Seems common to tweak the header bar (header.blade.php).
Probably worth splitting this down to extra components, with at least:

• View for existing links/buttons.
• Empty view at the start of existing links/button specifically for customization.
  • This would need test to cover like existing customization-only views.
• Could maybe split out logo and search. Not sure there's much desire, but would allow easier moving/removal within header.blade.php overrides.

Already exacted profile menu in b90033a, might be worth thinking through organisation though, rather than bloating common.