redesign, broadcast server crash fix

source/util.cpp

@@ -126,6 +126,16 @@ std::string StringUtils::removeNotAscii(std::string str)
     return str;
 }
 
+std::string StringUtils::elide(const std::string& s, size_t maxChars)
+{
+    if (s.size() <= maxChars || maxChars < 6) return s;
+    constexpr const char* dots = "...";
+    size_t budget = maxChars - 3;
+    size_t head = (budget + 1) / 2;
+    size_t tail = budget - head;
+    return s.substr(0, head) + dots + s.substr(s.size() - tail);
+}
+
 HidsysNotificationLedPattern blinkLedPattern(u8 times)
 {
     HidsysNotificationLedPattern pattern;