Remove dark mode and fix boot splash HTML breakage.

Drop dark-mode toggle, fd-theme storage, and Tailwind dark variant to match sibling Ladill apps. Include boot splash in app-layout instead of regex middleware that truncated the body tag on Alpine x-init.

Co-authored-by: Cursor <cursoragent@cursor.com>

bootstrap/app.php

@@ -21,7 +21,6 @@ return Application::configure(basePath: dirname(__DIR__))
             'redirect' => $request->fullUrl(),
         ]));
         $middleware->web(append: [
-            \App\Http\Middleware\InjectBootSplash::class,
             SetActingAccount::class,
         ]);
         $middleware->alias([