fix: support string in Grid cells and store gridIndex on items

[MinCrohn]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @MinCrohn, 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 flexibility and data accessibility of the grid display system. It introduces the ability for grid cells to accept string values, which are then dynamically applied as labels to the corresponding grid items. Crucially, each grid item will now carry its precise gridIndex (row and column) within its attributes, simplifying positional logic. The underlying item management within the Cellsable mixin has been optimized for performance and clarity, alongside a small but impactful refinement in the base component mixin to ensure more robust property application.

Highlights

• Grid Cell String Support: Grid cells can now accept string values, which are then used as labels for the generated grid items, enhancing their descriptive capabilities.
• Grid Index Storage: The gridIndex (row and column position) is now explicitly stored within the attrs property of each grid item, providing direct access to its location.
• Improved Grid Item Management: The Cellsable mixin has been refactored for more efficient grid item creation and updates, utilizing a Map for child lookup and updating existing items with new labels rather than recreating them.
• Robust Property Application: A minor but important fix in the Base mixin ensures that properties like id, label, and attrs are applied only when they are explicitly present in the validatedChanges object, preventing unintended behavior with falsy values.

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[gemini-code-assist]

Code Review

This pull request introduces significant enhancements to the grid component's functionality. The gridSchema in element-schema.js has been updated to allow grid cells to accept string values in addition to the existing 0 and 1, enabling more descriptive cell content. Correspondingly, the Cellsable mixin in Cellsable.js was refactored to support this change, now creating or updating grid items based on these string labels and adding a gridIndex attribute to new items. Additionally, a minor refactoring in Base.js improves the handling of id, label, and attrs when applying changes, ensuring these properties are only destructured and applied if they are present in the validatedChanges object.