add portfolio allocation donut chart on dashboard

apps/desktop/src/routes/index.svelte

@@ -15,6 +15,9 @@
 	import WalletIcon from '@lucide/svelte/icons/wallet'
 	import Loader from '$lib/components/loader.svelte'
 	import { frontendLog, frontendLogError } from '$lib/electrobun.js'
+	import { arc } from 'd3-shape'
+	import { tweened } from 'svelte/motion'
+	import { cubicOut } from 'svelte/easing'
 
 	let feError = $state<string | null>(null)
 
@@ -43,6 +46,33 @@
 
 	const portfolioUsd = $derived(xrpTotalUsd + xmrTotalUsd)
 
+	const xrpShare = $derived(portfolioUsd > 0 ? xrpTotalUsd / portfolioUsd : 0)
+	const xmrShare = $derived(
+		portfolioUsd > 0 ? xmrTotalUsd / portfolioUsd : 0,
+	)
+
+	const tweenedUsd = tweened(0, { duration: 600, easing: cubicOut })
+	const tweenedXrpShare = tweened(0, { duration: 600, easing: cubicOut })
+
+	$effect(() => {
+		tweenedUsd.set(portfolioUsd)
+		tweenedXrpShare.set(xrpShare)
+	})
+
+	const donut = $derived.by(() => {
+		if (portfolioUsd <= 0) return { xrp: '', xmr: '' }
+		const a = arc<{ startAngle: number; endAngle: number }>()
+			.innerRadius(62)
+			.outerRadius(80)
+			.padAngle(0.02)
+		const start = -Math.PI / 2
+		const endXrp = start + $tweenedXrpShare * 2 * Math.PI
+		return {
+			xrp: a({ startAngle: start, endAngle: endXrp }) ?? '',
+			xmr: a({ startAngle: endXrp, endAngle: start + 2 * Math.PI }) ?? '',
+		}
+	})
+
 	const hasXrp = $derived(xrpWallet.wallets.length > 0)
 	const hasXmr = $derived(moneroWallet.wallets.length > 0)
 	const noWallets = $derived(!hasXrp && !hasXmr)
@@ -69,6 +99,8 @@
 			maximumFractionDigits: dp,
 		})
 
+	const fmtPct = (v: number) => `${Math.round(v * 100)}%`
+
 	onMount(() => {
 		frontendLog('dashboard mounted')
 	})
@@ -154,6 +186,43 @@
 				{/if}
 			</div>
 
+			<Card>
+				<CardHeader class="pb-2">
+					<CardTitle class="text-base">Portfolio Allocation</CardTitle>
+					<CardDescription class="text-xs">
+						Share of your balance by asset
+					</CardDescription>
+				</CardHeader>
+				<CardContent class="flex flex-col items-center gap-5 py-6">
+					<div class="relative">
+						<svg viewBox="-100 -100 200 200" class="size-48">
+							<path d={donut.xrp} fill="#0EA5E9" />
+							<path d={donut.xmr} fill="#F97316" />
+						</svg>
+						<div
+							class="absolute inset-0 flex flex-col items-center justify-center">
+							<p
+								class="text-lg font-semibold tabular-nums">$
+								{fmtUsd($tweenedUsd)}
+							</p>
+							<p class="text-xs text-muted-foreground">
+								Portfolio
+							</p>
+						</div>
+					</div>
+					<div class="flex gap-5 text-xs">
+						<span class="flex items-center gap-1.5">
+							<span class="size-2.5 rounded-full bg-sky-500"></span>
+							XRP · {fmtPct($tweenedXrpShare)}
+						</span>
+						<span class="flex items-center gap-1.5">
+							<span class="size-2.5 rounded-full bg-orange-500"></span>
+							XMR · {fmtPct(1 - $tweenedXrpShare)}
+						</span>
+					</div>
+				</CardContent>
+			</Card>
+
 			<div class="grid grid-cols-1 gap-4 sm:grid-cols-2">
 			<button
 				onclick={() => navigate('/xrp')}