fix(ui): microseconds diffs result in wrong unread indicator

[esarbanis]

Take into account the lastReadMessageId property

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• [X] The code changes follow best practices
• [X] Code changes are tested (add some information if not applicable)

Description of the pull request

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 60.27%. Comparing base (27cbb03) to head (874a2b3).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1932 +/- ## ========================================== + Coverage 60.24% 60.27% +0.02% ========================================== Files 317 317 Lines 18472 18473 +1 ========================================== + Hits 11128 11134 +6 + Misses 7344 7339 -5 ```

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