chore(frontend): shadcn-svelte / Tailwind / layerchart 工具链初始化

[变更性质]
本轮为维护性依赖与配置初始化，不改变业务页面（页面迁移见后续提交）。

[维护内容]
按 Leader 返工指令，前端 UI 组件库全量迁移 shadcn-svelte，图表渲染
从 echarts 换为 layerchart，需要一次性引入配套依赖与构建配置。

[实现方案]
package.json/pnpm-lock.yaml：tailwindcss@4、@tailwindcss/vite、
tw-animate-css、shadcn-svelte、bits-ui、tailwind-variants、clsx、
tailwind-merge、@lucide/svelte、layerchart、@fontsource-variable/inter
与 @types/node；echarts 保留至页面迁移完成后移除。pnpm-workspace.yaml
声明 allowBuilds（esbuild、@tailwindcss/oxide）。components.json 采用
mira preset，别名 $lib。tsconfig 新增 $lib paths；vite.config.ts 加入
tailwindcss 插件、$lib alias（vitest 需要）与 test 环境配置。
src/lib/components/ 为 shadcn 生成的 UI 组件源码（button/input/label/
card/badge/alert/select/table/tabs/separator/chart），src/lib/utils.ts
为 cn 工具。app.css 引入 tailwind 与 shadcn CSS 变量并调整为 teal
主题（primary #0f766e、radius 0.375rem、双主题 chart-1..5），保留
legacy 选择器（banner/beat/table.data/metric 等），mobileCss.test.ts
依赖其语义断言。

[影响范围]
构建链与主题变量；后续页面提交逐步消费这些组件，npm run check/test/
build 已全绿验证。

5 files changed, 371 insertions, 0 deletions

diff --git a/frontend/src/lib/components/ui/chart/chart-container.svelte b/frontend/src/lib/components/ui/chart/chart-container.svelte
new file mode 100644
index 0000000..3687ea0
--- /dev/null
+++ b/frontend/src/lib/components/ui/chart/chart-container.svelte
@@ -0,0 +1,80 @@
+<script lang="ts">
+	import { cn, type WithElementRef } from "$lib/utils.js";
+	import ChartStyle from "./chart-style.svelte";
+	import { setChartContext, type ChartConfig } from "./chart-utils.js";
+	import type { HTMLAttributes } from "svelte/elements";
+
+	const uid = $props.id();
+
+	let {
+		ref = $bindable(null),
+		id = uid,
+		class: className,
+		children,
+		config,
+		...restProps
+	}: WithElementRef<HTMLAttributes<HTMLElement>> & {
+		config: ChartConfig;
+	} = $props();
+
+	const chartId = $derived(`chart-${id || uid.replace(/:/g, "")}`);
+
+	setChartContext({
+		get config() {
+			return config;
+		},
+	});
+</script>
+
+<div
+	bind:this={ref}
+	data-chart={chartId}
+	data-slot="chart"
+	class={cn(
+		"flex aspect-video justify-center overflow-visible text-xs",
+		// Overrides
+		//
+		// Stroke around dots/marks when hovering
+		"[&_.lc-highlight-point]:stroke-transparent",
+		// override the default stroke color of lines
+		"[&_.lc-line]:stroke-border/50",
+
+		// by default, layerchart shows a line intersecting the point when hovering, this hides that
+		"[&_.lc-highlight-line]:stroke-0",
+
+		// by default, when you hover a point on a stacked series chart, it will drop the opacity
+		// of the other series, this overrides that
+		"[&_.lc-area-path]:opacity-100 [&_.lc-highlight-line]:opacity-100 [&_.lc-highlight-point]:opacity-100 [&_.lc-spline-path]:opacity-100 [&_.lc-text]:text-xs [&_.lc-text-svg]:overflow-visible",
+
+		// We don't want the little tick lines between the axis labels and the chart, so we remove
+		// the stroke. The alternative is to manually disable `tickMarks` on the x/y axis of every
+		// chart.
