[org][org-brain] Add SPC menu (vim or hybrid style)

Fixes: org-brain doesn't have SPC menu
https://github.com/syl20bnr/spacemacs/issues/13548

CHANGELOG.develop

@@ -2924,6 +2924,7 @@ files (thanks to Daniel Nicolai)
     (thanks to Mariusz Klochowicz)
   - Added keybindings ~SPC a o C f~ and org/agenda local ~SPC m C f~ keybindings
     and changed =clocks= prefixes to =clocks/contacts=
+  - Add =org-brain= buffer, ~SPC~ menu (vim or hybrid style) (thanks to duianto)
 - Made =org= layer depend on =spacemacs-org= (thanks to Eivind Fonn)
 - Remove =mu4e= and =notmuch= from =org= (thanks to Sylvain Benner)
 - Use evil-org from MELPA (thanks to Eivind Fonn)

layers/+emacs/org/packages.el

@@ -613,7 +613,10 @@ Headline^^            Visit entry^^               Filter^^                    Da
         "Bgf" 'org-brain-goto-friend
         "BR"  'org-brain-refile
         "Bx"  'org-brain-delete-entry)
-      (evil-set-initial-state 'org-brain-visualize-mode 'emacs))))
+      (evil-set-initial-state 'org-brain-visualize-mode 'emacs)
+      (when (memq dotspacemacs-editing-style '(vim hybrid))
+        (with-eval-after-load 'org-brain
+          (define-key org-brain-visualize-mode-map (kbd "SPC") 'spacemacs-cmds))))))
 
 (defun org/init-org-expiry ()
   (use-package org-expiry