test: cover diff CLI path utils and CI json export progress

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Summary

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

Risky behavior now covered

• diff_tool.cli_utils: PowerShell-style mangled path normalization (normalize_path_arg) and KOTOR install detection via case-aware chitin.key lookup (is_kotor_install_dir, from Case aware application Case-aware application #151).
• resource_json._supports_live_progress: Ensures JSON export logs percentage milestones through the logger in CI/automation instead of TTY \r live updates (fix from json-export progress commit).

Test files added/updated

• Libraries/PyKotor/tests/diff_tool/test_cli_utils.py (new)
• Libraries/PyKotor/tests/cli/test_json_commands.py (CI/TTY progress helpers)

Why this reduces regression risk

• Diff CLI and installation workflows depend on correct path parsing on Windows; mangled-quote handling is easy to break during refactors.
• Case-mismatched install roots are common on Linux/macOS modding setups; install detection must keep resolving chitin.key after the CaseAwarePath migration.
• CI log assertions for JSON export regress silently if live progress re-enables under fake TTYs—these tests lock the automation-friendly logging path.

Validation

pytest Libraries/PyKotor/tests/diff_tool/test_cli_utils.py \
  Libraries/PyKotor/tests/cli/test_json_commands.py::test_supports_live_progress_disables_in_ci \
  Libraries/PyKotor/tests/cli/test_json_commands.py::test_supports_live_progress_requires_tty_when_not_in_ci

13 tests passed locally.

  

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✅ Version Check: Passed

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