misc tweaks: skhd bnpf bindings, neovim/doom/fish fixes

- skhd: remap window nav/move/resize/stack from hjkl to Emacs-style bnpf;
  remap fullscreen/zoom to m, borders to o, prev/next space to [/];
  add super-z to open emacsclient
- neovim: fix catppuccin integration key (neo_tree -> neotree) so init
  loads without the "module not found" traceback
- doom: disable lispy/objed/parinfer modules
- fish: add ~/.bun/bin to PATH

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

home-manager/modules/neovim.nix

@@ -367,7 +367,7 @@
               gitsigns = true,
               treesitter = true,
               telescope = { enabled = true },
-              neo_tree = true,
+              neotree = true,
               indent_blankline = { enabled = true },
               native_lsp = { enabled = true },
             },