Add timestamps and fix BLE scan timing

firmware/esp32/xterra-controller/logger.cpp

@@ -2,18 +2,40 @@
 
 LogLevel currentLogLevel = LOG_INFO;
 
+String logTimestamp() {
+    unsigned long seconds = millis() / 1000;
+    unsigned long minutes = seconds / 60;
+    unsigned long hours = minutes / 60;
+
+    char buffer[16];
+    snprintf(
+        buffer,
+        sizeof(buffer),
+        "[%02lu:%02lu:%02lu]",
+        hours % 100,
+        minutes % 60,
+        seconds % 60
+    );
+
+    return String(buffer);
+}
+
 void setLogLevel(LogLevel level) {
     currentLogLevel = level;
 }
 
 void logInfo(const String& message) {
     if (currentLogLevel >= LOG_INFO) {
+        Serial.print(logTimestamp());
+        Serial.print(" ");
         Serial.println(message);
     }
 }
 
 void logDebug(const String& message) {
     if (currentLogLevel >= LOG_DEBUG) {
+        Serial.print(logTimestamp());
+        Serial.print(" ");
         Serial.println(message);
     }
 }