Function prepareReachableRangesForDisplay

prepareReachableRangesForDisplay(
    result: PolygonFeatures,
    theme?: GeometryTheme,
    label?: ReachableRangeLabelFn,
): PolygonFeatures
Prepares the output of calculateReachableRanges for display with GeometriesModule.

Derives labels from each feature's budget property by default, applies theme-specific geometry, and preserves the bounding box. Pass the returned value directly to module.show().

Note: when using reachableRangeGeometryConfig this is called automatically — you only need this function for explicit control over labels or theme.

Features must be ordered largest budget first (e.g. 30 min, 20 min, 10 min).
Parameters
- result: PolygonFeatures
  Raw output of calculateReachableRanges.
- theme: GeometryTheme = 'filled'
  Visual theme. Defaults to 'filled'.
- Optionallabel: ReachableRangeLabelFn
  Custom label generator; when omitted, labels derived from budget property.
Returns PolygonFeatures
Example
```
// explicit control:
module.show(prepareReachableRangesForDisplay(result, 'inverted'));
module.show(prepareReachableRangesForDisplay(result, 'filled', (f) => myLabel(f)));
```