feat: add configurable time window selection for stories

[idan]

Implement configurable time window filtering for story queries, allowing users to select between multiple time periods.

Changes

• Added TIME_WINDOWS constant defining available time periods (2 weeks, 1 month, 3 months, 6 months)
• Added timeWindow state to App component with default of 90 days
• Modified fetch logic to use dynamic timeWindow instead of hardcoded 3-month period
• Updated useEffect dependency array to include timeWindow, triggering refetch when selection changes
• Enhanced header UI with flex layout and dropdown select component for time window selection
• Updated subtitle to dynamically display the selected time window label
• Removed inline comments for cleaner code
• Updated bun.lock with configVersion 0

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