fix(ui): replace the project layer-2 bar with a page header

The project navbar rendered a single Resources tab that was only ever active
on project.resource.index, a page that never rendered the bar, and rendered
nothing at all without an environment, leaving project and environment
settings with no title.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

tests/Feature/ResourceHeadingUnifiedNavbarTest.php

@@ -470,7 +470,6 @@ it('shows application and service Links on mobile headings', function () {
 it('uses overflow scroll arrows on resource heading navbars', function () {
     $files = [
         resource_path('views/livewire/server/navbar.blade.php'),
-        resource_path('views/components/project/navbar.blade.php'),
     ];
 
     foreach ($files as $path) {