ALL-965/967/969: Relay org picker bug bundle (popover collapse, acronym, dedup, X icon)

3 related P1 sales-blocker bugs in the Relay org picker combobox. Bundling into one PR since they share the same component (search popover + dropdown renderer). Morgan re-dispatched from 2026-05-19 Relay sales-QA walkthrough. - ALL-965: popover collapse on 2nd keystroke + acronym aliasing (e.g. NHEC -> New Hampshire Electric Cooperative) - ALL-967: duplicate Adams Electric Cooperative entries need disambiguation (state/city) - ALL-969: per-option X icon — remove or relabel