Improve test coverage and unify file names

[KubrickCode]

Goal: Unify test file names to .spec.ts and improve coverage

Task Checklist:

• Rename all .test.ts files to .spec.ts
• Add ConfigManager tests (target: 80%+)
• Add TerminalManager tests
• Enhance keyboard-layout-converter tests
• Add Web-view custom hooks tests
• Update Jest configuration
• Run tests and check coverage

Verification Method:

1. All tests pass
2. Overall coverage 70% or higher
3. ConfigManager coverage 80% or higher

Independently Deployable: ✅ (Test improvement, no functional changes)

[KubrickCode]

🎉 This issue has been resolved in version 0.3.0 🎉

The release is available on GitHub release

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