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

src/Http/Controllers/ShowcaseAssetController.php

@@ -104,6 +104,25 @@ class ShowcaseAssetController
         return route('livewire-material.stylesheet', ['hash' => self::hash(self::build())]);
     }
 
+    /**
+     * The application's Vite entries (`livewire-material.showcase.vite`) the showcase's own pages
+     * pass to `@vite()`: every one but a stylesheet — a path Laravel's Vite itself treats as CSS —
+     * since those pages draw their CSS from `url()`'s bundle alone. An application's CSS entry
+     * would load Tailwind for nothing, or the package's stylesheets a second time. Empty when the
+     * list names only stylesheets, and then the page skips `@vite()` altogether (it would read a
+     * build manifest for nothing). A JavaScript entry that imports a stylesheet itself still
+     * brings it: Vite links a chunk's own CSS.
+     *
+     * @return list<string>
+     */
+    public static function scripts(): array
+    {
+        return array_values(array_filter(
+            (array) config('livewire-material.showcase.vite', []),
+            fn (mixed $entry): bool => is_string($entry) && preg_match('/\.(css|less|sass|scss|styl|stylus|pcss|postcss)(\?[^\.]*)?$/', $entry) !== 1,
+        ));
+    }
+
     protected static function build(): string
     {
         $files = [self::path('all.css'), self::path('showcase.css')];