refactor: remove hardcoded data window strings in dashboard components

[Sarthak-Nayak]

Description

Refactored multiple dashboard metrics components to eliminate hardcoded date window text strings (e.g., "Last 90d", "Last 30d"). These UI labels are now dynamically generated using array mapping and template literals derived directly from their respective tracking constants and state variables. This ensures the UI remains synced and robust against future date window configuration changes.

Changes Made

• Updated dropdown options in CommitTimeChart.tsx, ActivityRingChart.tsx, and other dashboard cards to dynamically map over day values.
• Updated internal component definitions in page.tsx to utilize a unified data window constant for public metrics visibility.

Closes

Closes #956

[vercel]

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[github-actions]

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