fix(nix,nvim): drop nodePackages.* (removed from nixpkgs), drop github-copilot-cli (broken)

nodePackages was removed wholesale from nixpkgs; everything that lived
under it must be referenced via its top-level name or dropped.

- prettier: moved nodePackages.prettier -> prettier (top-level alias).
- jsonlint: not available at top level. Dropped from nix/common.nix
  AND from the nvim-lint and conform-nvim configs in
  dot_config/nvim/lua/plugins/lsp.lua. jsonls already provides
  schema-aware diagnostics; jq still handles formatting. The
  jsonlint redundancy is acceptable to lose.
- github-copilot-cli (1.0.40 in nixpkgs): buildNpmPackage derivation
  doesn't redirect HOME during npm postinstall, so it fails with
  EACCES on /var/empty/.cache on Determinate nix. Removed; install
  manually from https://github.com/github/copilot-cli into
  /usr/local/bin/ as before (current host already has it there).

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