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/TerminalPageHeaderTest.php

@@ -54,6 +54,15 @@ it('uses the same padded themed canvas for the active terminal session', functio
         ->toMatch('/\.terminal-session-panel\s*\{[^}]*box-shadow:\s*none;/s');
 });
 
+it('opens the global terminal outside Livewire navigation like resource terminals', function () {
+    $navbar = file_get_contents(resource_path('views/components/navbar.blade.php'));
+
+    expect($navbar)
+        ->toContain('<a title="Terminal"')
+        ->toContain('href="{{ route(\'terminal\') }}"')
+        ->not->toMatch('/<a title="Terminal"[^>]*wireNavigate\(\)/s');
+});
+
 it('uses floating rounded controls instead of the legacy terminal header bar', function () {
     $view = file_get_contents(resource_path('views/livewire/terminal/index.blade.php'));