Refactor frontend components and cleanup

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

frontend/src/components/EntityInvestigationView.tsx

@@ -3,6 +3,7 @@ import { useEffect, useState } from 'react';
 import { InfoTip } from './ui/Tooltip';
 import { TIPS } from './ui/tooltips';
 import { formatDateOnly } from '../utils/dateUtils';
+import { getCountryFlag } from '../utils/countryUtils';
 
 interface EntityStats {
   entity_type: string;
@@ -84,15 +85,7 @@ export function EntityInvestigationView() {
     return labels[entityType] || entityType;
   };
 
-  const getCountryFlag = (code: string) => {
-    const flags: Record<string, string> = {
-      CN: '🇨🇳', US: '🇺🇸', FR: '🇫🇷', DE: '🇩🇪', GB: '🇬🇧',
-      RU: '🇷🇺', CA: '🇨🇦', AU: '🇦🇺', JP: '🇯🇵', IN: '🇮🇳',
-      BR: '🇧🇷', IT: '🇮🇹', ES: '🇪🇸', NL: '🇳🇱', BE: '🇧🇪',
-      CH: '🇨🇭', SE: '🇸🇪', NO: '🇳🇴', DK: '🇩🇰', FI: '🇫🇮'
-    };
-    return flags[code] || code;
-  };
+  ;
 
 
   if (loading) {