test: cover case-aware install detection and CI json export progress

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Summary

Adds regression tests for recently merged production changes that lacked direct coverage.

Risky behavior now covered

• Case-aware KOTOR install detection (is_kotor_install_dir in diff_tool/cli_utils, tools/patching, and tslpatcher/diff/engine): verifies chitin.key is found even when directory or key casing differs on case-sensitive filesystems (the behavior introduced in Case-aware application #151).
• PowerShell path normalization (normalize_path_arg): guards against quote-escape mangling and trailing-slash issues that break diff/CLI path inputs on Windows.
• JSON export progress in CI (_supports_live_progress / _ExportProgressReporter): ensures automation env vars (CI, GITHUB_ACTIONS) disable live \r stderr updates and route progress through logger output instead (fix from json-export regression).

Test files added/updated

• Libraries/PyKotor/tests/diff_tool/test_cli_utils.py (new, 7 tests)
• Libraries/PyKotor/tests/cli/test_resource_json_progress.py (new, 11 tests)

Why these tests materially reduce regression risk

Install-directory detection is on the critical path for diff, patch, and CLI workflows; a regression would silently treat valid game roots as invalid. Path normalization bugs are a common Windows support issue. CI progress behavior affects observability in GitHub Actions — live TTY updates bypass structured logging and break caplog-based tests.

Validation

QT_QPA_PLATFORM=offscreen uv run pytest --import-mode=importlib --timeout=120 \
  Libraries/PyKotor/tests/diff_tool/test_cli_utils.py \
  Libraries/PyKotor/tests/cli/test_resource_json_progress.py -v

All 18 tests pass.

  

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🔨 Build Validation Summary

✅ Version Check: Passed

Tool Builds

⚠️ HoloPatcher: cancelled
⚠️ HoloPazaak: cancelled
⚠️ HolocronToolset: cancelled
⚠️ KotorDiff: cancelled
⚠️ KotorMCP: cancelled

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🎉 All builds validated successfully! This PR is ready for merge.