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.

tests/Feature/EmptyStateBackgroundTest.php

@@ -0,0 +1,21 @@
+<?php
+
+use Illuminate\Support\Facades\Blade;
+
+it('uses the Coolify base background for all empty states', function () {
+    $html = Blade::render('<x-empty title="Nothing found" />');
+    $css = file_get_contents(resource_path('css/app.css'));
+
+    expect($html)
+        ->toContain('empty-state')
+        ->not->toContain('bg-neutral-50')
+        ->not->toContain('dark:bg-white/[0.02]')
+        ->and($css)
+        ->toContain('.application-settings-section-body:has(> .empty-state:only-child)')
+        ->toContain('.application-settings-section-body.is-flush:has(> .empty-state:only-child)')
+        ->toContain('padding: 1rem;')
+        ->toContain('.empty-state')
+        ->toContain('background: var(--coollabs-base);')
+        ->toContain('.loading-state-card')
+        ->toContain('border: 1px dashed var(--coollabs-line);');
+});