feat(spx-gui): add custom formatter and parser to number inputs for handling special direction names

[Overu]

Closed #2428

[gemini-code-assist[bot]]

Summary of Changes

Hello @Overu, I'm Gemini Code Assist[^1]! 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 introduces a significant improvement to user experience by enabling number input fields, specifically those controlling direction, to understand and display descriptive direction names alongside traditional numerical values. This is achieved by extending the core UINumberInput component with custom formatting and parsing capabilities, making the interface more intuitive and user-friendly for setting directions.

Highlights

• Enhanced Number Input: The UINumberInput component now supports custom formatter and parser functions, allowing for flexible input and display of values beyond simple numbers.
• Special Direction Names: Direction input fields (e.g., SpxDirectionInput and SpriteDirection) can now interpret and display special direction names (like 'up', 'down', 'left', 'right') in addition to numerical degree values.
• New Utility Function: A new utility function, valueForSpxDirection, has been added to convert string-based direction names into their corresponding numerical degree values.

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Code Review Summary

The implementation is clean and follows Vue 3 best practices. Three noteworthy issues identified:

🔴 Security: Parser functions should validate Number() output to prevent NaN/Infinity propagation (see inline comments)

🟡 Code Quality: Formatter/parser logic is duplicated across components - consider extracting to shared utilities

🟡 Documentation: Utility functions lack JSDoc explaining behavior and usage

Overall solid work! The performance characteristics are good, and the architecture integrates well with existing patterns.