Typing in the map search pill now opens a suggestions dropdown built
from the items that already match the active filters:
- Spots: title matches; selecting one flies to it and opens its sheet.
- Places: distinct city/region/country tokens split out of each item's
location; selecting one sets the query to that token (e.g. spain ->
Spain).
buildSearchSuggestions lives in lib (pure, testable) and
MapSearchSuggestions.tsx is presentational; MapPage owns the list and
keyboard nav (ArrowUp/Down, Enter, Escape). Adds mapPage.searchSuggestPlaces
(en/es only; other locales fall back to English).
