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>

home/profiles/kitty/kitty.conf

@@ -0,0 +1,14 @@
+include ayu.conf
+font_family      Hermit
+font_size        13
+bold_font        auto
+italic_font      auto
+bold_italic_font auto
+open_url_with default
+mouse_map left click ungrabbed mouse_click_url_or_select
+confirm_os_window_close 0
+enable_audio_bell no
+hide_window_decorations titlebar-only
+-- Allows zen-mode.nvim to increase font size
+-- allow_remote_control socket-only
+-- listen_on unix:/tmp/kitty