Improve admin visitor context layout

server.js

@@ -570,7 +570,7 @@ function formatConversationSummary(row) {
     language: row.language,
     timezone: row.timezone,
     ip: row.ip,
-    countryCode: row.country_code,
+    countryCode: row.country_code || countryFromTimezone(row.timezone) || countryFromLanguage(row.language),
     vpnRisk: Boolean(row.vpn_risk),
     lastBody: row.last_body,
     messageCount: row.message_count,
@@ -750,6 +750,23 @@ function countryFromHeaders(req) {
   return req.headers["cf-ipcountry"] || req.headers["x-vercel-ip-country"] || null;
 }
 
+function countryFromTimezone(timezone) {
+  const zones = {
+    "Europe/Prague": "CZ",
+    "Europe/Bratislava": "SK",
+    "Europe/Warsaw": "PL",
+    "Europe/Berlin": "DE",
+    "Europe/Vienna": "AT",
+    "Europe/Budapest": "HU"
+  };
+  return zones[String(timezone || "")] || null;
+}
+
+function countryFromLanguage(language) {
+  const match = String(language || "").match(/-([A-Za-z]{2})\b/);
+  return match ? match[1].toUpperCase() : null;
+}
+
 function isAllowedImageAttachment(attachment, buffer) {
   const extension = path.extname(attachment.name || "").toLowerCase();
   const type = String(attachment.type || "").toLowerCase();