Preserve cookie security attributes in updateCookies round-trip

Chromium's Cookies() API can lose or normalize Secure, SameSite, and
HttpOnly attributes during the AddCookies → navigate → Cookies()
round-trip. This caused cookies like cf_clearance (set with
Secure=true, SameSite=None) to be overwritten with Chromium's defaults
(Secure=false, SameSite=Lax).

Now updateCookies() looks up existing cookies in the jar first. For
cookies that already exist, only Value and Expires are updated —
security attributes are preserved from the original. New cookies from
the server are still written with all their attributes.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

playwright.go

@@ -219,11 +219,35 @@ func (b playWrightBrowser) updateCookies(_ context.Context, page playwright.Page
 			return fmt.Errorf("error getting cookies from browser: %w", err)
 		}
 
+		// Build a lookup of existing cookies so we can preserve their security
+		// attributes. Chromium's Cookies() API can lose or normalize Secure,
+		// SameSite, and HttpOnly during the AddCookies → navigate → Cookies()
+		// round-trip, so we only update Value and Expires for cookies that
+		// already exist in the jar.
+		existing, err := b.cookieJar.Get(page.URL())
+		if err != nil {
+			return fmt.Errorf("error getting existing cookies from jar: %w", err)
+		}
+		type cookieKey struct{ Name, Path string }
+		existingMap := make(map[cookieKey]Cookie, len(existing))
+		for _, c := range existing {
+			existingMap[cookieKey{c.Name, c.Path}] = c
+		}
+
 		for _, cookie := range cookies {
 			// TODO: add support for deleting cookies from the jar which are deleted in the browser
-			err = b.cookieJar.Set(playwrightCookieToCookie(cookie))
+			c := playwrightCookieToCookie(cookie)
 
-			if err != nil {
+			if prev, ok := existingMap[cookieKey{c.Name, c.Path}]; ok {
+				// Preserve the original security attributes; only update
+				// Value and Expires which are the fields that legitimately
+				// change during navigation.
+				c.Secure = prev.Secure
+				c.HttpOnly = prev.HttpOnly
+				c.SameSite = prev.SameSite
+			}
+
+			if err = b.cookieJar.Set(c); err != nil {
 				return fmt.Errorf("error setting cookie in cookie jar: %w", err)
 			}
 		}