fix: replace emoji flags with text badges, clean city names from postal codes

Emoji flags render as boxes on Linux. Replace with a small FR/BE/CH
badge. Also strip postal codes from Cesium+ city names (e.g.
"Saint-Jean-de-Laur, 46260" → "Saint-Jean-de-Laur").

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

src/components/StatsPanel.tsx

@@ -1,6 +1,5 @@
 import { useRef } from 'react';
 import type { PeriodStats } from '../services/DataService';
-import { countryCodeToFlag } from '../services/adapters/CesiumAdapter';
 
 interface StatsPanelProps {
   stats: PeriodStats | null;
@@ -121,8 +120,13 @@ export function StatsPanel({ stats, loading, periodDays, source }: StatsPanelPro
             >
               <span className="text-base">{MEDALS[i]}</span>
               <div className="flex-1 min-w-0">
-                <p className="text-white text-sm font-medium truncate">
-                  {countryCodeToFlag(city.countryCode)}{city.countryCode ? ' ' : ''}{city.name}
+                <p className="text-white text-sm font-medium truncate flex items-center gap-1.5">
+                  {city.countryCode && (
+                    <span className="shrink-0 text-[10px] font-bold bg-[#1e1f2a] text-[#6b7280] rounded px-1 py-0.5 leading-none">
+                      {city.countryCode}
+                    </span>
+                  )}
+                  {city.name}
                 </p>
                 <p className="text-[#6b7280] text-xs">{city.count} tx</p>
               </div>

src/services/adapters/CesiumAdapter.ts

@@ -50,12 +50,9 @@ function latLngToCountryCode(lat: number, lng: number): string {
   return '';
 }
 
-/** Convertit un code ISO 3166-1 alpha-2 en emoji drapeau */
-export function countryCodeToFlag(code: string): string {
-  if (!code || code.length !== 2) return '';
-  return String.fromCodePoint(
-    ...code.toUpperCase().split('').map((c) => 0x1F1E0 - 65 + c.charCodeAt(0))
-  );
+/** Nettoie le nom de ville Cesium+ : retire le code postal ("Paris, 75001" → "Paris") */
+export function cleanCityName(city: string): string {
+  return city.split(',')[0].trim();
 }
 
 // geoPoint accepte n'importe quel type — Cesium+ utilise plusieurs formats ES geo_point
@@ -132,7 +129,7 @@ export async function resolveGeoByKeys(
     if (!geo) continue;
     result.set(hit._id, {
       name:        src.title ?? '',
-      city:        src.city ?? 'Inconnue',
+      city:        cleanCityName(src.city ?? 'Inconnue'),
       countryCode: latLngToCountryCode(geo.lat, geo.lng),
       lat:         geo.lat,
       lng:         geo.lng,