feat: add sprint-to-sprint comparison analytics (NSOC'26)

[SrashtiChauhan]

Description

This PR introduces sprint-to-sprint comparison functionality in the Insights → Analytics section.
Previously, analytics data could only be viewed for a single sprint at a time. This enhancement allows users to compare two sprint periods side by side, making it easier to evaluate performance changes across development cycles.

Changes Made

Sprint Comparison Support

• Added dual sprint selectors for comparison
• Introduced Sprint A and Sprint B state management
• Enabled dynamic switching between sprint datasets

Comparison Metrics

Added a new Sprint Comparison section displaying:

• Completed Tasks comparison
• Review Activity comparison
• Difference between selected sprints

Dynamic Updates

• Metrics update automatically when sprint selections change
• Supports all available sprint datasets
• Preserves existing analytics functionality

Benefits

• Provides historical sprint context
• Helps teams identify performance improvements or regressions
• Creates a foundation for future analytics enhancements
• Improves visibility into sprint progress over time

Tech Stack

• Next.js
• React
• TypeScript
• Tailwind CSS

Screenshot

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Closes #128

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[github-actions]

👋 Thank you for opening this pull request! I will review your changes and assist you soon.

[SrashtiChauhan]

hi @Shriii19 ,
Kindly review my pr

[SrashtiChauhan]

hi @Shriii19 , Kindly review my pr

@Shriii19

[vercel]

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Project	Deployment	Actions	Updated (UTC)
flow-forge	Ready	Preview, Comment	May 31, 2026 4:09pm