Widen the side panels so the hourly forecast strip fits

260px -> 300px on the shared .basemap-panel class (Overlays/GPX/Livetrack
all use it) — the next-8-hours row was getting clipped.

public/css/style.css

@@ -290,7 +290,7 @@ html, body {
   position: fixed;
   top: 0;
   left: 52px;
-  width: 260px;
+  width: 300px;
   max-width: 90vw;
   height: 100%;
   display: flex;