fix: add missing 14-day streak milestone

[Suprita736]

📝 Pull Request Description

Related Issue

Closes #2290

Summary

Added the missing 14-day streak milestone so the existing "14-Day Streak" achievement can be unlocked when a user reaches a 14-day consecutive streak.

Also added unit test coverage for the 14-day streak milestone while preserving the existing 3-day, 7-day, and 30-day streak behavior.

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Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature
• ♻️ Refactoring
• 📝 Documentation update
• 🎨 UI/UX improvement
• 🔥 Other(please describe) ______

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How Has This Been Tested?

• Added unit test coverage for the 14-day streak milestone.
• Verified that reaching a 14-day streak unlocks the existing "14-Day Streak" achievement.
• Verified that the existing 3-day, 7-day, and 30-day streak milestones remain unchanged.
• Ran the relevant streak tracker tests successfully.

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Screenshots (if applicable)

Not applicable — this is a backend logic and test coverage fix.

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Checklist

• My code follows the project's guidelines
• I have tested my changes
• I have updated documentation where necessary
• I have linked the related issue
• My changes do not introduce new warnings or errors

Adds the missing 14-day streak milestone.

Updates include:

• Adds the "14-Day Streak" milestone in backend/utils/streakTracker.js.
• Adds unit tests for 3-, 7-, 14-, and 30-day streak achievements.
• Verifies duplicate achievements are not added.
• Verifies UTC day differences and missed-streak resets.

[github-actions]

Thank you for submitting your pull request, @Suprita736! 🙌
We'll review it as soon as possible.
If there are any specific instructions or feedback regarding your PR, we'll provide them here.
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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 2c8302ce-3a29-4fa0-88d8-9e3da6288fd7

📥 Commits

Reviewing files that changed from the base of the PR and between 23d4b29 and 9a57aee.

📒 Files selected for processing (2)

• backend/tests/streakTracker.unit.test.js
• backend/utils/streakTracker.js

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The streak tracker now includes the 14-day achievement milestone. A new Vitest suite tests milestone unlocking, duplicate prevention, UTC day differences, and streak resets after missed practice.

Changes

Streak milestone coverage

Layer / File(s)	Summary
14-day milestone and streak behavior tests backend/utils/streakTracker.js, backend/tests/streakTracker.unit.test.js	The tracker adds the 14-Day Streak milestone. Tests cover 3-, 7-, 14-, and 30-day achievements, duplicate prevention, UTC day differences, and missed-practice resets.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 9a57a

This change enables the existing 14-day streak achievement while preserving the other streak milestones and adds targeted test coverage. No actionable merge-blocking risk remains beyond normal checks and review.

Suggested reviewers: torqued-codes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding the missing 14-day streak milestone.
Linked Issues check	✅ Passed	The pull request adds the 14-day milestone to restore the required 3 → 7 → 14 → 30 progression and adds unit tests for the milestone and existing streak behavior. This satisfies issue #2290.
Out of Scope Changes check	✅ Passed	The changes are limited to the streak milestone configuration and related unit tests. No unrelated changes are present.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2 files.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

Warning

Some tools did not complete. Review the errors below.

🔧 Biome (2.5.7)

backend/tests/streakTracker.unit.test.js

File contains syntax errors that prevent linting: Line 1: Illegal use of an import declaration outside of a module

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