feat: make tile loading indicator more explicit

[igorDykhta]

• make tile loading indicator more explicit

[Copilot]

Pull request overview

Adds a more explicit map tile loading indicator by tracking vector tile loads (in addition to existing raster tracking) and enhancing the UI presentation in the components package.

Changes:

• Introduce a global counter for “vector tiles being loaded” and export a getter via @kepler.gl/layers.
• Increment/decrement the vector tile counter around getTileData in the custom MVTLayer.
• Update the LoadingIndicator UI to show raster/vector counts and add a spinner + new styling.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.

File	Description
src/layers/src/vector-tile/vector-tile-layer.ts	Adds global vector tile loading counter utilities and exports getter.
src/layers/src/vector-tile/mvt-layer.ts	Wraps getTileData to track vector tile load progress.
src/layers/src/index.ts	Re-exports getNumVectorTilesBeingLoaded from layers entrypoint.
src/components/src/loading-indicator.tsx	Enhances loading indicator styling and displays raster/vector tile loading counts.

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