Replace Laravel scaffold logo with a finance-themed mark

The app still shipped the default Laravel cube icon. New mark is a
coin outline crossed by a rising trend line — ties the app's subject
(money) to its purpose (tracking growth over time). Stroke-based
single-color design inherits currentColor from the caller's text-*
class, so it drops into the existing light/dark tokens without a
separate variant.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

resources/views/layouts/guest.blade.php

@@ -20,7 +20,7 @@
         <div class="min-h-screen flex flex-col sm:justify-center items-center pt-6 sm:pt-0 bg-surface-alt">
             <div>
                 <a href="/" wire:navigate aria-label="{{ config('app.name', 'Laravel') }} — Accueil">
-                    <x-application-logo class="w-20 h-20 fill-current text-text-muted" />
+                    <x-application-logo class="w-20 h-20 text-text-muted" />
                 </a>
             </div>