style(config): Reformat Emacs Lisp code for consistency

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indentation, remove outdated comments, and clean up whitespace.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.

lisp/init-window.el

@@ -5,9 +5,13 @@
 ;;; Code:
 
 (use-package popper
-  :defines popper-echo-dispatch-actions
-  :commands popper-group-by-directory
-  :hook (emacs-startup . popper-mode)
+  :defines
+  popper-echo-dispatch-actions
+  :commands
+  popper-group-by-directory
+  :hook
+  (emacs-startup . popper-mode)
+  
   :init
   (setq popper-reference-buffers
         '("\\*Messages\\*"