fix(tasks): fix task cancellation process tree leak, emit cancelled events, and refine status badges styling

internal/executor/executor.go

@@ -161,6 +161,9 @@ func ExecuteWithHooks(ctx context.Context, req Request, stdout, stderr io.Writer
 	shell, args := utils.GetShellCommand(req.Command)
 	cmd := exec.CommandContext(execCtx, shell, args...)
 
+	usePty := runtime.GOOS != "windows" && stdout != nil && (stdout == stderr || stdout == io.Discard)
+	SetProcessGroupAndCancel(cmd, usePty)
+
 	// 设置工作目录
 	// 设置工作目录
 	workDir := strings.TrimSpace(req.WorkDir)

internal/executor/proc_unix.go

@@ -0,0 +1,21 @@
+//go:build !windows
+
+package executor
+
+import (
+	"os/exec"
+	"syscall"
+)
+
+func SetProcessGroupAndCancel(cmd *exec.Cmd, usePty bool) {
+	if !usePty {
+		cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
+	}
+	cmd.Cancel = func() error {
+		if cmd.Process != nil {
+			// Kill the entire process group by sending SIGKILL to negative PID
+			return syscall.Kill(-cmd.Process.Pid, syscall.SIGKILL)
+		}
+		return nil
+	}
+}

internal/executor/proc_windows.go

@@ -0,0 +1,18 @@
+//go:build windows
+
+package executor
+
+import (
+	"fmt"
+	"os/exec"
+)
+
+func SetProcessGroupAndCancel(cmd *exec.Cmd, usePty bool) {
+	cmd.Cancel = func() error {
+		if cmd.Process != nil {
+			killCmd := exec.Command("taskkill", "/F", "/T", "/PID", fmt.Sprintf("%d", cmd.Process.Pid))
+			return killCmd.Run()
+		}
+		return nil
+	}
+}