fix(terminal): improve shell resolution with better error handling and ws proxy support

The `len(shell) <= 1` guard was too aggressive and provided no diagnostic info.
Now trims whitespace, resolves path in all cases, falls back to /bin/sh, and
logs detailed context for debugging. Also enable WebSocket proxying in Vite dev.

internal/api/terminal.go

@@ -56,13 +56,17 @@ func (s *Server) handleTerminalWS(w http.ResponseWriter, r *http.Request) {
 	var initMsg wsMessage
 	_, raw, err := conn.ReadMessage()
 	if err != nil {
+		log.Printf("terminal: read init message failed: %v", err)
 		conn.WriteJSON(wsMessage{Type: "error", Data: "failed to read init message"})
 		return
 	}
+	log.Printf("terminal: init message received: %s", string(raw))
 	if err := json.Unmarshal(raw, &initMsg); err != nil {
+		log.Printf("terminal: unmarshal init message failed: %v", err)
 		conn.WriteJSON(wsMessage{Type: "error", Data: "invalid init message"})
 		return
 	}
+	log.Printf("terminal: init type=%q data=%q", initMsg.Type, initMsg.Data)
 
 	var cmd *exec.Cmd
 
@@ -96,23 +100,26 @@ func (s *Server) handleTerminalWS(w http.ResponseWriter, r *http.Request) {
 
 		cmd = exec.Command("ssh", sshArgs...)
 	} else {
-		shell := initMsg.Data
+		shell := strings.TrimSpace(initMsg.Data)
+		log.Printf("terminal: requested shell=%q, trimmed=%q", initMsg.Data, shell)
 		if shell == "" {
 			shell = detectShell()
-		} else {
-			if path, err := exec.LookPath(shell); err == nil {
-				shell = path
-			}
+			log.Printf("terminal: auto-detected shell=%q", shell)
 		}
 
-		// Ignore invalid shell paths (e.g., single characters from race condition)
-		if len(shell) <= 1 {
-			conn.WriteJSON(wsMessage{Type: "error", Data: "invalid shell config"})
-			return
+		if shell == "" {
+			log.Printf("terminal: no shell detected, falling back to /bin/sh")
+			shell = "/bin/sh"
+		}
+
+		if path, err := exec.LookPath(shell); err == nil {
+			shell = path
+			log.Printf("terminal: resolved shell path=%q", shell)
 		}
 
 		if _, err := os.Stat(shell); err != nil {
-			conn.WriteJSON(wsMessage{Type: "error", Data: fmt.Sprintf("shell not found: %s", shell)})
+			log.Printf("terminal: shell stat failed: %v for %q", err, shell)
+			conn.WriteJSON(wsMessage{Type: "error", Data: fmt.Sprintf("shell not found: %s (resolved from: %q)", shell, initMsg.Data)})
 			return
 		}
 
@@ -131,12 +138,14 @@ func (s *Server) handleTerminalWS(w http.ResponseWriter, r *http.Request) {
 
 	cmd.Env = append(os.Environ(), "TERM=xterm-256color")
 
+	log.Printf("terminal: starting pty with cmd=%q args=%v", cmd.Path, cmd.Args)
 	ptmx, err := pty.Start(cmd)
 	if err != nil {
-		log.Printf("pty start: %v", err)
+		log.Printf("terminal: pty start failed: %v", err)
 		conn.WriteJSON(wsMessage{Type: "error", Data: err.Error()})
 		return
 	}
+	log.Printf("terminal: pty started successfully")
 	defer func() {
 		ptmx.Close()
 		if cmd.Process != nil {

web/vite.config.js

@@ -13,6 +13,7 @@ export default defineConfig({
       '/api': {
         target: 'http://127.0.0.1:8095',
         changeOrigin: true,
+        ws: true,
       },
     },
   },