test(cache): verify TTLCache behavior for infinite TTL value (#1400)

[swarupio]

Description

Added a specific test case in lib/cache.test.ts to verify that setting a cache value with an Infinity TTL is handled robustly. The test ensures that passing Infinity does not throw an error, successfully sets the value, and restricts expiration to a realistic maximum threshold without breaking internal Date calculations, satisfying all acceptance criteria for the issue.

Fixes #1400

Pillar

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

Visual Preview

Checklist before requesting a review:

[x] I have read the CONTRIBUTING.md file.

[x] I have tested these changes locally (localhost:3000/api/streak?user=YOUR_USERNAME).

[x] 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): ...).

[x] I have updated README.md if I added a new theme or URL parameter.

[x] I have started the repo.

[x] I have made sure that i have only one commit to merge in this PR.

[x] The SVG output matches the CommitPulse "premium quality" aesthetic standard (no raw elements, smooth animations, correct fonts).

[x] (Recommended) I joined the CommitPulse Discord community for contributor discussions, mentorship, and faster PR support.

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[github-actions]

🚨 Hey @swarupio, the CI Pipeline is failing on this PR and it has been marked as status:blocked.

Please fix the issues before this can be reviewed. Here's how:

1. Run checks locally before pushing:

npm run format:check   # Check Prettier formatting
npm run lint           # Run ESLint
npm run typecheck      # TypeScript type check
npm run test           # Run unit tests (Vitest)
npm run build          # Verify production build passes

2. Auto-fix common issues:

npm run format         # Auto-fix formatting with Prettier
npm run lint -- --fix  # Auto-fix lint errors where possible

3. Check the full failure log here:
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Once you push a fix and the CI passes, the status:blocked label will be removed automatically. 💪

[github-actions]

⚠️ Hey @swarupio, this PR has merge conflicts with the main branch.

Please pull the latest changes and resolve the conflicts so we can review it!

git fetch origin
git rebase origin/main
# resolve any conflicts, then:
git push --force-with-lease

Once resolved, the needs-rebase label will be removed automatically on the next check. 🙌

[github-actions]

⚠️ Hey @swarupio, this PR has merge conflicts with the main branch.

Please pull the latest changes and resolve the conflicts so we can review it!

git fetch origin
git rebase origin/main
# resolve any conflicts, then:
git push --force-with-lease

Once resolved, the needs-rebase label will be removed automatically on the next check. 🙌