feat: display the number of idle tasks in the navbar (#19471)

Depends on: https://github.com/coder/coder/pull/19377

Closes https://github.com/coder/coder/issues/19323

**Screenshot:**

<img width="1511" height="777" alt="Screenshot 2025-08-21 at 11 52 21"
src="https://github.com/user-attachments/assets/be04e507-bf04-47d0-8748-2f71b93b5685"
/>

**Screen recording:**


https://github.com/user-attachments/assets/f70b34fe-952b-427b-9bc9-71961ca23201



<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- New Features
- Added a Tasks navigation item showing a badge with the number of idle
tasks and a tooltip: “You have X tasks waiting for input.”

- Improvements
  - Fetches per-user tasks with periodic refresh for up-to-date counts.
- Updated active styling for the Tasks link for clearer navigation
state.
  - User menu now always appears on medium+ screens.

- Tests
- Expanded Storybook with preloaded, user-filtered task scenarios to
showcase idle/task states.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

site/src/modules/dashboard/Navbar/NavbarView.stories.tsx

@@ -1,13 +1,31 @@
 import { chromaticWithTablet } from "testHelpers/chromatic";
-import { MockUserMember, MockUserOwner } from "testHelpers/entities";
+import {
+	MockUserMember,
+	MockUserOwner,
+	MockWorkspace,
+	MockWorkspaceAppStatus,
+} from "testHelpers/entities";
 import { withDashboardProvider } from "testHelpers/storybook";
 import type { Meta, StoryObj } from "@storybook/react-vite";
 import { userEvent, within } from "storybook/test";
 import { NavbarView } from "./NavbarView";
 
+const tasksFilter = {
+	username: MockUserOwner.username,
+};
+
 const meta: Meta<typeof NavbarView> = {
 	title: "modules/dashboard/NavbarView",
-	parameters: { chromatic: chromaticWithTablet, layout: "fullscreen" },
+	parameters: {
+		chromatic: chromaticWithTablet,
+		layout: "fullscreen",
+		queries: [
+			{
+				key: ["tasks", tasksFilter],
+				data: [],
+			},
+		],
+	},
 	component: NavbarView,
 	args: {
 		user: MockUserOwner,
@@ -78,3 +96,36 @@ export const CustomLogo: Story = {
 		logo_url: "/icon/github.svg",
 	},
 };
+
+export const IdleTasks: Story = {
+	parameters: {
+		queries: [
+			{
+				key: ["tasks", tasksFilter],
+				data: [
+					{
+						prompt: "Task 1",
+						workspace: {
+							...MockWorkspace,
+							latest_app_status: {
+								...MockWorkspaceAppStatus,
+								state: "idle",
+							},
+						},
+					},
+					{
+						prompt: "Task 2",
+						workspace: MockWorkspace,
+					},
+					{
+						prompt: "Task 3",
+						workspace: {
+							...MockWorkspace,
+							latest_app_status: MockWorkspaceAppStatus,
+						},
+					},
+				],
+			},
+		],
+	},
+};

site/src/modules/dashboard/Navbar/NavbarView.tsx

@@ -1,13 +1,21 @@
 import { API } from "api/api";
 import type * as TypesGen from "api/typesGenerated";
+import { Badge } from "components/Badge/Badge";
 import { Button } from "components/Button/Button";
 import { ExternalImage } from "components/ExternalImage/ExternalImage";
 import { CoderIcon } from "components/Icons/CoderIcon";
+import {
+	Tooltip,
+	TooltipContent,
+	TooltipProvider,
+	TooltipTrigger,
+} from "components/Tooltip/Tooltip";
 import type { ProxyContextValue } from "contexts/ProxyContext";
 import { useWebpushNotifications } from "contexts/useWebpushNotifications";
 import { useEmbeddedMetadata } from "hooks/useEmbeddedMetadata";
 import { NotificationsInbox } from "modules/notifications/NotificationsInbox/NotificationsInbox";
 import type { FC } from "react";
+import { useQuery } from "react-query";
 import { NavLink, useLocation } from "react-router";
 import { cn } from "utils/cn";
 import { DeploymentDropdown } from "./DeploymentDropdown";
@@ -17,7 +25,7 @@ import { UserDropdown } from "./UserDropdown/UserDropdown";
 
 interface NavbarViewProps {
 	logo_url?: string;
-	user?: TypesGen.User;
+	user: TypesGen.User;
 	buildInfo?: TypesGen.BuildInfoResponse;
 	supportLinks?: readonly TypesGen.LinkConfig[];
 	onSignOut: () => void;
@@ -60,7 +68,7 @@ export const NavbarView: FC<NavbarViewProps> = ({
 				)}
 			</NavLink>
 
