GIScience/ohsome-now-stats-frontend ? reverse-engineered prompt

Build me an Angular web app for ohsomeNow stats that shows up to date OpenStreetMap mapping activity in a clean dashboard.

I want users to be able to pick a time range and an optional OSM changeset hashtag filter, then see a quick overview with contributor counts, total edits, added buildings, and added road length. Add a trending hashtags view, a timeline chart for mapping activity over time, and a world map that highlights the country or area covered by a campaign. If it fits, also include a hex map view for a more detailed spatial breakdown.

Make it feel like a polished stats site, easy to scan, with a modern admin dashboard style. Use the API data in near real time, and make the page responsive so it works well on desktop and mobile. Include sensible loading and error states, and basic tests where they make sense. If you need current Angular docs or best practices, look them up online.