Fix auto-attack stalling after SMSG_ATTACKSTOP and remove stale comments

Re-send CMSG_ATTACKSWING every second while auto-attacking so combat
resumes automatically when the server pauses the attack loop (out of
range, etc). Previously the client kept autoAttacking=true but never
re-engaged, requiring the player to manually right-click again.

Also remove leftover single-player/offline references from comments.

src/audio/ambient_sound_manager.cpp

@@ -771,7 +771,7 @@ void AmbientSoundManager::updateBellTolls(float deltaTime) {
         return;
     }
 
-    // Get current system time (server time for single-player)
+    // Get current system time
     auto now = std::chrono::system_clock::now();
     std::time_t currentTime = std::chrono::system_clock::to_time_t(now);
     std::tm* localTime = std::localtime(&currentTime);