Add wallet balance widget to the profile menu (after Billing)

Wallet balance peek rendered as a menu row directly under Billing, backed by
a /wallet/balance endpoint (BillingClient) and guarded by Route::has. Also
opens Afia via a direct window event for reliability.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

resources/views/partials/topbar.blade.php

@@ -79,7 +79,7 @@
                     <svg class="h-4 w-4 text-slate-500" fill="none" stroke="currentColor" stroke-width="2" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" d="m19 9-7 7-7-7"/></svg>
                 </button>
                                 <div x-show="profileOpen" x-cloak x-transition @click.outside="profileOpen = false"
-                     class="absolute right-0 z-50 mt-2 w-56 rounded-xl border border-slate-200 bg-white shadow-lg">
+                     class="absolute right-0 z-50 mt-2 w-64 rounded-xl border border-slate-200 bg-white shadow-lg">
                     @include('partials.user-profile-menu', [
                         'items' => \App\Support\UserProfileMenu::items($u),
                     ])