fix(terminal): restore terminal input and cursor visibility

- Fix shell execution to avoid --login flag causing issues on some shells
- Improve terminal initialization timing with requestAnimationFrame
- Force display visibility on xterm instances via CSS
- Ensure container has proper min-height and overflow handling

Assisted-by: MiniMax-M2.7 via Crush <crush@charm.land>

internal/api/terminal.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 	"os"
 	"os/exec"
+	"path/filepath"
 	"runtime"
 	"strings"
 	"sync"
@@ -109,12 +110,16 @@ func (s *Server) handleTerminalWS(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 
-		if strings.Contains(shell, "wsl") {
+		shellName := filepath.Base(shell)
+		switch shellName {
+		case "wsl":
 			cmd = exec.Command(shell, "--shell-type", "login")
-		} else if strings.Contains(shell, "powershell") || strings.Contains(shell, "pwsh") {
+		case "powershell", "pwsh":
 			cmd = exec.Command(shell, "-NoLogo", "-NoProfile")
-		} else {
+		case "fish":
 			cmd = exec.Command(shell, "--login")
+		default:
+			cmd = exec.Command(shell)
 		}
 	}