Show news from the window the server serves

A host may serve fewer hours than the day. The hotspots answer may name its window
(`windowHours`, a whole number from 1 to 24); the layer keeps reports, the
feed, In view and the chosen event inside it, and the panel says
"Last 12 h" or "Last 24 h" accordingly. Without a window named, or with one
out of range, the layer keeps the full day as before.

changelog.d/1-news-layer.md

@@ -1,5 +1,6 @@
 - Add the News layer (Events ▸ News) and its right-rail NEWS panel: the last
-  24 hours from curated hotspots, coloured by severity only, with hotspot
+  24 hours from curated hotspots (or the fewer hours a server names, shown in
+  the panel), 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