fix: fix formatNumber accuracy

[fatelei]

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Summary

fix #30869

fix formatNumber accuracy

Screenshots

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Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint and make type-check (backend) and cd web && npx lint-staged (frontend) to appease the lint gods

[gemini-code-assist]

Summary of Changes

Hello @fatelei, 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 refines the formatNumber utility to ensure that very small numerical values are presented with full decimal precision rather than in scientific notation. This enhancement improves readability and accuracy for users interacting with small data points, ensuring a more intuitive display of numerical information across the application.

Highlights

• Enhanced Number Formatting: The formatNumber utility function has been improved to prevent the display of very small numbers in scientific notation, ensuring they are shown with full decimal precision for better readability.
• Dynamic Precision Calculation: New logic has been introduced within formatNumber to dynamically determine the appropriate decimal precision required to accurately represent small numbers, whether they originate from standard decimal or scientific notation inputs.
• Comprehensive Test Coverage: Extensive unit tests have been added to validate the new formatting behavior, covering various scenarios including very small positive and negative numbers, as well as string inputs that might contain scientific notation.

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[gemini-code-assist]

Code Review

This pull request aims to fix an accuracy issue in formatNumber for very small numbers. The approach is good, and the added tests are a great start. However, I've found a subtle bug in the new logic where numbers with multi-digit mantissas in scientific notation (e.g., 1.23e-7) would lose precision. I've provided a comment with a suggested fix for the implementation that also refactors the code to be more maintainable. I've also suggested an additional test case to cover this scenario and prevent future regressions. Overall, a good fix that will be even better with these adjustments.