Add holdBestAvailable types and callbacks

[bverbeken]

Summary

• Add BestAvailableForHoldingConfig and BestAvailableHeldResult types
• Add onBestAvailableHeld and onBestAvailableHoldFailed callbacks to ChartRendererCallbacks
• Add holdBestAvailable method to SeatingChart interface

Test plan

• yarn build passes
• yarn test passes

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR updates the public TypeScript typings for the embedded seating chart to support “best available” holding via new config/result types, new renderer callbacks, and a new SeatingChart method, and also adds a new accessibility-related property on selectable objects.

Changes:

• Add BestAvailableForHoldingConfig and BestAvailableHeldResult types plus holdBestAvailable(...) on SeatingChart.
• Add onBestAvailableHeld and onBestAvailableHoldFailed to ChartRendererCallbacks.
• Add WheelchairSpaceType and wheelchairSpaceType on AbstractSelectableObject (plus typing coverage in the test file).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
src/index.ts	Extends the public API typings with best-available holding types/callbacks/method and adds wheelchair-space typing on selectable objects.
src/index.test.ts	Updates the “full config” typing test to include the new callbacks and references the new wheelchairSpaceType field.

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