test: add empty fallback coverage for CustomizeCTA

[deepsikha-dash]

Description

Added empty fallback test coverage for CustomizeCTA to verify component stability when translation values are empty, undefined, or missing. The new tests ensure the CTA structure and navigation link remain available without runtime failures.

Fixes #4211

Pillar

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

Visual Preview

N/A

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]

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

A member of the Team first needs to authorize it.

[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	3433.84 KB	3433.84 KB	0 B
Total CSS	258.05 KB	258.05 KB	0 B

[Aamod007]

This is blocked by the Vercel deployment authorization check rather than a code problem. Please authorize the linked deploy, rerun checks, and then we can take another look at the empty-fallback coverage in app/components/CustomizeCTA.empty-fallback.test.tsx.

[Aamod007]

Good fallback coverage for the CTA. app/components/CustomizeCTA.empty-fallback.test.tsx checks empty, undefined, and null-like translations while keeping the customize link and structure intact, which is exactly the kind of regression coverage we want.

[github-actions]

🎉 Congratulations @deepsikha-dash! Your PR has been successfully merged. 🚀

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