Major optimization refactor, across the board

+ enable lexical-scope everywhere (lexical-binding = t): ~5-10% faster
  startup; ~5-20% general boost
+ reduce consing, function calls & garbage collection by preferring
  cl-loop & dolist over lambda closures (for mapc[ar], add-hook, and
  various cl-lib filter/map/reduce functions) -- where possible
+ prefer functions with dedicated opcodes, like assq (see byte-defop's
  in bytecomp.el for more)
+ prefer pcase & cond (faster) over cl-case
+ general refactor for code readability
+ ensure naming & style conventions are adhered to
+ appease byte-compiler by marking unused variables with underscore
+ defer minor mode activation to after-init, emacs-startup or
  window-setup hooks; a customization opportunity for users + ensures
  custom functionality won't interfere with startup.

modules/app/present/config.el

@@ -1,4 +1,4 @@
-;;; app/present/config.el
+;;; app/present/config.el -*- lexical-binding: t; -*-
 
 ;; Sometimes you just get that urge to show off. I don't have a fancy car, so
 ;; my code or Emacs will have to do.
@@ -68,7 +68,8 @@
     (add-hook! 'org-tree-slide-mode-after-narrow-hook
       #'(+present|detect-slide +present|add-overlays org-display-inline-images))
 
-    (add-hook! 'org-tree-slide-mode-hook
+    (defun +present|org-tree-present-mode ()
+      "TODO"
       (doom/window-zoom)
       (let ((arg (if org-tree-slide-mode +1 -1)))
         (centered-window-mode arg)
@@ -87,8 +88,10 @@
                (set-face-attribute 'org-level-2 nil :height 1.0)
                (+present|remove-overlays)
                (org-remove-inline-images)))))
+    (add-hook 'org-tree-slide-mode-hook #'+present|org-tree-present-mode)
 
     (defun +present*org-tree-slide-narrow-exclude-header (orig-fn &rest args)
+      "TODO"
       (cl-letf (((symbol-function 'org-narrow-to-subtree)
                  (lambda () (save-excursion
                          (save-match-data