Description Widen src/types/weather.ts to include region, population, a daily forecast shape, and optional gust/UV/precipitation/pressure fields. Add src/data/cities.ts with ~10 popular Norwegian places, each with real lat/lon, region, and population. Rationale Population is needed to size map markers later, and region/lat/lon are needed by both the map and the forecast fetch. Getting this typed and populated first means every later issue (map, list, forecast panel) can build against a stable shape instead of guessing at it individually.