chore: prevent UnicodeEncodeError crashing error logging on Windows consoles

[Cristhianzl]

On Windows CI, the e2e test validate-raise-errors-components.spec.ts fails
deterministically — it times out waiting for the error popup text
THIS IS A TEST ERROR MESSAGE to appear, even with the wait already bumped to
30s on release-1.10.0 (all 4 attempts failed).

Summary by CodeRabbit

• Bug Fixes

  • Improved logging resilience for environments with limited character encoding support. The system now gracefully handles Unicode characters that cannot be encoded, replacing them with backslash representations instead of crashing.

• Tests

  • Added comprehensive unit tests for stream resilience and exception logging in restricted encoding environments.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

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Review profile: CHILL

Plan: Pro

Run ID: 2546a6ff-34dd-41b0-9d9a-d6b1c33c0803

📥 Commits

Reviewing files that changed from the base of the PR and between cc97a32 and 75d7ab6.

📒 Files selected for processing (4)

• src/lfx/src/lfx/log/__init__.py
• src/lfx/src/lfx/log/_streams.py
• src/lfx/tests/unit/log/__init__.py
• src/lfx/tests/unit/log/test_streams.py

---

Walkthrough

This PR adds Unicode encoding resilience to stdout and stderr by reconfiguring them to use errors="backslashreplace" during module initialization. The implementation handles Windows cp1252 console encoding and other limited encodings to prevent UnicodeEncodeError when writing non-ASCII characters. Tests verify the reconfiguration works, exception logging succeeds, and the feature is safe when streams are unavailable.

Changes

Stream Resilience Feature

Layer / File(s)	Summary
Core stream resilience implementation src/lfx/src/lfx/log/_streams.py	Defines _reconfigure() helper to conditionally call reconfigure(errors="backslashreplace") on a stream if available, suppressing exceptions. The public make_streams_resilient() function applies reconfiguration to sys.stdout, sys.stderr, sys.__stdout__, and sys.__stderr__.
Module initialization hook src/lfx/src/lfx/log/__init__.py	Imports make_streams_resilient from _streams and calls it at module load time, ensuring encoding resilience is active when the logging module is imported.
Test coverage for stream resilience src/lfx/tests/unit/log/__init__.py, src/lfx/tests/unit/log/test_streams.py	Helper _cp1252_stream() creates test streams mimicking Windows cp1252 encoding. Tests verify make_streams_resilient() reconfigures both stdout/stderr to backslashreplace, exception logging via structlog does not crash on cp1252 streams, and the function safely handles None streams.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Suggested labels

test

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cz/fix-folder-tests-win

---

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[github-actions]

✅ Test Coverage Advisor

No source changes detected without accompanying tests. Thanks for keeping coverage up! 🎉

Advisory check only — never blocks merge.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.32%. Comparing base (16f7331) to head (75d7ab6).
⚠️ Report is 5 commits behind head on release-1.10.0.

Additional details and impacted files

@@                Coverage Diff                 @@
##           release-1.10.0   #13482      +/-   ##
==================================================
- Coverage           57.76%   48.32%   -9.44%     
==================================================
  Files                2271     2129     -142     
  Lines              216876   204411   -12465     
  Branches            32450    14576   -17874     
==================================================
- Hits               125272    98779   -26493     
- Misses              90185   104212   +14027     
- Partials             1419     1420       +1     

Flag	Coverage Δ
backend	64.83% <ø> (-0.01%)	⬇️
frontend	42.56% <ø> (-14.62%)	⬇️
lfx	52.87% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/lfx/src/lfx/log/_streams.py	100.00% <100.00%> (ø)

... and 1077 files with indirect coverage changes

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[github-actions]

Frontend Unit Test Coverage Report

Coverage Summary

Lines	Statements	Branches	Functions
	42.56% (56406/132506)	69.25% (7639/11030)	41% (1263/3080)

Unit Test Results

Tests	Skipped	Failures	Errors	Time
4874	0 💤	0 ❌	0 🔥	16m 6s ⏱️