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>

.direnv/bin/nix-direnv-reload

@@ -1,19 +0,0 @@
-#!/usr/bin/env bash
-set -e
-if [[ ! -d "/home/anish/usr/helm" ]]; then
-  echo "Cannot find source directory; Did you move it?"
-  echo "(Looking for "/home/anish/usr/helm")"
-  echo 'Cannot force reload with this script - use "direnv reload" manually and then try again'
-  exit 1
-fi
-
-# rebuild the cache forcefully
-_nix_direnv_force_reload=1 direnv exec "/home/anish/usr/helm" true
-
-# Update the mtime for .envrc.
-# This will cause direnv to reload again - but without re-building.
-touch "/home/anish/usr/helm/.envrc"
-
-# Also update the timestamp of whatever profile_rc we have.
-# This makes sure that we know we are up to date.
-touch -r "/home/anish/usr/helm/.envrc" "/home/anish/usr/helm/.direnv"/*.rc