### What?
Updated the `selectionToUse` export field to properly render a radio
group with dynamic options based on current selection state and applied
filters.
- Fixed an edge case where `currentFilters` would appear as an option
even when the `where` clause was empty (e.g. `{ or: [] }`).
### Why?
Previously, the `selectionToUse` field displayed all options (current
selection, current filters, all documents) regardless of context. This
caused confusion when only one of them was applicable.
### How?
- Added a custom field component that dynamically computes available
options based on:
- Current filters from `useListQuery`
- Selection state from `useSelection`
- Injected the dynamic `field` prop into `RadioGroupField` to enable
rendering.
- Ensured the `where` field updates automatically in sync with the
selected radio.
- Added `isWhereEmpty` utility to avoid showing `currentFilters` when
`query.where` contains no meaningful conditions (e.g. `{ or: [] }`).
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