Enhance portfolio insights and document exchange setup

[dawei41468]

Summary

• derive portfolio totals, weighted change, and best/worst performers from the mock asset data
• centralise shared currency/percentage helpers so cards render consistent values
• document the exchange and wallet setup workflow and add an ignore list for local artifacts

Testing

• not run (Next.js lint setup prompts for interactive configuration)

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https://chatgpt.com/codex/tasks/task_e_68d381dcf618832388264dc56689c931

[gemini-code-assist]

Summary of Changes

Hello @dawei41468, 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 significantly upgrades the portfolio dashboard by introducing advanced analytical capabilities, such as weighted change, identification of best and worst performing assets, and a detailed asset allocation breakdown. It also improves code consistency by centralizing currency and percentage formatting utilities. Furthermore, it provides essential documentation for integrating various cryptocurrency exchanges and wallets, ensuring a smoother setup process for real data, and updates the .gitignore to prevent common development files from being tracked.

Highlights

• Enhanced Portfolio Insights: The pull request introduces calculations for portfolio totals, weighted change, best/worst performing assets, and asset allocation, derived from mock asset data.
• Centralized Formatting Utilities: Shared currency and percentage helper functions have been centralized in lib/utils.js to ensure consistent value rendering across different components like AssetList, ExchangeCard, and PortfolioOverview.
• Integration Documentation: A new comprehensive guide (docs/integration-guide.md) has been added, detailing the setup workflow for various exchanges (Binance, Coinbase, Kraken) and wallets (MetaMask), along with an updated .gitignore to manage local development artifacts.

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[gemini-code-assist]

Code Review

This pull request significantly improves the codebase by centralizing portfolio calculation logic and adding clear documentation for data source integration. The refactoring of helper functions into lib/utils.js eliminates code duplication and enhances maintainability. The new calculatePortfolioStats function is well-implemented, robustly handling various scenarios. The addition of integration-guide.md is a thoughtful touch that will greatly help developers connect real data. My feedback includes a couple of minor suggestions for code simplification and documentation formatting.

[gemini-code-assist]

The use of Math.round() here is unnecessary. The working array is created using Math.floor() on the percentages, which means item.percentage is always an integer. Consequently, the result of the reduce() operation is an integer, and subtracting it from 100 also yields an integer. Removing the redundant Math.round() call will make the code slightly cleaner.

  let remainder = 100 - working.reduce((sum, item) => sum + item.percentage, 0);

[gemini-code-assist]

To improve readability and enable syntax highlighting for this code block, it's best practice to specify the language in Markdown. Adding bash is appropriate for this list of environment variables.

Suggested change

	```
	```bash