fix: display error message on delete workspace error (#18654)

resolves coder/preview#155

When deleting a workspace, show an error dialog if deleting the
workspace is not possible.

![Screenshot 2025-06-28 at 10 06
47](https://github.com/user-attachments/assets/650bfb54-6ed9-4f41-a410-1333afeee0a4)

site/src/modules/workspaces/ErrorDialog/WorkspaceErrorDialog.tsx

@@ -19,6 +19,7 @@ interface WorkspaceErrorDialogProps {
 	workspaceOwner: string;
 	workspaceName: string;
 	templateVersionId: string;
+	isDeleting: boolean;
 }
 
 export const WorkspaceErrorDialog: FC<WorkspaceErrorDialogProps> = ({
@@ -29,6 +30,7 @@ export const WorkspaceErrorDialog: FC<WorkspaceErrorDialogProps> = ({
 	workspaceOwner,
 	workspaceName,
 	templateVersionId,
+	isDeleting,
 }) => {
 	const navigate = useNavigate();
 
@@ -52,7 +54,9 @@ export const WorkspaceErrorDialog: FC<WorkspaceErrorDialogProps> = ({
 		<Dialog open={open} onOpenChange={(isOpen) => !isOpen && onClose()}>
 			<DialogContent variant="destructive">
 				<DialogHeader>
-					<DialogTitle>Error building workspace</DialogTitle>
+					<DialogTitle>
+						Error {isDeleting ? "deleting" : "building"} workspace
+					</DialogTitle>
 					<DialogDescription className="flex flex-row gap-4">
 						<strong className="text-content-primary">Message</strong>{" "}
 						<span>{getErrorMessage(error, "Failed to build workspace.")}</span>

site/src/modules/workspaces/WorkspaceMoreActions/WorkspaceMoreActions.tsx

@@ -1,4 +1,6 @@
 import { MissingBuildParameters } from "api/api";
+import { isApiError } from "api/errors";
+import { type ApiError, getErrorMessage } from "api/errors";
 import {
 	changeVersion,
 	deleteWorkspace,
@@ -13,6 +15,7 @@ import {
 	DropdownMenuSeparator,
 	DropdownMenuTrigger,
 } from "components/DropdownMenu/DropdownMenu";
+import { displayError } from "components/GlobalSnackbar/utils";
 import {
 	CopyIcon,
 	DownloadIcon,
@@ -24,6 +27,7 @@ import {
 import { type FC, useEffect, useState } from "react";
 import { useMutation, useQuery, useQueryClient } from "react-query";
 import { Link as RouterLink } from "react-router-dom";
+import { WorkspaceErrorDialog } from "../ErrorDialog/WorkspaceErrorDialog";
 import { ChangeWorkspaceVersionDialog } from "./ChangeWorkspaceVersionDialog";
 import { DownloadLogsDialog } from "./DownloadLogsDialog";
 import { UpdateBuildParametersDialog } from "./UpdateBuildParametersDialog";
@@ -42,6 +46,11 @@ export const WorkspaceMoreActions: FC<WorkspaceMoreActionsProps> = ({
 }) => {
 	const queryClient = useQueryClient();
 
+	const [workspaceErrorDialog, setWorkspaceErrorDialog] = useState<{
+		open: boolean;
+		error?: ApiError;
+	}>({ open: false });
+
 	// Permissions
 	const { data: permissions } = useQuery(workspacePermissions(workspace));
 
@@ -58,11 +67,25 @@ export const WorkspaceMoreActions: FC<WorkspaceMoreActionsProps> = ({
 		),
 	);
 
+	const handleError = (error: unknown) => {
+		if (isApiError(error) && error.code === "ERR_BAD_REQUEST") {
+			setWorkspaceErrorDialog({
+				open: true,
+				error: error,
+			});
+		} else {
+			displayError(getErrorMessage(error, "Failed to delete workspace."));
+		}
+	};
+
 	// Delete
 	const [isConfirmingDelete, setIsConfirmingDelete] = useState(false);
-	const deleteWorkspaceMutation = useMutation(
-		deleteWorkspace(workspace, queryClient),
-	);
+	const deleteWorkspaceMutation = useMutation({
+		...deleteWorkspace(workspace, queryClient),
+		onError: (error: unknown) => {
+			handleError(error);
+		},
+	});
 
 	// Duplicate
 	const { duplicateWorkspace, isDuplicationReady } =
@@ -212,6 +235,17 @@ export const WorkspaceMoreActions: FC<WorkspaceMoreActionsProps> = ({
 					setIsConfirmingDelete(false);
 				}}
 			/>
+
+			<WorkspaceErrorDialog
+				open={workspaceErrorDialog.open}
+				error={workspaceErrorDialog.error}
+				onClose={() => setWorkspaceErrorDialog({ open: false })}
+				showDetail={workspace.template_use_classic_parameter_flow}
+				workspaceOwner={workspace.owner_name}
+				workspaceName={workspace.name}
+				templateVersionId={workspace.latest_build.template_version_id}
+				isDeleting={true}
+			/>
 		</>
 	);
 };

site/src/pages/WorkspacePage/WorkspaceReadyPage.tsx

@@ -392,6 +392,7 @@ export const WorkspaceReadyPage: FC<WorkspaceReadyPageProps> = ({
 				workspaceOwner={workspace.owner_name}
 				workspaceName={workspace.name}
 				templateVersionId={workspace.latest_build.template_version_id}
+				isDeleting={false}
 			/>
 		</>
 	);