Add optional nearby-supplier cluster sort mode to the collection pool table, keeping operational sort as the default. Also includes:
- Update UserSearch component to support fallback selected label for pre-selected values
- Refactor AssignDriverDialog into a separate inner component with intent and pre-filled driver label support
- Add assignment badge helper types and functions
- Add full test coverage for new sort logic and component behaviors
- Update implementation plans and documentation files
- Fix minor code consistency and lint issues across touched files
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