feat(emacs): add org-table-highlight package and configuration

- Added `org-table-highlight` to the list of Emacs packages in Nix.
- Configured `org-table-highlight-mode` in `init.org` to enable it in
  `org-mode` via a hook.

Author: takeokunn

home-manager/packages/emacs/epkgs/packages/org/default.nix

@@ -19,6 +19,7 @@ with epkgs;
   org-ql
   org-sliced-images
   org-preview-html
+  org-table-highlight
 
   # Theme
   org-superstar

home-manager/programs/emacs/elisp/init.org

@@ -4613,6 +4613,14 @@ https://github.com/ch11ng/exwm/wiki#gpg-pinentry
   (with-eval-after-load 'org-preview-html
     (setopt org-preview-html-viewer 'xwidget))
 #+end_src
+*** org-table-highlight
+#+begin_src emacs-lisp :tangle yes
+  (autoload-if-found '(org-table-highlight-mode) "org-preview-html" nil t)
+
+  (with-eval-after-load 'org
+    ;; hooks
+    (add-hook 'org-mode-hook #'org-table-highlight-mode))
+#+end_src
 ** Theme
 *** org-faces
 #+begin_src emacs-lisp :tangle yes