Dropdown was opening automatically on render and not closing when clicking
elsewhere. Now opens only on focus/click, closes on blur, selection, Enter,
Escape, and Tab. Selected value persists in the input after selection.
RESPONSIBLE_TEAM, EQUIP_STATUS, and EQUIPMENT_CLASS now show searchable
dropdown selectors in both the Bulk Defaults section and per-row inline
editing. Type to filter options, use arrow keys to navigate, Enter to select.
Picklist values extracted from docs/Team_Device Loader.xlsx reference sheets.
Per-row cells remain click-to-edit for all columns — picklist columns show
the SearchableSelect, free-text columns show a plain input.
