fix: CLI client types mismatched server response format

- SessionResponse: use 'id' (int64) not 'session_id'/'client_id'
- StateResponse: match actual server response shape
- GetMembers: strip '#' from channel name for URL path
- These bugs prevented the CLI from working correctly with the server

cmd/chat-cli/api/client.go

@@ -7,6 +7,7 @@ import (
 	"io"
 	"net/http"
 	"net/url"
+	"strings"
 	"time"
 )
 
@@ -167,7 +168,9 @@ func (c *Client) ListChannels() ([]Channel, error) {
 
 // GetMembers returns members of a channel.
 func (c *Client) GetMembers(channel string) ([]string, error) {
-	data, err := c.do("GET", "/api/v1/channels/"+url.PathEscape(channel)+"/members", nil)
+	// Server route is /channels/{channel}/members where channel is without '#'
+	name := strings.TrimPrefix(channel, "#")
+	data, err := c.do("GET", "/api/v1/channels/"+url.PathEscape(name)+"/members", nil)
 	if err != nil {
 		return nil, err
 	}

cmd/chat-cli/api/types.go

@@ -9,18 +9,16 @@ type SessionRequest struct {
 
 // SessionResponse is the response from POST /api/v1/session.
 type SessionResponse struct {
-	SessionID string `json:"session_id"`
-	ClientID  string `json:"client_id"`
-	Nick      string `json:"nick"`
-	Token     string `json:"token"`
+	ID    int64  `json:"id"`
+	Nick  string `json:"nick"`
+	Token string `json:"token"`
 }
 
 // StateResponse is the response from GET /api/v1/state.
 type StateResponse struct {
-	SessionID string   `json:"session_id"`
-	ClientID  string   `json:"client_id"`
-	Nick      string   `json:"nick"`
-	Channels  []string `json:"channels"`
+	ID       int64    `json:"id"`
+	Nick     string   `json:"nick"`
+	Channels []string `json:"channels"`
 }
 
 // Message represents a chat message envelope.

cmd/chat-cli/main.go

@@ -145,7 +145,7 @@ func (a *App) cmdConnect(serverURL string) {
 	a.lastQID = 0
 	a.mu.Unlock()
 
-	a.ui.AddStatus(fmt.Sprintf("[green]Connected! Nick: %s, Session: %s", resp.Nick, resp.SessionID))
+	a.ui.AddStatus(fmt.Sprintf("[green]Connected! Nick: %s, Session: %d", resp.Nick, resp.ID))
 	a.ui.SetStatus(resp.Nick, "", "connected")
 
 	// Start polling.