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/js/app.js

@@ -302,6 +302,26 @@ Alpine.data('topbarSearch', (config = {}) => ({
     },
 }));
 
+
+// Wallet balance peek for the avatar dropdown.
+Alpine.data('walletWidget', (config = {}) => ({
+    display: '…',
+    async load() {
+        if (! config.url) {
+            this.display = 'View wallet';
+
+            return;
+        }
+        try {
+            const res = await fetch(config.url, { headers: { Accept: 'application/json', 'X-Requested-With': 'XMLHttpRequest' } });
+            const data = await res.json();
+            this.display = data.available ? data.formatted : 'View wallet';
+        } catch (e) {
+            this.display = 'View wallet';
+        }
+    },
+}));
+
 window.Alpine = Alpine;
 registerLadillConfirmStore(Alpine);