feat: don't redirect to task page when it is created (#19919)

**Demo:**

https://github.com/user-attachments/assets/3ffaa13e-553f-43d2-9fad-d4d3ea7a4ede

Closes https://github.com/coder/coder/issues/19675

site/src/pages/TasksPage/TaskPrompt.tsx

@@ -10,7 +10,7 @@ import type {
 import { ErrorAlert } from "components/Alert/ErrorAlert";
 import { Button } from "components/Button/Button";
 import { ExternalImage } from "components/ExternalImage/ExternalImage";
-import { displayError } from "components/GlobalSnackbar/utils";
+import { displayError, displaySuccess } from "components/GlobalSnackbar/utils";
 import { Link } from "components/Link/Link";
 import {
 	Select,
@@ -33,7 +33,6 @@ import { RedoIcon, RotateCcwIcon, SendIcon } from "lucide-react";
 import { AI_PROMPT_PARAMETER_NAME } from "modules/tasks/tasks";
 import { type FC, useEffect, useState } from "react";
 import { useMutation, useQuery, useQueryClient } from "react-query";
-import { useNavigate } from "react-router";
 import TextareaAutosize from "react-textarea-autosize";
 import { docs } from "utils/docs";
 
@@ -50,8 +49,6 @@ export const TaskPrompt: FC<TaskPromptProps> = ({
 	error,
 	onRetry,
 }) => {
-	const navigate = useNavigate();
-
 	if (error) {
 		return <TaskPromptLoadingError error={error} onRetry={onRetry} />;
 	}
@@ -64,8 +61,8 @@ export const TaskPrompt: FC<TaskPromptProps> = ({
 	return (
 		<CreateTaskForm
 			templates={templates}
-			onSuccess={(task) => {
-				navigate(`/tasks/${task.owner_name}/${task.name}`);
+			onSuccess={() => {
+				displaySuccess("Task created successfully");
 			}}
 		/>
 	);
@@ -195,9 +192,7 @@ const CreateTaskForm: FC<CreateTaskFormProps> = ({ templates, onSuccess }) => {
 				template_version_preset_id: selectedPresetId,
 			}),
 		onSuccess: async (task) => {
-			await queryClient.invalidateQueries({
-				queryKey: ["tasks"],
-			});
+			await queryClient.invalidateQueries({ queryKey: ["tasks"] });
 			onSuccess(task);
 		},
 	});

site/src/pages/TasksPage/TasksPage.stories.tsx

@@ -226,6 +226,7 @@ export const LoadedTasksWaitingForInputTab: Story = {
 };
 
 export const CreateTaskSuccessfully: Story = {
+	decorators: [withGlobalSnackbar],
 	parameters: {
 		reactRouter: reactRouterParameters({
 			location: {
@@ -261,8 +262,17 @@ export const CreateTaskSuccessfully: Story = {
 			await userEvent.click(submitButton);
 		});
 
-		await step("Redirects to the task page", async () => {
-			await canvas.findByText(/task page/i);
+		await step("Displays success message", async () => {
+			const body = within(canvasElement.ownerDocument.body);
+			const successMessage = await body.findByText(/task created/i);
+			expect(successMessage).toBeInTheDocument();
+		});
+
+		await step("Find task in the table", async () => {
+			const table = canvasElement.querySelector("table");
+			await waitFor(() => {
+				expect(table).toHaveTextContent(MockNewTaskData.prompt);
+			});
 		});
 	},
 };

site/src/pages/TasksPage/TasksPage.tsx

@@ -43,6 +43,15 @@ const TasksPage: FC = () => {
 		queryKey: ["tasks", filter],
 		queryFn: () => API.experimental.getTasks(filter),
 		refetchInterval: 10_000,
+		// TODO: Switch to sorting by latest_status_app.created_at once it’s reliable.
+		// Currently, it doesn’t always update fast enough for a good UX, so we’re
+		// temporarily sorting by workspace.created_at instead.
+		select: (tasks) =>
+			tasks.toSorted(
+				(a, b) =>
+					new Date(b.workspace.created_at).getTime() -
+					new Date(a.workspace.created_at).getTime(),
+			),
 	});
 	const idleTasks = tasksQuery.data?.filter(
 		(task) => task.workspace.latest_app_status?.state === "idle",