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
Remove redundant Assign Drivers top-level navigation link since driver assignment is now embedded directly in the collection pool page per-row, and add an Other nav section for leftover navigation items
Extract collection pool view logic into a dedicated view-model module with full Vitest test coverage for assignment state classification, row sorting, pool age labeling, and proximity marker grouping
Flatten the collection pool page into a single unified list replacing the old grouped assigned/unassigned layout, with updated row UI showing all required operational details and context-aware actions
Add database migration to add optional `collection_photo` field to order_items for driver pickup proof photos
Add complete design documentation, planning artifacts, and brainstorming session files for the collection pool redesign project
