Complete the showcase and record Phase 10

Shows the plain tooltip on its own, checks that every component appears
in the showcase, and records the namespace change and the fresh
application check in the plan.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V9NnLxnPp8vaaurb3Z1MFy

tests/Feature/ShowcaseTest.php

@@ -1,5 +1,6 @@
 <?php
 
+use Illuminate\Support\Facades\File;
 use NoNameWeb\LivewireMaterial\Support\SvgFile;
 
 /**
@@ -68,3 +69,17 @@ it('previews a sample mail in the package theme', function () {
         ->assertSee('border-radius: 9999px', false)
         ->assertSee('Unsubscribe');
 });
+
+it('shows every component somewhere in the showcase', function () {
+    $showcase = collect(File::allFiles(__DIR__.'/../../resources/views/showcase'))
+        ->map(fn (SplFileInfo $file): string => $file->getContents())
+        ->implode("\n");
+
+    $absent = collect(File::files(__DIR__.'/../../resources/views/components'))
+        ->map(fn (SplFileInfo $file): string => $file->getBasename('.blade.php'))
+        ->reject(fn (string $name): bool => preg_match('/<x-(?:livewire-material::)?'.preg_quote($name, '/').'[\s\/>]/', $showcase) === 1)
+        ->values()
+        ->all();
+
+    expect($absent)->toBe([]);
+});