fix: improve error message when auto-detected identity is unsupported

When a user-only shortcut is invoked without --as and auto-detect
resolves to bot (no login / expired token), show a clear message
suggesting `lark-cli auth login` instead of the misleading
"--as bot is not supported".

Change-Id: I684e6a422a907f428a68e8e4724fa8c50b13045d
Co-Authored-By: AI

internal/cmdutil/factory.go

@@ -127,8 +127,8 @@ func (f *Factory) CheckIdentity(as core.Identity, supported []string) error {
 	list := strings.Join(supported, ", ")
 	if f.IdentityAutoDetected {
 		return output.ErrValidation(
-			"resolved identity %q (via auto-detect or default-as) is not supported, this command only supports: %s\nhint: use --as %s",
-			as, list, supported[0])
+			"this command requires %s identity, but no user login was found (auto-detected as %s)\nhint: run `lark-cli auth login` first, then retry",
+			list, as)
 	}
 	return fmt.Errorf("--as %s is not supported, this command only supports: %s", as, list)
 }

internal/cmdutil/factory_test.go

@@ -174,15 +174,15 @@ func TestCheckIdentity_Unsupported_AutoDetected(t *testing.T) {
 	f, _, _, _ := TestFactory(t, &core.CliConfig{AppID: "a", AppSecret: "s"})
 	f.IdentityAutoDetected = true
 
-	err := f.CheckIdentity(core.AsUser, []string{"bot"})
+	err := f.CheckIdentity(core.AsBot, []string{"user"})
 	if err == nil {
 		t.Fatal("expected error")
 	}
-	if !strings.Contains(err.Error(), "resolved identity") {
-		t.Errorf("expected 'resolved identity' in error, got: %v", err)
+	if !strings.Contains(err.Error(), "requires user identity") {
+		t.Errorf("expected 'requires user identity' in error, got: %v", err)
 	}
-	if !strings.Contains(err.Error(), "hint: use --as bot") {
-		t.Errorf("expected hint in error, got: %v", err)
+	if !strings.Contains(err.Error(), "auth login") {
+		t.Errorf("expected 'auth login' hint in error, got: %v", err)
 	}
 }