Make mapId optional in DeckGlContextProvider

[Copilot]

DeckGlContextProvider required mapId as a mandatory prop, forcing explicit map identification even in single-map setups where a default map is available.

Changes

• packages/deck-gl/src/contexts/DeckGlContext.tsx: Changed mapId: string → mapId?: string in DeckGlContextProviderProps

When mapId is omitted, useMap already falls back to the default registered map instance — consistent with the existing pattern across other hooks (useAddImage, useFitLayerBounds, etc.).

Usage

// Before: mapId was always required
<DeckGlContextProvider mapId="main-map">
  <App />
</DeckGlContextProvider>

// After: mapId is optional; omitting it uses the default map
<DeckGlContextProvider>
  <App />
</DeckGlContextProvider>

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