Refactor/utsav travel credits

[vvshk]

1. utsav credits functionality added
2. available seat count discrepency resolved
3. change utsav booking status update from a page to modal

[gemini-code-assist]

Summary of Changes

Hello @vvshk, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the administrative interface for Utsav bookings. It introduces a new feature for managing credits during booking cancellations and streamlines the booking status update process by converting it into a modal. Additionally, it includes general code cleanup, improves data presentation in summaries, and adds user experience improvements like state persistence for filters and scroll position.

Highlights

• Utsav Credits Functionality: Introduced the ability to issue credits when an Utsav booking status is changed to 'Admin Cancelled' via a new dropdown in the status update modal.
• Booking Status Update Modal: The Utsav booking status update process has been migrated from a separate page to an interactive modal, improving user experience and workflow.
• Code Refactoring and Cleanup: Significant refactoring in utsavBookingslist.js for improved readability and maintainability, including more concise function definitions and event listener bindings. A large block of commented-out code was also removed from fetchBookingsForDriver.js.
• Enhanced Center-wise Summary: The center-wise summary modal now provides a more detailed breakdown, including total registrations, and counts for males and females per center.
• State Persistence: Implemented session storage to remember the user's selected package filter and scroll position, providing a more seamless browsing experience.

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[gemini-code-assist]

Code Review

This pull request introduces Utsav credits functionality, resolves a seat count discrepancy, and refactors the booking status update to use a modal. The code, particularly in utsavBookingslist.js, has been significantly condensed, which in some cases has reduced readability and maintainability. My review includes suggestions to improve code clarity, efficiency, and robustness by optimizing loops, restoring lost functionality like date padding and sorting, and adhering to JavaScript best practices. I've also pointed out some formatting issues in the HTML that affect readability.