refactor: use backend streak data for HOT_STREAK badge evaluation

[Yashaswini-K-P]

Description

Refactored the HOT_STREAK badge evaluation logic in frontend/js/user/badges.js to utilize the backend's precalculated streak data (data.streak.current) instead of manually traversing and recalculating streaks on the client-side history array, reducing code duplication and edge-case handling.

Linked Issue

Fixes #360

Changes Made

• Removed the manual client-side history iteration loop used for calculating HOT_STREAK.
• Implemented a clean check if (data.streak && data.streak.current >= 7) to award the HOT_STREAK badge.
• Cleaned up trailing array comma syntax in ALL_BADGES.

Type of Change

• Bug fix
• New feature
• UI/Visual update
• Documentation update
• Refactor

Testing

• Tested locally
• Tested on mobile viewport (if applicable)
• No console errors introduced

Checklist

• My code follows the project's coding style
• I have formatted my code locally by running npx prettier --write . before submitting
• I am submitting my PR from a dedicated feature/* branch, not the main branch
• I have performed a self-review of my code
• My changes generate no new warnings or errors
• I have updated documentation if required
• I have linked the relevant issue

Screenshots / Screen Recording

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