Test : studentprofile theme contrast

[pari7maheshwari]

Description

Fixes #2905

This PR adds isolated unit tests for the StudentProfile model focusing on dark and light mode visual consistency. It ensures schema-level data safety and verifies that profile fields remain readable and visually stable across different theme presets.

Key validations include:

• Theme preset structure integrity (dark/light)
• WCAG-compliant contrast ratio enforcement
• Consistent foreground/background mapping
• Safe rendering of profile fields (name, email, skills, education)
• Overlay transparency validation to prevent readability issues

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 (Test-only changes — no UI modifications)

Checklist before requesting a review:

• I have read the CONTRIBUTING.md file.
• I have tested these changes locally (npx vitest run).
• I have run npm run format and npm run lint locally and resolved all errors.
• My commits follow the Conventional Commits format (e.g., test(models): ...).
• I have updated README.md if required (not applicable for tests).
• 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 (not applicable to tests).
• (Recommended) I joined the CommitPulse Discord community for contributor discussions, mentorship, and faster PR support.

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