fix: Persistence on startup

[antonykamp]

Summary

This pull request introduces a small but important improvement to the way conversation states are loaded from the database in quizbot/bot/persistence.py. The change ensures that non-integer states are handled gracefully, preventing potential errors when parsing state values.

• Improved state parsing logic in the _load function: Added a _parse_state helper that attempts to convert row.state to an integer, but returns the original value if conversion fails, allowing for non-integer states to be handled without raising exceptions.

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.14%. Comparing base (19c49ef) to head (0ebadf4).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
quizbot/bot/persistence.py	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #21      +/-   ##
==========================================
- Coverage   86.35%   86.14%   -0.21%     
==========================================
  Files          10       10              
  Lines         623      628       +5     
==========================================
+ Hits          538      541       +3     
- Misses         85       87       +2     

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