Fix sync issue with SSO

Description

Fix sync is disable by default for new login

Screenshots

Technical details

Tests

Issues

https://gitlab.e.foundation/e/os/backlog/-/issues/3713

10 commandments of code review

👪 ❤️ https://gitlab.e.foundation/groups/e/-/wikis/contribute/development-processes/code-review-guidelines

Summary by CodeRabbit

• Bug Fixes

  • More reliable account updates (OAuth or password): existing CardDAV/CalDAV entries are updated in place, sync settings and group method preserved, collections refreshed, and tokens/passwords handled consistently.

• Chores

  • CI now publishes the release-signed APK from build pipelines for easier installation.
  • Release build signing aligned with debug signing to simplify test builds.