Integrate Darwin branch features into integration branch

- Add AeroSpace window manager configuration and file setup
- Add LazyVim setup with gh-addressed plugin
- Add Darwin-specific secrets (work key + work-wg.age)
- Reorganize kitty config into separate profile
- Make Linux-only packages conditional (iputils, strace, vim-tidal)
- Fix nix-darwin compatibility (remove deprecated options, add primaryUser)
- Update font packages to new nerd-fonts structure
- Add platform-aware nrb alias (detects Darwin vs Linux)
- Use shared tmux config instead of Darwin-specific duplicate
- Update Darwin host config (disable yabai, enable AeroSpace)
- Fix sketchybar permissions and gitignore .direnv tracking

Integration branch now works on both Darwin and Linux with all Darwin improvements.

Amp-Thread-ID: https://ampcode.com/threads/T-9427454f-2ecb-40ef-998b-0f33f0950105
Co-authored-by: Amp <amp@ampcode.com>

secrets/secrets.nix

@@ -6,6 +6,7 @@ let
   lituus = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIH2lAb33LH3JNuOfBXt971u0tHe+NURFecQdfjwEj+C+ root@lituus";
   helix = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAKrL6IDHNnHmxi0q9nzu87NOyidPm3HpE7klU368lEf root@helix";
   helix2 = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIK2G81z1E51ioJQGLHnTJEjgSdBqLM6mb72Z+0atE6Bf root@helix";
+  work = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHOnfDvR2D2nGnC+DZYDUXiokzz+eLfZwkp+O8WjWutp anishlakhwara@Anishs-MacBook-Pro.local";
   curve = [ system user ];
   allUserKeys = [ system user mossnet ];
   systemOnly = [ system mossnet lituus helix ];
@@ -34,4 +35,6 @@ in
   "box-wg.age".publicKeys = [ mossnet ];
   "wallabag-password.age".publicKeys = [ mossnet ];
   "wallabag-secret.age".publicKeys = [ mossnet ];
+
+  "work-wg.age".publicKeys = [ work user system ];
 }