feat(spx-gui): make asset library banner dynamic based on asset type

[Overu]

Updates #2729

Fix issues related to AssetLibraryModal

[gemini-code-assist]

Summary of Changes

Hello @Overu, 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 enhances the user experience within the asset library modal by introducing dynamic banners that adapt to the asset type being viewed. Furthermore, it integrates an intelligent suggestion system that encourages users to leverage AI for asset generation when the existing library doesn't meet their immediate needs, streamlining the asset discovery and creation workflow.

Highlights

• Dynamic Asset Library Banners: The asset library modal now features dynamic banners that change based on the selected asset type (Sprite, Backdrop, Sound), providing a more tailored visual experience.
• AI Asset Generation Suggestion: A new AI asset generation suggestion feature has been implemented. It prompts users to generate assets using AI when search results are sparse or when they reach the end of the asset list without finding suitable options.
• UI/UX Improvements: The modal's layout and scrolling behavior have been refined, including wrapping the header in a scroller, adjusting empty state margins, and integrating the new AI generation suggestion UI elements.

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[gemini-code-assist]

Code Review

This pull request introduces a dynamic banner for the asset library, changing based on the asset type. It also adds a new feature to suggest AI asset generation when search results are sparse or at the end of the list. The implementation is solid, with good use of Vue's computed properties for dynamic behavior. I have one minor suggestion to improve code maintainability by replacing a magic number with a named constant. Overall, these changes enhance the user experience and the codebase.

[xgopilot]

Code Review Summary

This PR successfully adds dynamic banner support based on asset type with clean implementation. Overall code quality is good with proper use of Vue composition patterns.

Key findings:

• ✅ No security vulnerabilities
• ✅ Minimal performance impact (~51KB bundle increase)
• ⚠️ Two code style issues violating project standards (magic number, nested ternary)

The implementation follows established patterns well. Addressing the inline comments will improve maintainability and standards compliance.