chore(nix): add basedpyright to development shell

Added basedpyright as a build input to the Nix devShell to provide
IDE support for Python type checking. This tool complements the
existing mypy hooks and improves developer experience with real-time
type feedback in editors.

Author: ryoppippi

flake.nix

@@ -84,6 +84,7 @@
               nixfmt-rfc-style
               typos
               typos-lsp
+              basedpyright
             ];
 
             shellHook = ''