feat(themes): add gruvbox preset with dark palette

[gazala-hafsa7]

Description

Fixes #148

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:

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

[vercel]

@gazala-hafsa7 is attempting to deploy a commit to the jhasourav07's projects Team on Vercel.

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[github-actions]

👋 Hey @gazala-hafsa7, 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
• ✅ Your PR has a visual preview if it touches any SVG output
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A maintainer will review your PR shortly. Hang tight! 🚀

[gazala-hafsa7]

completed the CI pipeline/format . lint type check!

[JhaSourav07]

@gazala-hafsa7

Hey one CI is failing

[JhaSourav07]

use npm run format
make sure to keep the pr focused on one commit

[gazala-hafsa7]

@JhaSourav07 i have done the npm run format
And npm run lint and npm run test after it showed the CI failed.

[github-actions]

🚨 Hey @gazala-hafsa7, 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. 💪

[gazala-hafsa7]

@JhaSourav07, the CI check has now passed. Can you remove the blocked status?

[JhaSourav07]

last thing is
can you keep the PR focused in one commit

after that i will merge it

[gazala-hafsa7]

@JhaSourav07 i have made it so that it has only one commit can u merge the PR, so that i can work on the other assigned issue.

[github-actions]

🎉 Congratulations @gazala-hafsa7! Your PR has been successfully merged. 🚀

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