-			<NavItems className="ml-4" />
+			<NavItems className="ml-4" user={user} />
 
 			<div className="flex items-center gap-3 ml-auto">
 				{proxyContextValue && (
@@ -109,16 +117,14 @@ export const NavbarView: FC<NavbarViewProps> = ({
 					}
 				/>
 
-				{user && (
-					<div className="hidden md:block">
-						<UserDropdown
-							user={user}
-							buildInfo={buildInfo}
-							supportLinks={supportLinks}
-							onSignOut={onSignOut}
-						/>
-					</div>
-				)}
+				<div className="hidden md:block">
+					<UserDropdown
+						user={user}
+						buildInfo={buildInfo}
+						supportLinks={supportLinks}
+						onSignOut={onSignOut}
+					/>
+				</div>
 
 				<div className="md:hidden">
 					<MobileMenu
@@ -140,11 +146,11 @@ export const NavbarView: FC<NavbarViewProps> = ({
 
 interface NavItemsProps {
 	className?: string;
+	user: TypesGen.User;
 }
 
-const NavItems: FC<NavItemsProps> = ({ className }) => {
+const NavItems: FC<NavItemsProps> = ({ className, user }) => {
 	const location = useLocation();
-	const { metadata } = useEmbeddedMetadata();
 
 	return (
 		<nav className={cn("flex items-center gap-4 h-full", className)}>
@@ -153,7 +159,7 @@ const NavItems: FC<NavItemsProps> = ({ className }) => {
 					if (location.pathname.startsWith("/@")) {
 						isActive = true;
 					}
-					return cn(linkStyles.default, isActive ? linkStyles.active : "");
+					return cn(linkStyles.default, { [linkStyles.active]: isActive });
 				}}
 				to="/workspaces"
 			>
@@ -161,22 +167,76 @@ const NavItems: FC<NavItemsProps> = ({ className }) => {
 			</NavLink>
 			<NavLink
 				className={({ isActive }) => {
-					return cn(linkStyles.default, isActive ? linkStyles.active : "");
+					return cn(linkStyles.default, { [linkStyles.active]: isActive });
 				}}
 				to="/templates"
 			>
 				Templates
 			</NavLink>
-			{metadata["tasks-tab-visible"].value && (
-				<NavLink
-					className={({ isActive }) => {
-						return cn(linkStyles.default, isActive ? linkStyles.active : "");
-					}}
-					to="/tasks"
-				>
-					Tasks
-				</NavLink>
-			)}
+			<TasksNavItem user={user} />
 		</nav>
 	);
 };
+
+type TasksNavItemProps = {
+	user: TypesGen.User;
+};
+
+const TasksNavItem: FC<TasksNavItemProps> = ({ user }) => {
+	const { metadata } = useEmbeddedMetadata();
+	const canSeeTasks = Boolean(
+		metadata["tasks-tab-visible"].value ||
+			process.env.NODE_ENV === "development" ||
+			process.env.STORYBOOK,
+	);
+	const filter = {
+		username: user.username,
+	};
+	const { data: idleCount } = useQuery({
+		queryKey: ["tasks", filter],
+		queryFn: () => API.experimental.getTasks(filter),
+		refetchInterval: 1_000 * 60,
+		enabled: canSeeTasks,
+		refetchOnWindowFocus: true,
+		initialData: [],
+		select: (data) =>
+			data.filter((task) => task.workspace.latest_app_status?.state === "idle")
+				.length,
+	});
+
+	if (!canSeeTasks) {
+		return null;
+	}
+
+	return (
+		<NavLink
+			to="/tasks"
+			className={({ isActive }) => {
+				return cn(linkStyles.default, { [linkStyles.active]: isActive });
+			}}
+		>
+			Tasks
+			{idleCount > 0 && (
+				<TooltipProvider>
+					<Tooltip>
+						<TooltipTrigger asChild>
+							<Badge
+								variant="info"
+								size="xs"
+								className="ml-2"
+								aria-label={idleTasksLabel(idleCount)}
+							>
+								{idleCount}
+							</Badge>
+						</TooltipTrigger>
+						<TooltipContent>{idleTasksLabel(idleCount)}</TooltipContent>
+					</Tooltip>
+				</TooltipProvider>
+			)}
+		</NavLink>
+	);
+};
+
+function idleTasksLabel(count: number) {
+	return `You have ${count} ${count === 1 ? "task" : "tasks"} waiting for input`;
+}