Dashboard: silence benign "Transition was skipped" rejection

client/dashboard/app/boot.tsx

@@ -11,6 +11,7 @@ import { handleOAuthCallback } from './auth/oauth-callback';
 import { loadPreferencesHelper } from './dev-tools/preferences';
 import Layout from './layout';
 import { omnibarEvents } from './omnibar/events';
+import { suppressSkippedViewTransitions } from './router/suppress-skipped-view-transitions';
 import limitTotalSnackbars from './snackbars/limit-total-snackbars';
 import type { AppConfig } from './context';
 
@@ -32,6 +33,7 @@ function boot( config: AppConfig ) {
 	loadDevHelpers();
 	loadPreferencesHelper();
 	limitTotalSnackbars();
+	suppressSkippedViewTransitions();
 	initSentry();
 
 	const rootElement = document.getElementById( 'wpcom' );

client/dashboard/app/router/suppress-skipped-view-transitions.ts

@@ -0,0 +1,41 @@
+let isWrapped = false;
+
+/**
+ * TanStack Router drives navigations through `document.startViewTransition()`
+ * but discards the returned `ViewTransition`. When a navigation supersedes an
+ * in-flight one, the browser skips the pending transition and its `ready`
+ * promise rejects with `AbortError: Transition was skipped`, surfacing as an
+ * uncaught promise rejection. Skipping is the correct browser behavior; only
+ * the unhandled rejection is noise.
+ *
+ * Wrap `startViewTransition` once so the transition's promises always have a
+ * handler. Only the skip `AbortError` is swallowed; any other rejection is
+ * re-thrown so real failures stay visible.
+ */
+export function suppressSkippedViewTransitions() {
+	if (
+		isWrapped ||
+		typeof document === 'undefined' ||
+		typeof document.startViewTransition !== 'function'
+	) {
+		return;
+	}
+	isWrapped = true;
+
+	const startViewTransition = document.startViewTransition.bind( document );
+
+	const swallowSkippedTransition = ( error: unknown ) => {
+		if ( error instanceof DOMException && error.name === 'AbortError' ) {
+			return;
+		}
+		throw error;
+	};
+
+	document.startViewTransition = ( ...args: Parameters< typeof startViewTransition > ) => {
+		const transition = startViewTransition( ...args );
+		transition.ready.catch( swallowSkippedTransition );
+		transition.updateCallbackDone.catch( swallowSkippedTransition );
+		transition.finished.catch( swallowSkippedTransition );
+		return transition;
+	};
+}

client/sites/v2/utils/router.ts

@@ -1,10 +1,13 @@
 import pagejs from '@automattic/calypso-router';
 import { createMemoryHistory } from '@tanstack/react-router';
+import { suppressSkippedViewTransitions } from 'calypso/dashboard/app/router/suppress-skipped-view-transitions';
 import UnknownError from '../components/500';
 import type { AnyRoute, AnyRouter } from '@tanstack/react-router';
 import type { AppConfig } from 'calypso/dashboard/app/context';
 
 export function getRouterOptions( config: AppConfig ) {
+	suppressSkippedViewTransitions();
+
 	return {
 		basepath: config.basePath,
 		context: {