test(navbar): add massive scaling coverage for render and interaction stability

[Thacker-Meet]

Description

Fixes #4333

Added a dedicated massive-scaling test suite for app/components/navbar.tsx.

Coverage Added

• Verifies repeated Navbar renders complete successfully without DOM instability.
• Tests high-volume mobile menu toggle interactions and state transitions.
• Confirms navigation structure remains intact when many Navbar instances are rendered.
• Validates render performance during repeated mount/unmount cycles.
• Ensures menu functionality remains stable after extensive interaction sequences.

The test suite focuses on realistic scaling scenarios based on actual Navbar behavior, validating rendering stability, interaction reliability, responsive menu state management, and performance under heavy usage patterns.

Pillar

• 🛠️ Other (Bug fix, refactoring, docs)

Visual Preview

• N/A – Test-only changes.

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 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.

[Aamod-Dev]

Thanks for the contribution. I went through the changes and the overall approach looks good.

[github-actions]

🎉 Congratulations @Thacker-Meet! Your PR has been successfully merged. 🚀

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