fix: disable all map options by default except clustered markers

- Set showEvents to false by default
- Set showWaterQuality to false by default
- Set showHeatmap to false by default (already was)
- Set showHotspots to false by default (already was)
- Keep showClusters as true (only enabled option)

Users can now enable features as needed via map filters

src/components/map/MapView.tsx

@@ -54,7 +54,7 @@ export function MapView({
   showClusters = true,
   showHeatmap = false,
   showHotspots = false,
-  showWaterQuality = true,
+  showWaterQuality = false,
   center = [53.4, -9.0], // Centered on Ireland, minimizing UK visibility
   zoom = 7,
 }: MapViewProps) {