feat(claude-code): update to version 2.0.25

- Updated `@anthropic-ai/claude-code` package to version 2.0.25.
- Revised hashes in `package.nix` and `package-lock.json` for the new release.
- Added `writableTmpDirAsHomeHook` and `versionCheckHook` for install checks.
- Refined update script to use `--generate-lockfile` and handle unfree dependencies.

overlays/unstable/claude-code/update.sh

@@ -1,15 +1,10 @@
 #!/usr/bin/env nix-shell
-#!nix-shell -i bash -p nodePackages.npm nix-update
+#!nix-shell --pure --keep NIX_PATH -i bash --packages nodejs nix-update git
 
 set -euo pipefail
 
 version=$(npm view @anthropic-ai/claude-code version)
 
-# Generate updated lock file
-cd "$(dirname "${BASH_SOURCE[0]}")"
-npm i --package-lock-only @anthropic-ai/claude-code@"$version"
-rm -f package.json
-
 # Update version and hashes
-cd -
-nix-update claude-code --version "$version"
+AUTHORIZED=1 NIXPKGS_ALLOW_UNFREE=1 nix-update claude-code --version="$version" --generate-lockfile
+nix-update vscode-extensions.anthropic.claude-code --use-update-script --version "$version"