diff --git a/apps/web/playwright.config.ts b/apps/web/playwright.config.ts
index 33372eb..b7a7191 100644
--- a/apps/web/playwright.config.ts
+++ b/apps/web/playwright.config.ts
@@ -14,10 +14,12 @@ export default defineConfig({
 	reporter: [['html', { open: 'never' }], ['list']],
 
 	use: {
-		// Match PUBLIC_APP_URL so the OAuth round-trip (Keycloak → GoTrue → SPA)
-		// lands on the same origin the test started from. When PUBLIC_APP_URL is
-		// a LAN IP (for phone/tablet previews) tests continue to work.
-		baseURL: process.env.PUBLIC_APP_URL ?? 'http://localhost:5173',
+		// Playwright always talks to Vite over the loopback. The LAN IP
+		// variant in `.env` (PUBLIC_APP_URL) is for on-device phone previews
+		// and introduces extra routing latency that produces intermittent
+		// races in the OAuth → optimistic-write path; e2e needs to stay
+		// deterministic regardless of what the dev env has in PUBLIC_APP_URL.
+		baseURL: 'http://localhost:5173',
 		trace: 'on-first-retry',
 		screenshot: 'only-on-failure',
 		// Load anon storage state by default; individual tests override as needed
diff --git a/apps/web/tests/fixtures/login.ts b/apps/web/tests/fixtures/login.ts
index c971185..ecf812d 100644
--- a/apps/web/tests/fixtures/login.ts
+++ b/apps/web/tests/fixtures/login.ts
@@ -18,12 +18,11 @@ export async function loginAs(page: Page, user: (typeof USERS)[keyof typeof USER
 	await page.fill('#password', user.password);
 	await page.click('#kc-login');
 
-	// Wait until we're redirected OFF the callback page. Origin depends on the
-	// PUBLIC_APP_URL the stack is configured with (localhost for plain dev; LAN
-	// IP like http://192.168.1.167:5173 when phones are in the loop).
-	const appOrigin = new URL(process.env.PUBLIC_APP_URL ?? 'http://localhost:5173').origin;
+	// We pin Playwright's baseURL to http://localhost:5173 (see playwright.config.ts)
+	// regardless of whether PUBLIC_APP_URL is the LAN IP for device previews, so
+	// the post-login origin is always localhost.
 	await page.waitForURL(
-		(url) => url.origin === appOrigin && !url.pathname.startsWith('/auth/callback'),
+		(url) => url.origin === 'http://localhost:5173' && !url.pathname.startsWith('/auth/callback'),
 		{ timeout: 20_000 }
 	);
 	await page.waitForFunction(