test: add regressions for case-aware install detection and CI progress reporting

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Summary

Adds targeted regression tests for recently merged production changes where coverage was thin and business risk is meaningful.

Risky behavior now covered

• Case-aware KOTOR install detection (is_kotor_install_dir in diff_tool/cli_utils.py and tslpatcher/diff/engine.py): verifies chitin.key is found even when the install path casing does not match the filesystem (POSIX). Prevents diff/TSLPatcher flows from misclassifying valid installs as plain folders.
• PowerShell path normalization (normalize_path_arg): covers quote stripping, trailing-slash cleanup, and the mangled-path pattern where a trailing backslash escapes the closing quote in PowerShell.
• CI-safe JSON export progress (_supports_live_progress / _ExportProgressReporter): locks in the fix from fix(json-export): log progress when automated so CI / GITHUB_ACTIONS force logger-based progress instead of TTY \r updates that bypass log capture.

Test files added/updated

• Libraries/PyKotor/tests/diff_tool/test_cli_utils.py (new, 11 tests)
• Libraries/PyKotor/tests/cli/test_resource_json_progress.py (new, 10 tests)

Why these tests materially reduce regression risk

• Install detection gates core diff and patching workflows; a regression would silently compare folders instead of full game installs.
• Path normalization bugs surface as "invalid path" failures for common Windows/PowerShell invocations.
• Progress reporting regressions break CI observability for long installation-to-json exports without failing the command.

Validation

QT_QPA_PLATFORM=offscreen uv run pytest --import-mode=importlib -m "not gui and not slow" \
  Libraries/PyKotor/tests/diff_tool/test_cli_utils.py \
  Libraries/PyKotor/tests/cli/test_resource_json_progress.py

All 21 tests pass on Linux (Python 3.13).

  

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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.