR

machines/mibook/configuration.nix

@@ -16,6 +16,13 @@
   ];
 
   networking.hostName = "mibook";
+
+  swapDevices = [
+    {
+      device = "/var/lib/swapfile";
+      size = 8 * 1024; # 8G, headroom for nix builds (7.7G RAM, no prior swap)
+    }
+  ];
   boot.loader.grub = {
     enable = true;
     device = "/dev/nvme0n1";