Split the News panel into Conflicts and Local

Conflicts is the hotspots' significant news, on the map whenever the layer is
on. Local lists every report within 500 km of the view centre below 3,000 km,
and the map shows those instead while it is chosen. The section replaces the
"Include minor news" and "Show event cards" toggles: picture cards are always
on, and Local is what reads minor news. The Conflicts feed reads the same
whichever section is shown.

changelog.d/1-news-layer.md

@@ -2,7 +2,8 @@
   24 hours from curated hotspots (or the fewer hours a server names), narrowed
   in the panel to the last 12, 6, 3 or 1 hours with the hotspot counts read for
   that window, coloured by severity only, with hotspot
-  beacons, outlines with disputed areas, picture cards for major events, an
-  "In view" list below 3,000 km and a continuous feed whose cards fly the globe
-  to the event. Core serves no news itself: set `GEV_NEWS_ORIGIN` to a news
+  beacons, outlines with disputed areas, picture cards for major events and a
+  continuous feed whose cards fly the globe to the event. The panel's Local
+  section lists every report within 500 km of the view below 3,000 km, and the
+  map shows those instead of the hotspots' news while it is chosen. Core serves no news itself: set `GEV_NEWS_ORIGIN` to a news
   server and the local server forwards the layer's three read routes there.