Config: Strip down and simplify Emacs config

- 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

lisp/init-exwm.el

@@ -102,21 +102,6 @@
     (desktop-environment-screenshot-partial-command
      "import ~/Pictures/screenshot-$(date +%Y%m%d-%H%M%S).png"))
 
-  (defun vscodium ()
-    "Run VSCodium via shell command asynchronously."
-    (interactive)
-    (start-process-shell-command "vscodium" nil "flatpak run com.vscodium.codium"))
-
-  (defun localsend ()
-    "Run localsend via shell command asynchronously."
-    (interactive)
-    (start-process-shell-command "localsend" nil "flatpak run org.localsend.localsend_app"))
-
-  (defun steam ()
-    "Run Steam via shell command asynchronously."
-    (interactive)
-    (start-process-shell-command "steam" nil "flatpak run com.valvesoftware.Steam"))
-
   (add-hook 'exwm-init-hook
             (lambda ()
               (unless (zerop (shell-command "pgrep -x fcitx5"))