Function resolvePointerSelectionAction

resolvePointerSelectionAction(
e: AcEdSelectionModifierState,
): AcEdSelectionAction
Resolves the default action for direct pointer-based selection in the 2D viewer.

Unlike the generic resolver, pointer selection without modifiers defaults to 'add' so repeated clicks or drag selections preserve the existing selection set instead of replacing it.

Modifier precedence remains the same as resolveSelectionActionFromEvent: Shift removes, while Ctrl/Meta adds.
Parameters
- e: AcEdSelectionModifierState
  Modifier-key state captured from the pointer event.
Returns AcEdSelectionAction
The selection action that should be used for pointer selection.
Example
```
resolvePointerSelectionAction({
  shiftKey: false,
  ctrlKey: false,
  metaKey: false
})
// => 'add'
```
- Defined in packages/cad-simple-viewer/src/editor/view/AcEdSelectionAction.ts:119