fix(replication): Propagate errors on 'paused' from underlying replication

[maralorn]

Overview

Fixes #9197

Testing recommendations

Start a PouchDB .sync against e.g. a non-existent remote. Observe the correct paused event being emitted.

Related Issues or Pull Requests

Fixes #9197

Checklist

• I am not a bot
• This is my own work, I did not use AI, LLM's or similar technology for code or docs generation
  • For full transparency: I typed, committed and tested these changes completely on my own, but Claude found the bug for me and recommended this exact fix.
• Code is written and works correctly
• Changes are covered by tests
• Documentation changes were made in the docs folder

[janl]

thank you for being upfront about your use of LLM tooling.