+		"[&_.lc-axis-tick]:stroke-0",
+
+		// We don't want to display the rule on the x/y axis, as there is already going to be
+		// a grid line there and rule ends up overlapping the marks because it is rendered after
+		// the marks
+		"[&_.lc-rule-x-line:not(.lc-grid-x-rule)]:stroke-0 [&_.lc-rule-y-line:not(.lc-grid-y-rule)]:stroke-0",
+		"[&_.lc-grid-x-radial-circle]:stroke-border [&_.lc-grid-x-radial-line]:stroke-border",
+		"[&_.lc-grid-y-radial-circle]:stroke-border [&_.lc-grid-y-radial-line]:stroke-border",
+
+		// Legend adjustments
+		"[&_.lc-legend-swatch-button]:items-center [&_.lc-legend-swatch-button]:gap-1.5",
+		"[&_.lc-legend-swatch-group]:items-center [&_.lc-legend-swatch-group]:gap-4",
+		"[&_.lc-legend-swatch]:size-2.5 [&_.lc-legend-swatch]:rounded-[2px]",
+
+		// Labels
+		"[&_.lc-labels-text:not([fill])]:fill-foreground [&_text]:stroke-transparent",
+
+		// Tick labels on th x/y axes
+		"[&_.lc-axis-tick-label]:fill-muted-foreground [&_.lc-axis-tick-label]:font-normal",
+		"[&_.lc-tooltip-rects-g]:fill-transparent",
+		"[&_.lc-layout-svg-g]:fill-transparent",
+		"[&_.lc-root-container]:w-full",
+		className
+	)}
+	{...restProps}
+>
+	<ChartStyle id={chartId} {config} />
+	{@render children?.()}
+</div>
diff --git a/frontend/src/lib/components/ui/chart/chart-style.svelte b/frontend/src/lib/components/ui/chart/chart-style.svelte
new file mode 100644
index 0000000..74c2b8a
--- /dev/null
+++ b/frontend/src/lib/components/ui/chart/chart-style.svelte
@@ -0,0 +1,37 @@
+<script lang="ts">
+	import { THEMES, type ChartConfig } from "./chart-utils.js";
+
+	let { id, config }: { id: string; config: ChartConfig } = $props();
+
+	const colorConfig = $derived(
+		config ? Object.entries(config).filter(([, config]) => config.theme || config.color) : null
+	);
+
+	const themeContents = $derived.by(() => {
+		if (!colorConfig || !colorConfig.length) return;
+
+		const themeContents = [];
+		for (const [_theme, prefix] of Object.entries(THEMES)) {
+			let content = `${prefix} [data-chart=${id}] {\n`;
+			const color = colorConfig.map(([key, itemConfig]) => {
+				const theme = _theme as keyof typeof itemConfig.theme;
+				const color = itemConfig.theme?.[theme] || itemConfig.color;
+				return color ? `\t--color-${key}: ${color};` : null;
+			});
+
+			content += color.join("\n") +"\n}";
+
+			themeContents.push(content);
+		}
+
+		return themeContents.join("\n");
+	});
+</script>
+
+{#if themeContents}
+	{#key id}
+		<svelte:element this={"style"}>
+			{themeContents}
+		</svelte:element>
+	{/key}
+{/if}
diff --git a/frontend/src/lib/components/ui/chart/chart-tooltip.svelte b/frontend/src/lib/components/ui/chart/chart-tooltip.svelte
new file mode 100644
index 0000000..8811436
--- /dev/null
+++ b/frontend/src/lib/components/ui/chart/chart-tooltip.svelte
@@ -0,0 +1,180 @@
+<script lang="ts">
+	import { getChartContext, Tooltip as TooltipPrimitive } from "layerchart";
+	import { cn, type WithElementRef, type WithoutChildren } from "$lib/utils.js";
+	import { getPayloadConfigFromPayload, useChart, type TooltipPayload } from "./chart-utils.js";
+	import type { Snippet } from "svelte";
+	import type { HTMLAttributes } from "svelte/elements";
+
+	// eslint-disable-next-line @typescript-eslint/no-explicit-any
+	function defaultFormatter(value: any, _payload: TooltipPayload[]) {
+		return `${value}`;
+	}
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		hideLabel = false,
+		indicator = "dot",
+		hideIndicator = false,
+		labelKey,
+		label,
+		labelFormatter = defaultFormatter,
+		labelClassName,
+		formatter,
+		nameKey,
+		color,
+		...restProps
+	}: WithoutChildren<WithElementRef<HTMLAttributes<HTMLDivElement>>> & {
+		hideLabel?: boolean;
