fix(ccusage): improve project name handling on windows

[vvreutskiy]

Fixes #818

Problem:
Windows project names were incorrectly shortened from C--src--delete--ansible to just C, losing the actual project name.

Solution:
Added proper handling for Windows-style paths in two formats:

• Direct paths: C:\work\project → project
• Escaped paths: C--src--data--project → project

Both cases now extract the last segment as the project name, matching the behavior for Unix-style paths.

Tests:
Added test cases covering both Windows path formats in arbitrary directories.

Summary by CodeRabbit

Release Notes

• Bug Fixes

  • Enhanced project name extraction and normalization from Windows-style file paths, including backslash-separated paths and double-dash segment handling
  • Improved compatibility for Windows directory paths to ensure consistent project name formatting across different path formats

• Tests

  • Expanded test suite with comprehensive coverage for Windows path scenarios and directory structure variations

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[coderabbitai]

📝 Walkthrough

Walkthrough

This change fixes Windows path handling in project name parsing. The implementation adds logic to normalize Windows-style absolute paths (with backslashes) and double-dash segments to correctly extract project names, preventing malformed outputs like single letters or dash-separated paths. Tests are added for these scenarios.

Changes

Cohort / File(s)	Change Summary
Windows path handling and project name parsing apps/ccusage/src/_project-names.ts	Added branches to parseProjectName function to handle Windows absolute paths (backslash-separated) by extracting the last segment and joining with '-'. Added handling for double-dash segments (split on -- and keep last segment). Extended test coverage with C:\Users... style paths and arbitrary directories to verify formatProjectName returns expected results.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Suggested reviewers

• ryoppippi

Poem

🐰 Hops with delight

Windows paths no longer break,
Backslashes now the right way take!
Project names shine bright and clean,
The finest parsing ever seen! 🎯

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main fix: improving project name handling on Windows, which directly addresses the core issue being resolved.
Linked Issues check	✅ Passed	The code changes address the requirements from issue #818 by handling both Windows backslash paths and escaped double-dash paths to extract correct project names.
Out of Scope Changes check	✅ Passed	All changes are focused on Windows path handling for project name extraction, directly aligned with the objectives outlined in issue #818.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing touches

• 📝 Generate docstrings

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