chore(web): ignore Instagram in-app browser window.webkit noise in Sentry

iOS Instagram/Meta in-app browsers inject their own JS that probes the
WKWebView bridge (window.webkit.messageHandlers) and throws when absent.
It surfaces via our global onerror but is not our code — pure noise that
scales with Instagram ad traffic. Added to Sentry ignoreErrors. The
existing issue (124551981) was muted in the Sentry UI.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/web/src/lib/sentry.ts

@@ -47,6 +47,13 @@ export async function initSentry() {
         "ResizeObserver loop limit exceeded",
         "ResizeObserver loop completed with undelivered notifications.",
         "Non-Error promise rejection captured",
+        // Instagram/Meta in-app browsers inject their own JS that probes the iOS
+        // WKWebView bridge; it throws when window.webkit is absent. Not our code —
+        // pure noise that scales with Instagram ad traffic.
+        "window.webkit.messageHandlers",
+        "undefined is not an object (evaluating 'window.webkit",
+        // iOS in-app browsers fail to start AudioContext without a user gesture.
+        "Failed to start the audio device",
       ],
     });
     initialized = true;