+		label?: string;
+		indicator?: "line" | "dot" | "dashed";
+		nameKey?: string;
+		labelKey?: string;
+		hideIndicator?: boolean;
+		labelClassName?: string;
+		labelFormatter?: // eslint-disable-next-line @typescript-eslint/no-explicit-any
+			((value: any, payload: TooltipPayload[]) => string | number | Snippet) | null;
+		formatter?: Snippet<
+			[
+				{
+					value: unknown;
+					name: string;
+					item: TooltipPayload;
+					index: number;
+					payload: TooltipPayload[];
+				},
+			]
+		>;
+	} = $props();
+
+	const chart = useChart();
+	const chartCtx = getChartContext();
+
+	// Filter to series with defined values (important for item-based charts like Pie/Arc
+	// where only the hovered item has a value)
+	const visibleSeries = $derived(
+		chartCtx.tooltip.series.filter((s: TooltipPayload) => s.value !== undefined)
+	);
+
+	const formattedLabel = $derived.by(() => {
+		if (hideLabel || !visibleSeries?.length) return null;
+
+		const [item] = visibleSeries;
+		const tooltipData = chartCtx.tooltip.data;
+
+		// Get the x-axis label value from the raw tooltip data (e.g. a Date or month string)
+		const dataLabel = tooltipData != null ? chartCtx.x(tooltipData) : undefined;
+
+		const key = labelKey ?? item?.label ?? item?.key ?? "value";
+		const itemConfig = getPayloadConfigFromPayload(
+			chart.config,
+			item,
+			key,
+			tooltipData as Record<string, unknown> | null
+		);
+
+		let value: unknown;
+		if (!labelKey && typeof label === "string") {
+			value = chart.config[label as keyof typeof chart.config]?.label ?? label;
+		} else if (labelKey) {
+			value = itemConfig?.label ?? dataLabel;
+		} else {
+			value = dataLabel;
+		}
+
+		if (value === undefined) return null;
+		if (!labelFormatter) return value;
+		return labelFormatter(value, visibleSeries);
+	});
+
+	const nestLabel = $derived(visibleSeries.length === 1 && indicator !== "dot");
+</script>
+
+{#snippet TooltipLabel()}
+	{#if formattedLabel}
+		<div class={cn("font-medium", labelClassName)}>
+			{#if typeof formattedLabel === "function"}
+				{@render formattedLabel()}
+			{:else}
+				{formattedLabel}
+			{/if}
+		</div>
+	{/if}
+{/snippet}
+
+<TooltipPrimitive.Root variant="none">
+	<div
+		bind:this={ref}
+		class={cn(
+			"grid min-w-32 items-start gap-1.5 rounded-lg border border-border/50 bg-background px-2.5 py-1.5 text-xs shadow-xl",
+			className
+		)}
+		{...restProps}
+	>
+		{#if !nestLabel}
+			{@render TooltipLabel()}
+		{/if}
+		<div class="grid gap-1.5">
+			{#each visibleSeries as item, i (item.key + i)}
+				{@const key = `${nameKey || item.key || item.label || "value"}`}
+				{@const itemConfig = getPayloadConfigFromPayload(
+					chart.config,
+					item,
+					key,
+					chartCtx.tooltip.data
+				)}
+				{@const indicatorColor = color || item.config?.color || item.color}
+				<div
+					class={cn(
+						"flex w-full flex-wrap items-stretch gap-2 [&>svg]:h-2.5 [&>svg]:w-2.5 [&>svg]:text-muted-foreground",
+						indicator === "dot" && "items-center"
+					)}
+				>
+					{#if formatter && item.value !== undefined && item.label}
+						{@render formatter({
+							value: item.value,
+							name: item.label,
+							item,
+							index: i,
+							payload: visibleSeries,
+						})}
+					{:else}
+						{#if itemConfig?.icon}
+							<itemConfig.icon />
+						{:else if !hideIndicator}
+							<div
+								style="--color-bg: {indicatorColor}; --color-border: {indicatorColor};"
+								class={cn("shrink-0 rounded-[2px] border-(--color-border) bg-(--color-bg)", {
+									"h-2.5 w-2.5": indicator === "dot",
+									"h-full w-1": indicator === "line",
+									"w-0 border-[1.5px] border-dashed bg-transparent": indicator === "dashed",
