feat(ui): unify resource nav sidebars and polish project layouts

Extract application/database/service configuration sidebars and
unified headings; improve clone-to-environment, embedded deployments,
storage actions, OAuth icons, terminal, and shared form components.

resources/views/livewire/project/application/previews.blade.php

@@ -63,6 +63,11 @@
                         icon-name="sources" />
                 @endforelse
             </div>
+            <div class="w-full" wire:loading wire:target="load_prs">
+                <div class="flex min-h-32 items-center justify-center px-4 py-10">
+                    <x-loading text="Loading pull requests…" />
+                </div>
+            </div>
         </x-application.settings-section>
     @endif