test(mongodb): verify User schema behaviors under connection state 2 (connecting) (Variation 1)

[bhoomisingh00079]

Description

Fixes #1409

Added test coverage for MongoDB connection state 2 (connecting) in models/User.test.ts to ensure the User model remains usable while Mongoose is still establishing a connection.

Pillar

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

Visual Preview

Test execution result for the new connection state 2 coverage:

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.

[bhoomisingh00079]

@JhaSourav07 @souravjhahind please review this and authorize.

[Aamod007]

Replaces synthetic connection state tests (state 99, state 0 — both tested locally-defined functions, not production code) with a real state 2 test verifying User model accessibility during connecting state. 8/8 tests pass.

[github-actions]

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