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/user-profile-menu.blade.php

@@ -53,6 +53,8 @@
                @if ($onNavigate) @click="{{ $onNavigate }}" @endif>
                 {{ $item['label'] }}
             </a>
+        @elseif (($item['type'] ?? '') === 'wallet')
+            @includeIf('partials.wallet-widget')
         @elseif (($item['type'] ?? '') === 'logout')
             @if ($variant !== 'sheet')
                 <div class="{{ $dividerClass }}"></div>