Fix channel join flooding and enhance TUI features

- Implemented separate PacketID counters for Ping, Pong, and Ack (protocol compliance).
- Encrypted outgoing Pong packets after handshake.
- Fixed 'clientmove' command by omitting empty 'cpw' parameter.
- Added fullscreen log view toggle ('f' key).
- Improved logging with multi-writer and timestamps.
- Updated .gitignore to exclude binaries and logs.

internal/client/commands.go

@@ -331,6 +331,32 @@ func (c *Client) processCommand(data []byte, pkt *protocol.Packet) error {
 
 				return c.SendCommand(moveCmd)
 			}
+		case "clientlist":
+			// Parse client info (usually received after connection for all clients)
+			nick := ""
+			clientID := uint16(0)
+			channelID := uint64(0)
+			if n, ok := args["client_nickname"]; ok {
+				nick = protocol.Unescape(n)
+			}
+			if cid, ok := args["clid"]; ok {
+				var id uint64
+				fmt.Sscanf(cid, "%d", &id)
+				clientID = uint16(id)
+			}
+			if ctid, ok := args["cid"]; ok {
+				fmt.Sscanf(ctid, "%d", &channelID)
+			}
+
+			// Don't emit for ourselves if we already handle it in initserver
+			if clientID != c.ClientID && clientID != 0 {
+				log.Printf("Existing client: %s (ID=%d) in Channel %d", nick, clientID, channelID)
+				c.emitEvent("client_enter", map[string]any{
+					"clientID":  clientID,
+					"nickname":  nick,
+					"channelID": channelID,
+				})
+			}
 		case "notifycliententerview":
 			// A client entered the server
 			nick := ""