- Add STT_LANGUAGE environment variable (default: auto)
- Modify whisper-cli call to use -l flag with language code
- Add language option to HM module (enum with 23 common languages + auto)
- Update help text to document STT_LANGUAGE variable
Adds package and HM module for quickly opening projects in terminals.
Uses XDG config file instead of environment variables for better
shell-independence and proper NixOS PATH sourcing.
