fix(ui): polish create flows and terminal navigation

Open the global terminal outside Livewire navigation, clarify that
image tag and SHA256 digest are mutually exclusive, inset the GitLab
empty state, and show loading on Dockerfile create. Add regression tests.

tests/Feature/GitlabAppAuthorizationTest.php

@@ -46,6 +46,12 @@ beforeEach(function () {
 });
 
 describe('GitLab App authorization', function () {
+    test('empty gitlab app state is inset from the section edges', function () {
+        $view = file_get_contents(resource_path('views/livewire/project/new/gitlab-private-repository.blade.php'));
+
+        expect($view)->toContain("<div class=\"application-settings-section-body\">\n                <x-empty title=\"No GitLab Apps\"");
+    });
+
     test('unrelated users cannot inspect system-wide source secrets in the component payload', function () {
         $otherTeam = Team::factory()->create();
         $systemWideSource = GitlabApp::create([