refactor: replace hardcoded data window labels

[Yash-Chhipa]

Summary

Closes #956

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Type of Change

• Bug fix
• New feature
• Documentation update
• Refactor / code cleanup

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Changes Made

• Replaced hardcoded "90 days" and "30 days" labels with dynamic labels derived from DATA_WINDOW_DAYS.
• Updated LocalCodingTime component.
• Updated RepoActivityDrawer component.
• Updated StreakTracker component.

Verification

• Audited dashboard components for hardcoded data window labels.
• Replaced labels with references to constants.
• Ran lint successfully (existing warnings only).

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Checklist

• Linked issue in summary
• npm run lint passes locally
• No TypeScript errors (npm run type-check)
• Self-reviewed the diff
• Added/updated tests if applicable

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