fix: onRemove does not clear internal state

[wazolab]

Severity

P2 — Memory leak / stale state

Description

In `src/teritorio-cluster.ts:123-133`, `onRemove` removes markers and event listeners but does not reset internal state:

• `this.markersOnScreen` — still populated after removal
• `this.clusterLeaves` — retains stale cluster data
• `this.featuresMap` — retains stale feature data
• `this.selectedFeatureId` — still references a feature
• `this.map` — still references the map instance
• `this.source` — still references the source

If the instance is held by consumer code after layer removal, these references prevent garbage collection of the map, source, and all DOM elements referenced by features.

Suggested Fix

Add state cleanup at the end of `onRemove`:
```ts
this.markersOnScreen.clear()
this.clusterLeaves.clear()
this.featuresMap.clear()
this.selectedFeatureId = null
this.map = null
this.source = null
```

Files

• `src/teritorio-cluster.ts:123-133`