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>

routes/web.php

@@ -1,6 +1,7 @@
 <?php
 
 use App\Http\Controllers\Auth\SsoLoginController;
+use App\Http\Controllers\WalletBalanceController;
 use App\Http\Controllers\NotificationController;
 use App\Http\Controllers\Public\QrScanController;
 use App\Http\Controllers\Public\TransferPublicController;
@@ -36,6 +37,7 @@ Route::post('/q/{shortCode}/transfer/unlock', [TransferPublicController::class,
 Route::get('/q/{shortCode}/transfer/files/{file}', [TransferPublicController::class, 'download'])->name('qr.public.transfer.download');
 
 Route::middleware(['auth', 'platform.session'])->group(function () {
+    Route::get('/wallet/balance', [WalletBalanceController::class, 'balance'])->name('wallet.balance');
     Route::get('/notifications', [NotificationController::class, 'index'])->name('notifications.index');
     Route::get('/notifications/unread', [NotificationController::class, 'unread'])->name('notifications.unread');
     Route::post('/notifications/{id}/read', [NotificationController::class, 'markAsRead'])->name('notifications.mark-read');