fix: CLI poll loop used UUID instead of queue cursor (last_id)

The poll loop was storing msg.ID (UUID string) as afterID, but the server
expects the integer queue cursor from last_id. This caused the CLI to
re-fetch ALL messages on every poll cycle.

- Change PollMessages to accept int64 afterID and return PollResult with LastID
- Track lastQID (queue cursor) instead of lastMsgID (UUID)
- Parse the wrapped MessagesResponse properly

cmd/chat-cli/api/client.go

@@ -97,21 +97,18 @@ func (c *Client) SendMessage(msg *Message) error {
 	return err
 }
 
-// PollMessages long-polls for new messages.
-func (c *Client) PollMessages(afterID string, timeout int) ([]Message, error) {
+// PollMessages long-polls for new messages. afterID is the queue cursor (last_id).
+func (c *Client) PollMessages(afterID int64, timeout int) (*PollResult, error) {
 	// Use a longer HTTP timeout than the server long-poll timeout.
 	client := &http.Client{Timeout: time.Duration(timeout+5) * time.Second}
 
 	params := url.Values{}
-	if afterID != "" {
-		params.Set("after", afterID)
+	if afterID > 0 {
+		params.Set("after", fmt.Sprintf("%d", afterID))
 	}
 	params.Set("timeout", fmt.Sprintf("%d", timeout))
 
-	path := "/api/v1/messages"
-	if len(params) > 0 {
-		path += "?" + params.Encode()
-	}
+	path := "/api/v1/messages?" + params.Encode()
 
 	req, err := http.NewRequest("GET", c.BaseURL+path, nil)
 	if err != nil {
@@ -134,18 +131,15 @@ func (c *Client) PollMessages(afterID string, timeout int) ([]Message, error) {
 		return nil, fmt.Errorf("HTTP %d: %s", resp.StatusCode, string(data))
 	}
 
-	// The server may return an array directly or wrapped.
-	var msgs []Message
-	if err := json.Unmarshal(data, &msgs); err != nil {
-		// Try wrapped format.
-		var wrapped MessagesResponse
-		if err2 := json.Unmarshal(data, &wrapped); err2 != nil {
-			return nil, fmt.Errorf("decode messages: %w (raw: %s)", err, string(data))
-		}
-		msgs = wrapped.Messages
+	var wrapped MessagesResponse
+	if err := json.Unmarshal(data, &wrapped); err != nil {
+		return nil, fmt.Errorf("decode messages: %w (raw: %s)", err, string(data))
 	}
 
-	return msgs, nil
+	return &PollResult{
+		Messages: wrapped.Messages,
+		LastID:   wrapped.LastID,
+	}, nil
 }
 
 // JoinChannel joins a channel via the unified command endpoint.

cmd/chat-cli/api/types.go

@@ -71,6 +71,13 @@ type ServerInfo struct {
 // MessagesResponse wraps polling results.
 type MessagesResponse struct {
 	Messages []Message `json:"messages"`
+	LastID   int64     `json:"last_id"`
+}
+
+// PollResult wraps the poll response including the cursor.
+type PollResult struct {
+	Messages []Message
+	LastID   int64
 }
 
 // ParseTS parses the message timestamp.

cmd/chat-cli/main.go

@@ -19,7 +19,7 @@ type App struct {
 	nick      string
 	target    string // current target (#channel or nick for DM)
 	connected bool
-	lastMsgID string
+	lastQID   int64 // queue cursor for polling
 	stopPoll  chan struct{}
 }
 
@@ -142,7 +142,7 @@ func (a *App) cmdConnect(serverURL string) {
 	a.client = client
 	a.nick = resp.Nick
 	a.connected = true
-	a.lastMsgID = ""
+	a.lastQID = 0
 	a.mu.Unlock()
 
 	a.ui.AddStatus(fmt.Sprintf("[green]Connected! Nick: %s, Session: %s", resp.Nick, resp.SessionID))
@@ -462,27 +462,28 @@ func (a *App) pollLoop() {
 
 		a.mu.Lock()
 		client := a.client
-		lastID := a.lastMsgID
+		lastQID := a.lastQID
 		a.mu.Unlock()
 
 		if client == nil {
 			return
 		}
 
-		msgs, err := client.PollMessages(lastID, 15)
+		result, err := client.PollMessages(lastQID, 15)
 		if err != nil {
 			// Transient error — retry after delay.
 			time.Sleep(2 * time.Second)
 			continue
 		}
 
-		for _, msg := range msgs {
+		if result.LastID > 0 {
+			a.mu.Lock()
+			a.lastQID = result.LastID
+			a.mu.Unlock()
+		}
+
+		for _, msg := range result.Messages {
 			a.handleServerMessage(&msg)
-			if msg.ID != "" {
-				a.mu.Lock()
-				a.lastMsgID = msg.ID
-				a.mu.Unlock()
-			}
 		}
 	}
 }