feat: add app iframe controls (#18421)

Add a home and "open in new tab" button.  Other controls are not 
possible due to cross-origin restrictions.

Closes #18178

---------

Co-authored-by: BrunoQuaresma <bruno_nonato_quaresma@hotmail.com>

site/src/pages/TaskPage/TaskAppIframe.tsx

@@ -1,7 +1,16 @@
 import type { WorkspaceApp } from "api/typesGenerated";
+import { Button } from "components/Button/Button";
+import {
+	DropdownMenu,
+	DropdownMenuContent,
+	DropdownMenuItem,
+	DropdownMenuTrigger,
+} from "components/DropdownMenu/DropdownMenu";
+import { EllipsisVertical, ExternalLinkIcon, HouseIcon } from "lucide-react";
 import { useAppLink } from "modules/apps/useAppLink";
 import type { Task } from "modules/tasks/tasks";
-import type { FC } from "react";
+import { type FC, useRef } from "react";
+import { Link as RouterLink } from "react-router-dom";
 import { cn } from "utils/cn";
 
 type TaskAppIFrameProps = {
@@ -31,24 +40,69 @@ export const TaskAppIFrame: FC<TaskAppIFrameProps> = ({
 		workspace: task.workspace,
 	});
 
-	let href = link.href;
-	try {
-		const url = new URL(link.href);
-		if (pathname) {
-			url.pathname = pathname;
+	const appHref = (): string => {
+		try {
+			const url = new URL(link.href, location.href);
+			if (pathname) {
+				url.pathname = pathname;
+			}
+			return url.toString();
+		} catch (err) {
+			console.warn(`Failed to parse URL ${link.href} for app ${app.id}`, err);
+			return link.href;
 		}
-		href = url.toString();
-	} catch (err) {
-		console.warn(`Failed to parse URL ${link.href} for app ${app.id}`, err);
-	}
+	};
+
+	const frameRef = useRef<HTMLIFrameElement>(null);
+	const frameSrc = appHref();
 
 	return (
-		<iframe
-			src={href}
-			title={link.label}
-			loading="eager"
-			className={cn([active ? "block" : "hidden", "w-full h-full border-0"])}
-			allow="clipboard-read; clipboard-write"
-		/>
+		<div className={cn([active ? "flex" : "hidden", "w-full h-full flex-col"])}>
+			<div className="bg-surface-tertiary flex items-center p-2 py-1 gap-1">
+				<Button
+					size="icon"
+					variant="subtle"
+					onClick={(e) => {
+						e.preventDefault();
+						if (frameRef.current?.contentWindow) {
+							frameRef.current.contentWindow.location.href = appHref();
+						}
+					}}
+				>
+					<HouseIcon />
+					<span className="sr-only">Home</span>
+				</Button>
+
+				{/* Possibly we will put a URL bar here, but for now we cannot due to
+				 * cross-origin restrictions in iframes. */}
+				<div className="w-full"></div>
+
+				<DropdownMenu>
+					<DropdownMenuTrigger asChild>
+						<Button size="icon" variant="subtle" aria-label="More options">
+							<EllipsisVertical aria-hidden="true" />
+							<span className="sr-only">More options</span>
+						</Button>
+					</DropdownMenuTrigger>
+					<DropdownMenuContent align="end">
+						<DropdownMenuItem asChild>
+							<RouterLink to={frameSrc} target="_blank">
+								<ExternalLinkIcon />
+								Open app in new tab
+							</RouterLink>
+						</DropdownMenuItem>
+					</DropdownMenuContent>
+				</DropdownMenu>
+			</div>
+
+			<iframe
+				ref={frameRef}
+				src={frameSrc}
+				title={link.label}
+				loading="eager"
+				className={"w-full h-full border-0"}
+				allow="clipboard-read; clipboard-write"
+			/>
+		</div>
 	);
 };

site/src/pages/TaskPage/TaskApps.tsx

@@ -57,19 +57,21 @@ export const TaskApps: FC<TaskAppsProps> = ({ task }) => {
 
 	return (
 		<main className="flex-1 flex flex-col">
-			<div className="border-0 border-b border-border border-solid w-full p-1 flex gap-2">
-				{embeddedApps.map((app) => (
-					<TaskAppButton
-						key={app.id}
-						task={task}
-						app={app}
-						active={app.id === activeAppId}
-						onClick={(e) => {
-							e.preventDefault();
-							setActiveAppId(app.id);
-						}}
-					/>
-				))}
+			<div className="w-full flex items-center border-0 border-b border-border border-solid">
+				<div className="p-2 pb-0 flex gap-2 items-center">
+					{embeddedApps.map((app) => (
+						<TaskAppTab
+							key={app.id}
+							task={task}
+							app={app}
+							active={app.id === activeAppId}
+							onClick={(e) => {
+								e.preventDefault();
+								setActiveAppId(app.id);
+							}}
+						/>
+					))}
+				</div>
 
 				{externalApps.length > 0 && (
 					<div className="ml-auto">
@@ -122,19 +124,14 @@ export const TaskApps: FC<TaskAppsProps> = ({ task }) => {
 	);
 };
 
-type TaskAppButtonProps = {
+type TaskAppTabProps = {
 	task: Task;
 	app: WorkspaceApp;
 	active: boolean;
 	onClick: (e: React.MouseEvent<HTMLAnchorElement>) => void;
 };
 
-const TaskAppButton: FC<TaskAppButtonProps> = ({
-	task,
-	app,
-	active,
-	onClick,
-}) => {
+const TaskAppTab: FC<TaskAppTabProps> = ({ task, app, active, onClick }) => {
 	const agent = task.workspace.latest_build.resources
 		.flatMap((r) => r.agents)
 		.filter((a) => !!a)
@@ -156,7 +153,11 @@ const TaskAppButton: FC<TaskAppButtonProps> = ({
 			key={app.id}
 			asChild
 			className={cn([
-				{ "text-content-primary": active },
+				"px-3",
+				{
+					"text-content-primary bg-surface-tertiary rounded-sm rounded-b-none":
+						active,
+				},
 				{ "opacity-75 hover:opacity-100": !active },
 			])}
 		>