+									"my-0.5": nestLabel && indicator === "dashed",
+								})}
+							></div>
+						{/if}
+						<div
+							class={cn(
+								"flex flex-1 shrink-0 justify-between leading-none",
+								nestLabel ? "items-end" : "items-center"
+							)}
+						>
+							<div class="grid gap-1.5">
+								{#if nestLabel}
+									{@render TooltipLabel()}
+								{/if}
+								<span class="text-muted-foreground">
+									{itemConfig?.label || item.label}
+								</span>
+							</div>
+							{#if item.value !== undefined}
+								<span class="font-mono font-medium text-foreground tabular-nums">
+									{item.value.toLocaleString()}
+								</span>
+							{/if}
+						</div>
+					{/if}
+				</div>
+			{/each}
+		</div>
+	</div>
+</TooltipPrimitive.Root>
diff --git a/frontend/src/lib/components/ui/chart/chart-utils.ts b/frontend/src/lib/components/ui/chart/chart-utils.ts
new file mode 100644
index 0000000..6e1f000
--- /dev/null
+++ b/frontend/src/lib/components/ui/chart/chart-utils.ts
@@ -0,0 +1,68 @@
+import { getContext, setContext, type Component, type Snippet } from "svelte";
+import type { Tooltip } from "layerchart";
+
+export const THEMES = { light: "", dark: ".dark" } as const;
+
+export type ChartConfig = {
+	[k in string]: {
+		label?: string;
+		icon?: Component;
+	} & (
+		| { color?: string; theme?: never }
+		| { color?: never; theme: Record<keyof typeof THEMES, string> }
+	);
+};
+
+export type ExtractSnippetParams<T> = T extends Snippet<[infer P]> ? P : never;
+
+export type TooltipPayload = Tooltip.TooltipSeries;
+
+// Helper to extract item config from a payload.
+export function getPayloadConfigFromPayload(
+	config: ChartConfig,
+	payload: TooltipPayload,
+	key: string,
+	// eslint-disable-next-line @typescript-eslint/no-explicit-any
+	data?: Record<string, any> | null
+) {
+	if (typeof payload !== "object" || payload === null) return undefined;
+
+	const payloadConfig =
+		"config" in payload && typeof payload.config === "object" && payload.config !== null
+			? payload.config
+			: undefined;
+
+	let configLabelKey: string = key;
+
+	if (payload.key === key) {
+		configLabelKey = payload.key;
+	} else if (payload.label === key) {
+		configLabelKey = payload.label;
+	} else if (key in payload && typeof payload[key as keyof typeof payload] === "string") {
+		configLabelKey = payload[key as keyof typeof payload] as string;
+	} else if (
+		payloadConfig !== undefined &&
+		key in payloadConfig &&
+		typeof payloadConfig[key as keyof typeof payloadConfig] === "string"
+	) {
+		configLabelKey = payloadConfig[key as keyof typeof payloadConfig] as string;
+	} else if (data != null && key in data && typeof data[key] === "string") {
+		configLabelKey = data[key] as string;
+	}
+
+	return configLabelKey in config ? config[configLabelKey] : config[key as keyof typeof config];
+}
+
+type ChartContextValue = {
+	config: ChartConfig;
+};
+
+const chartContextKey = Symbol("chart-context");
+
+export function setChartContext(value: ChartContextValue) {
+	return setContext(chartContextKey, value);
+}
+
+export function useChart() {
+	return getContext<ChartContextValue>(chartContextKey);
+}
diff --git a/frontend/src/lib/components/ui/chart/index.ts b/frontend/src/lib/components/ui/chart/index.ts
new file mode 100644
index 0000000..f22375e
--- /dev/null
+++ b/frontend/src/lib/components/ui/chart/index.ts
@@ -0,0 +1,6 @@
+import ChartContainer from "./chart-container.svelte";
+import ChartTooltip from "./chart-tooltip.svelte";
+
+export { getPayloadConfigFromPayload, type ChartConfig } from "./chart-utils.js";
+
+export { ChartContainer, ChartTooltip, ChartContainer as Container, ChartTooltip as Tooltip };