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>

hosts/darwin/casks/default.nix

@@ -22,6 +22,7 @@
     "wireshark"
     "1password"
     "orbstack"
+    # "aerospace"
 
     # Communication Tools
     # Already installed manually

hosts/darwin/default.nix

@@ -3,7 +3,7 @@
 {
   imports = [
     ./sketchybar
-    ./yabai
+    # ./yabai # Now using aerospace
     # ./casks
     # ../../modules/darwin/home-manager.nix
     # ../../modules/shared
@@ -45,7 +45,7 @@
   };
 
   # Auto upgrade nix package and the daemon service.
-  services.nix-daemon.enable = true;
+  # services.nix-daemon.enable = true; # removed in newer nix-darwin
   nixpkgs.hostPlatform = "aarch64-darwin";
   programs.zsh.enable = true;
 
@@ -55,7 +55,7 @@
     settings.trusted-users = [ "@admin" "anishlakhwara" ];
 
     gc = {
-      user = "root";
+      # user = "root"; # removed in newer nix-darwin
       automatic = true;
       interval = { Weekday = 0; Hour = 2; Minute = 0; };
       options = "--delete-older-than 30d";
@@ -85,11 +85,14 @@
     siji
     font-awesome
     proggyfonts
-    (nerdfonts.override { fonts = [ "FiraCode" "DroidSansMono" "Iosevka" ]; })
+    nerd-fonts.fira-code
+    nerd-fonts.droid-sans-mono
+    nerd-fonts.iosevka
   ];
 
   system = {
     stateVersion = 4;
+    primaryUser = "anishlakhwara";  # required for newer nix-darwin
 
     keyboard = {
       enableKeyMapping = true;