feat([2fd88f42]): add adjustable marker radius and collapse filters by default

heatmap-tool/frontend/src/components/FilterPanel.tsx

@@ -60,7 +60,7 @@ const FilterPanel: React.FC<FilterPanelProps> = ({ filters, onFilterChange, isLo
       <div className="filter-panel">
         <h3>Filters</h3>
         {Object.entries(filters).map(([category, options]) => (
-          <details key={category} className="filter-group" open>
+          <details key={category} className="filter-group">
             <summary>{category}</summary>
             <div className="filter-options">
               {options.map(option => (

heatmap-tool/frontend/src/components/MapDisplay.tsx

@@ -6,23 +6,26 @@ import type { HeatmapPoint } from '../App';
 
 interface MapDisplayProps {
   heatmapData: HeatmapPoint[];
+  radiusMultiplier: number;
 }
 
-const MapDisplay: React.FC<MapDisplayProps> = ({ heatmapData }) => {
+const MapDisplay: React.FC<MapDisplayProps> = ({ heatmapData, radiusMultiplier }) => {
   const germanyCenter: [number, number] = [51.1657, 10.4515];
 
-  // Simple scaling function for marker radius
+  // Simple scaling function for marker radius, now with a multiplier
   const calculateRadius = (count: number) => {
-    return 5 + Math.log(count + 1) * 5;
+    // Ensure a base radius so even single points are visible
+    // The multiplier is applied to the dynamic part of the radius
+    return 3 + Math.log(count + 1) * 5 * radiusMultiplier;
   };
   
   // Simple color scaling function
   const getColor = (count: number, maxCount: number) => {
     const ratio = count / maxCount;
-    if (ratio > 0.8) return 'red';
-    if (ratio > 0.5) return 'orange';
-    if (ratio > 0.2) return 'yellow';
-    return 'green';
+    if (ratio > 0.8) return '#d73027'; // Red
+    if (ratio > 0.5) return '#fdae61'; // Orange
+    if (ratio > 0.2) return '#fee08b'; // Yellow
+    return '#66bd63'; // Green
   }
 
   const maxCount = Math.max(...heatmapData.map(p => p.count), 1);