client page: add tutorial, layout ui improvements

src/lib/components/app/wireguard-guide/wireguard-guide.svelte

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+<script lang="ts">
+	import * as Tabs from '$lib/components/ui/tabs';
+	import * as Card from '$lib/components/ui/card';
+	import getItOnGooglePlay from '$lib/assets/GetItOnGooglePlay_Badge_Web_color_English.png';
+	import guideVideo from '$lib/assets/guide-client.mp4';
+</script>
+
+<Tabs.Root value="android" class="max-w-xl">
+	<Tabs.List class="grid w-full grid-cols-3">
+		<Tabs.Trigger value="android">Android</Tabs.Trigger>
+		<Tabs.Trigger value="windows">Windows</Tabs.Trigger>
+		<Tabs.Trigger value="other">Other</Tabs.Trigger>
+	</Tabs.List>
+	<Tabs.Content value="android">
+		<Card.Root>
+			<Card.Header class="max-sm:px-4 max-sm:pt-4">
+				<Card.Title>WireGuard on Android</Card.Title>
+			</Card.Header>
+			<Card.Content class="max-sm:p-4">
+				<ol class="flex flex-col gap-2">
+					<li>
+						<div class="flex flex-col gap-2">
+							Install the WireGuard app
+							<a
+								class="contents"
+								href="https://play.google.com/store/apps/details?id=com.wireguard.android"
+								target="_blank"
+								rel="noopener noreferrer"
+							>
+								<img class="size-min" alt="Get it on google play" src={getItOnGooglePlay} />
+							</a>
+						</div>
+					</li>
+					<li>
+						<div class="flex flex-col gap-2">
+							<p>Download the configuration file and import it</p>
+							<aside>Alternatively, you can scan the QR code with the WireGuard app</aside>
+							<video controls muted preload="metadata" class="max-h-screen">
+								<source src={guideVideo} type="video/mp4" />
+							</video>
+						</div>
+					</li>
+				</ol>
+			</Card.Content>
+		</Card.Root>
+	</Tabs.Content>
+	<Tabs.Content value="windows">
+		<Card.Root>
+			<Card.Header>
+				<Card.Title>WireGuard on Windows</Card.Title>
+			</Card.Header>
+			<Card.Content>
+				<p>
+					<a
+						class="underline"
+						href="https://download.wireguard.com/windows-client/wireguard-installer.exe"
+						target="_blank"
+						rel="noopener noreferrer"
+					>
+						Download WireGuard
+					</a>
+				</p>
+			</Card.Content>
+		</Card.Root>
+	</Tabs.Content>
+	<Tabs.Content value="other">
+		<Card.Root>
+			<Card.Header>
+				<Card.Title>WireGuard on Other Platforms</Card.Title>
+			</Card.Header>
+			<Card.Content>
+				<p>
+					You can download the WireGuard client from the <a
+						class="underline"
+						href="https://www.wireguard.com/install/"
+						target="_blank"
+						rel="noopener noreferrer"
+					>
+						official website
+					</a>.
+				</p>
+			</Card.Content>
+		</Card.Root>
+	</Tabs.Content>
+</Tabs.Root>