Add a next-8-hours strip to the Radar panel's forecast

Same Open-Meteo call and cache as the daily outlook, just with an hourly
field added — a rolling window from now rather than "rest of today", so
it doesn't shrink to nothing right before midnight.

public/css/style.css

@@ -218,6 +218,29 @@ html, body {
   border-top: 1px solid #eee;
 }
 
+.radar-control__forecast-hours {
+  display: flex;
+  gap: 10px;
+  overflow-x: auto;
+  padding-bottom: 6px;
+  margin-bottom: 4px;
+  border-bottom: 1px solid #eee;
+}
+
+.radar-control__forecast-hour {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 2px;
+  flex: 0 0 auto;
+  font-variant-numeric: tabular-nums;
+}
+
+.radar-control__forecast-hour span:first-child {
+  color: #888;
+  font-size: 11px;
+}
+
 .radar-control__forecast-day {
   display: flex;
   align-items: center;