test(AIInsightsSkeleton): add type compiler tests

[ArchiGajera]

Description

This PR adds a dedicated Vitest test suite for components/dashboard/AIInsightsSkeleton.tsx to verify TypeScript Compiler Validation & Schema Constraints Stability. The implementation introduces five isolated and deterministic test cases covering exported interfaces and type definitions using expectTypeOf, validation of required and optional properties, compile-time rejection of invalid prop shapes, successful handling of optional values without type errors, and verification of schema or type constraints. The production implementation remains unchanged, and the tests are designed to be deterministic, CI-friendly, and consistent with the repository's existing testing conventions.

Fixes #7038

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.

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[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	3883.44 KB	3883.44 KB	0 B
Total CSS	323.09 KB	323.09 KB	0 B

[Aamod007]

Hey! Thanks for adding type compiler tests for AIInsightsSkeleton. Exposing exact schema constraints explicitly catches prop validation regressions before they merge.

I'm assigning level:beginner, type:testing, and quality:clean.

Nice work, approving!

[github-actions]

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

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