Revert "Disable partitioned cookies for Safari due to WebKit bugs (#5843)"

This reverts commit fbd8bbbeaa.

src/pretix/helpers/cookies.py

@@ -34,10 +34,7 @@ def set_cookie_without_samesite(request, response, key, *args, **kwargs):
     if not is_secure:
         # https://www.chromestatus.com/feature/5633521622188032
         return
-
-    useragent = request.headers.get('User-Agent', '')
-
-    if should_send_same_site_none(useragent):
+    if should_send_same_site_none(request.headers.get('User-Agent', '')):
         # Chromium is rolling out SameSite=Lax as a default
         # https://www.chromestatus.com/feature/5088147346030592
         # This however breaks all pretix-in-an-iframe things, such as the pretix Widget.
@@ -47,29 +44,8 @@ def set_cookie_without_samesite(request, response, key, *args, **kwargs):
         # This will only work on secure cookies as well
         # https://www.chromestatus.com/feature/5633521622188032
         response.cookies[key]['secure'] = is_secure
-
-        if can_send_partitioned_cookie(useragent):
-            # CHIPS
-            response.cookies[key]['Partitioned'] = True
-
-
-def can_send_partitioned_cookie(useragent):
-    # Safari currently exhibits a bug where Partitioned cookies (CHIPS) are not
-    # sent back to the originating site after multi-hop cross-site redirects,
-    # breaking SSO login flows in pretix.
-    #
-    # Partitioned cookies were initially introduced in Safari 18.4, removed
-    # again in 18.5 due to a bug, and reintroduced in Safari 26.2, where the
-    # current issue is present.
-    #
-    # Once the Safari issue is fixed, this check should be refined to be
-    # conditional on the affected versions only.
-    #
-    # WebKit issues:
-    #
-    #   - https://bugs.webkit.org/show_bug.cgi?id=292975
-    #   - https://bugs.webkit.org/show_bug.cgi?id=306194
-    return not is_safari(useragent)
+        # CHIPS
+        response.cookies[key]['Partitioned'] = True
 
 
 # Based on https://www.chromium.org/updates/same-site/incompatible-clients