\test(time): add empty-fallback test and fix timezone mock"

[ShafinNigamana]

Description

Adds a robust empty-fallback test suite for utils/time.ts, refactors getSecondsUntilMidnightInTimezone to safely default to UTC calculations when timezone inputs are missing, empty, or null/undefined, and corrects a pre-existing construction TypeError in utils/time.massive-scaling.test.ts.

Fixes #4308

Pillar

• 🎨 Pillar 1 — New Theme Design
• 📐 Pillar 2 — Geometric SVG Improvement
• 🕐 Pillar 3 — Timezone Logic Optimization
• 🛠️ Other (Bug fix, refactoring, docs) - Adding fallback/unit test coverage

Visual Preview

N/A — Purely a logic / unit testing update. No visual changes.

Checklist before requesting a review:

• I have read the CONTRIBUTING.md file.
• I have tested these changes locally.
• I have run npm run format and npm run lint locally and resolved all errors (CI will fail otherwise).
• 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.

[github-actions]

🚨 Hey @ShafinNigamana, 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:
👉 View CI Run

Once you push a fix and the CI passes, the status:blocked label will be removed automatically. 💪

[Aamod-Dev]

Thanks for the PR. It looks like a good start, but there are a few areas that could use some refinement to ensure long-term maintainability. Let's get these sorted out.

• I noticed some leftover debugging statements (e.g., console.log). Let's make sure to clean those up before merging so they don't clutter the production logs.

Looking forward to seeing the revised version. Thanks for your hard work on this.

[Aamod-Dev]

Thanks for your contribution. The overall direction looks good, but there are a few issues to address:

• I noticed some leftover debugging statements (console.log). Please remove them before we can merge this.

Let me know when you've updated the PR!

[Aamod-Dev]

Thanks for the contribution. I went through the changes and the overall approach looks good. The fallback logic for missing timezones is well implemented, and the tests clearly cover the edge cases. I'll go ahead and approve this PR. Thanks again for the contribution.

[github-actions]

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

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