feat: add animations and error/loading states to TimelineOutline component

[prabhuignoto]

Description

• Refactoring timeline outline component
• Added missing test cases
• Modularized timeline elements

Additional context

---

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
react-chrono-uc7v	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 30, 2025 9:13pm

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
dist/react-chrono.js	23.76 KB (-29.57% 🔽)	476 ms (-29.57% 🔽)	89 ms (+105.27% 🔺)	565 ms
dist/react-chrono.esm.js	23.86 KB (-25.99% 🔽)	478 ms (-25.99% 🔽)	88 ms (+85.14% 🔺)	566 ms
dist/react-chrono.umd.js	26.06 KB (-27.91% 🔽)	522 ms (-27.91% 🔽)	83 ms (+65.49% 🔺)	604 ms

[sonarqubecloud]

Quality Gate passed

Issues
4 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud