fix(streak): return SVG instead of JSON on validation error

[jatingow]

Description

When the /api/streak endpoint receives invalid query parameters (e.g. a malformed ?user= value that fails streakParamsSchema.safeParse), it returns a JSON response with Content-Type: application/json and status 400 instead of an SVG image.

Fixes #5183

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.
• 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).
• 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.

[vercel]

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

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[Aamod-Dev]

Appreciate you taking the time to submit this PR. I went through the implementation and the approach looks solid.

I'm happy to approve this. Great job!

[Aamod-Dev]

Thanks for the contribution. I went through the changes and everything looks solid. The code is readable, well-structured, and aligns with the project conventions.

I'll go ahead and approve this PR. Thanks again for the contribution!

[Aamod-Dev]

This PR is currently marked with the \status:blocked\ label. Please resolve the blockers so we can proceed with a full review and approval.

[Aamod-Dev]

Thanks for the contribution! I went through the changes and have evaluated them according to the rubric.

[github-actions]

📦 Next.js Bundle Size Report (Gzipped Sizes)

✨ No significant bundle size changes detected.

📊 Summary of Totals

Category	PR Size	Base Size	Difference
Total JS	3405.30 KB	3405.30 KB	0 B
Total CSS	252.94 KB	252.94 KB	0 B

[Aamod-Dev]

Excellent bugfix! I went through the changes and returning an actual SVG error badge instead of JSON when validation fails prevents GitHub profiles from displaying broken image links.
Labels applied:

• level:advanced: Modifies core routing returns.
• quality:clean: Proper SVG compilation.
• ype:bug: Fixes severe image rendering issue.

[github-actions]

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

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