Keep the application's stylesheets off the scaffold page too

Plan step 38 review: /material/shell still passed the whole configured
Vite list, so it loaded Tailwind and all.css a second time beside the
showcase bundle. Both frames now take ShowcaseAssetController::scripts():
every entry but a stylesheet, by the same extensions Laravel's Vite
treats as CSS (not only .css), and skip @vite() when nothing is left,
since a list of stylesheets alone would read a build manifest for
nothing. A test renders the overview, a section, a layout page and the
shell against a hot file. The frame's header said the rail collapses
from `lg`; it is `expanded` (840px). The config comment is shorter and
true.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9

tests/Feature/ShowcaseAssetsTest.php

@@ -1,5 +1,6 @@
 <?php
 
+use Illuminate\Support\Facades\Vite;
 use Illuminate\Support\Str;
 use NoNameWeb\LivewireMaterial\Http\Controllers\ShowcaseAssetController;
 use NoNameWeb\LivewireMaterial\Support\Stylesheets;
@@ -104,3 +105,33 @@ it('mounts none of the showcase asset routes when the showcase is off', function
         $this->refreshApplication();
     }
 });
+
+it('passes Vite the application entries but its stylesheets, on every kind of showcase page', function () {
+    $hot = sys_get_temp_dir().'/livewire-material-showcase-hot-'.Str::random(8);
+    file_put_contents($hot, 'http://vite.test');
+    Vite::useHotFile($hot);
+
+    config(['livewire-material.showcase.vite' => ['resources/css/app.css', 'resources/sass/extra.scss', 'resources/js/app.js']]);
+
+    try {
+        expect(ShowcaseAssetController::scripts())->toBe(['resources/js/app.js']);
+
+        foreach (['/material', '/material/progress', '/material/layout/feed', '/material/shell'] as $page) {
+            $this->get($page)
+                ->assertOk()
+                ->assertSee('http://vite.test/resources/js/app.js', false)
+                ->assertDontSee('http://vite.test/resources/css/app.css', false)
+                ->assertDontSee('http://vite.test/resources/sass/extra.scss', false)
+                ->assertSee(ShowcaseAssetController::url(), false);
+        }
+
+        // A list of stylesheets alone leaves @vite() out, rather than reading a manifest for nothing.
+        config(['livewire-material.showcase.vite' => ['resources/css/app.css']]);
+
+        expect(ShowcaseAssetController::scripts())->toBe([]);
+
+        $this->get('/material/progress')->assertOk()->assertDontSee('http://vite.test', false);
+    } finally {
+        unlink($hot);
+    }
+});