Auth session not persisted on MacOS Catalyst apps

[nexelion]

Bug report

• I confirm this is a bug with Supabase, not with my own application.
• I confirm I have searched the Docs, GitHub Discussions, and Discord.

Describe the bug

When using a MacOS catalyst target, the session is not persisted, causing all auth and DB methods to return sessionMissing errors. The same code works fine in iOS targets in a simulator

To Reproduce

Steps to reproduce the behavior, please provide code snippets or a repository:

1. Unzip the following (bare bones) project
   SupabaseCatalystMissingSession.zip
2. Update the supabaseUrl and supabaseKey values inside ContentView.swift to point at your desired supabase instance. which should have an already registered user
3. In Xcode, select the "Mac Catalyst" build target
4. Run the app and login with the valid user credentials
5. Examine the console output, which shows the user being successfully authenticated and then immediately failing to fetch the session.
6. Now attempt the same thing inside an iOS simulator, which will properly fetch the session

Expected behavior

The session should be available after a user has successfully authenticated with supabase.auth.signIn() from a MacOS catalyst app as it is from an iOS app

Screenshots

System information

• OS: MacOS 15.3.2
• supabase-swift: 2.26.1

I see the same problem on #602