Standardize formatting across multiple init files: expand
single-line use-package keywords onto separate lines, fix
indentation, remove outdated comments, and clean up whitespace. Also
adds mc/keymap <return> binding and improves fcitx5 startup logic in
EXWM.
- Remove consult-dir, nerd-icons-completion, org-contrib and some other unused package
- Delete init-org-refile.el and related keybindings
- Prune EMMS config
- Remove EXWM flatpak launcher helpers (vscodium, localsend, steam)
- Extract Windows dirvish video preview fix to standalone module
- Drop built-in settings moved elsewhere (startup defaults, whitespace, etc.)
- Clean up trailing whitespace / process list prettify configs
