This child bounty is for OpenSquare's retroactive work to migrate [statescan v1](https://github.com/opensquare-network/statescan) to [v2](https://github.com/opensquare-network/statescan-v2). The work includes:

1. Abandon next.js and SSO, and rewrite the fronted code with react. We redesigned most UI components and implemented dark mode. The new code is also more friendly and modularized to support common substrate chains.
2. We rewrite most scan scripts for uniques/assets pallet, and improve the logic toe scan on-chain accounts.
3. NFT parsing scripts are refactored into [several modules](https://github.com/opensquare-network/statescan-v2/tree/main/backend/packages/uniques-scan/src/scripts), so it will become easier to fetch and parse thousands of NFT resources including images and videos.
4. Create a common package to extract code handling with mongodb.
5. Extract calls from extrinsics and show them in separated list and detail pages.

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- **Problem Statement:** OpenSquare needs to migrate statescan v1 to v2 by abandoning next.js and SSO, rewriting front-end code with react, and improving scan scripts for better functionality.
- **Significance:** Enhancing UI components, implementing dark mode, and improving NFT parsing scripts will streamline data extraction and processing for thousands of NFT resources.
- **Proposed Solution:** Rewrite front-end code with react, improve scan scripts, refactor NFT parsing scripts, create a common package for mongodb, and extract calls from extrinsics for better organization.
- **Expected Outcomes:** Improved user experience, enhanced data extraction capabilities, and better support for common substrate chains.

Requested: 0.60 undefined

#520 Retroactive work for statescan v2