test(calculate): add variation 2 multi-week gap timeline coverage

[VarshithaChettipalli]

Description

Fixes #1479

Added an additional test case for a multiple-week contribution gap timeline in lib/calculate.test.ts.

The new test verifies:

• Current streak calculation after a multi-week gap
• Longest streak calculation
• Total contribution count consistency

Pillar

• 🎨 Pillar 1 — New Theme Design
• 📐 Pillar 2 — Geometric SVG Improvement
• 🕐 Pillar 3 — Timezone Logic Optimization
• 🛠️ Other (Bug fix, refactoring, docs)

Visual Preview

Visual Preview: N/A (test-only change)

Checklist before requesting a review:

• I have read the CONTRIBUTING.md file.
• [x ] I have tested these changes locally (localhost:3000/api/streak?user=YOUR_USERNAME).
• I have run npm run format and npm run lint locally and resolved all errors (CI will fail otherwise).
• [x ] My commits follow the Conventional Commits format (e.g., feat(themes): ..., fix(calculate): ...).
• I have updated README.md if I added a new theme or URL parameter.
• I have started the repo.
• I have made sure that i have only one commit to merge in this PR.
• [] The SVG output matches the CommitPulse "premium quality" aesthetic standard (no raw elements, smooth animations, correct fonts).
• (Recommended) I joined the CommitPulse Discord community for contributor discussions, mentorship, and faster PR support.

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[github-actions]

👋 Hey @VarshithaChettipalli, welcome to CommitPulse! 🎉

Thanks for opening your first pull request — this is a big deal and we appreciate the effort!

While you wait for a review, please double-check:

• ✅ You've read the CONTRIBUTING.md checklist
• ✅ npm run lint, npm run format, and npm run test all pass locally
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[Aamod007]

Great work! Code is clean and tests are passing. LGTM!

[github-actions]

🎉 Congratulations @VarshithaChettipalli! Your PR has been successfully merged. 🚀

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