Fix NodeLocationMap height and always show center dot

- Pass fullHeight to NodeLocationMap in NodeDetail so it fills the
  h-[400px] wrapper rather than rendering its own h-[300px] and
  leaving dead space below
- Always show the center dot in NodeLocationMap: the previous threshold
  (accuracyMeters < 100) suppressed the dot for typical Meshtastic
  precision values (10-13 bits → 2-10km accuracy), making the map
  appear empty even when a location was known

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/src/components/dashboard/GoogleMap.tsx

@@ -30,7 +30,7 @@ export const NodeLocationMap: React.FC<NodeLocationMapProps> = ({
 }) => {
   const accuracyMeters = calculateAccuracyFromPrecisionBits(precisionBits);
   const effectiveZoom = zoom ?? calculateZoomFromAccuracy(accuracyMeters);
-  const showCenterDot = precisionBits === undefined || accuracyMeters < 100;
+  const showCenterDot = true;
 
   const markerGeoJSON = useMemo((): FeatureCollection => ({
     type: "FeatureCollection",

web/src/components/dashboard/NodeDetail.tsx

@@ -589,6 +589,7 @@ export const NodeDetail: React.FC<NodeDetailProps> = ({ nodeId }) => {
               lat={latitude}
               lng={longitude}
               precisionBits={precisionBits}
+              fullHeight
             />
           </div>
           <NodePositionData