Wrap transport errors as FinTSConnectionError

[mo22]

Network-level failures during dialog initialization currently bubble up as arbitrary exceptions from requests/socket code. FinTSDialog.init catches those broad exceptions and re-raises FinTSDialogInitError with an authentication-focused message, which makes DNS/TLS/TCP failures look like wrong credentials.\n\nThis wraps requests and socket-level failures from FinTSHTTPSConnection.send as FinTSConnectionError. FinTSDialog.init already preserves FinTSConnectionError, so callers can distinguish endpoint/transport failures from authentication failures.\n\nTested with:\n\n uv run --with pytest pytest tests/test_connection.py

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.27%. Comparing base (5ee7548) to head (37c0ac8).
⚠️ Report is 47 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #215      +/-   ##
==========================================
- Coverage   87.69%   86.27%   -1.43%     
==========================================
  Files          26       27       +1     
  Lines        3463     3833     +370     
==========================================
+ Hits         3037     3307     +270     
- Misses        426      526     +100     

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