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。

13 files changed, 297 insertions, 0 deletions

diff --git a/frontend/src/lib/components/ui/select/index.ts b/frontend/src/lib/components/ui/select/index.ts
new file mode 100644
index 0000000..4960d45
--- /dev/null
+++ b/frontend/src/lib/components/ui/select/index.ts
@@ -0,0 +1,40 @@
+import Content from "./select-content.svelte";
+import GroupHeading from "./select-group-heading.svelte";
+import Group from "./select-group.svelte";
+import Item from "./select-item.svelte";
+import Label from "./select-label.svelte";
+import Portal from "./select-portal.svelte";
+import ScrollDownButton from "./select-scroll-down-button.svelte";
+import ScrollUpButton from "./select-scroll-up-button.svelte";
+import Separator from "./select-separator.svelte";
+import Trigger from "./select-trigger.svelte";
+import Value from "./select-value.svelte";
+import Root from "./select.svelte";
+
+export {
+	Root,
+	Group,
+	Label,
+	Item,
+	Content,
+	Trigger,
+	Separator,
+	ScrollDownButton,
+	ScrollUpButton,
+	GroupHeading,
+	Portal,
+	Value,
+	//
+	Root as Select,
+	Group as SelectGroup,
+	Label as SelectLabel,
+	Item as SelectItem,
+	Content as SelectContent,
+	Trigger as SelectTrigger,
+	Separator as SelectSeparator,
+	ScrollDownButton as SelectScrollDownButton,
+	ScrollUpButton as SelectScrollUpButton,
+	GroupHeading as SelectGroupHeading,
+	Portal as SelectPortal,
+	Value as SelectValue,
+};
diff --git a/frontend/src/lib/components/ui/select/select-content.svelte b/frontend/src/lib/components/ui/select/select-content.svelte
new file mode 100644
index 0000000..3ec8408
--- /dev/null
+++ b/frontend/src/lib/components/ui/select/select-content.svelte
@@ -0,0 +1,45 @@
+<script lang="ts">
+	import { Select as SelectPrimitive } from "bits-ui";
+	import { cn, type WithoutChild } from "$lib/utils.js";
+	import type { WithoutChildrenOrChild } from "$lib/utils.js";
+	import SelectPortal from "./select-portal.svelte";
+	import SelectScrollDownButton from "./select-scroll-down-button.svelte";
+	import SelectScrollUpButton from "./select-scroll-up-button.svelte";
+	import type { ComponentProps } from "svelte";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		sideOffset = 4,
+		portalProps,
+		children,
+		preventScroll = true,
+		...restProps
+	}: WithoutChild<SelectPrimitive.ContentProps> & {
+		portalProps?: WithoutChildrenOrChild<ComponentProps<typeof SelectPortal>>;
+	} = $props();
+</script>
+
+<SelectPortal {...portalProps}>
+	<SelectPrimitive.Content
+		bind:ref
+		{sideOffset}
+		{preventScroll}
+		data-slot="select-content"
+		class={cn(
+			"bg-popover text-popover-foreground data-open:animate-in data-closed:animate-out data-closed:fade-out-0 data-open:fade-in-0 data-closed:zoom-out-95 data-open:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 ring-foreground/10 min-w-32 rounded-lg shadow-md ring-1 duration-100 relative z-50 max-h-(--bits-select-content-available-height) origin-(--bits-select-content-transform-origin) overflow-x-hidden overflow-y-auto",
+			className
+		)}
+		{...restProps}
+	>
+		<SelectScrollUpButton />
+		<SelectPrimitive.Viewport
+			class={cn(
+				"h-(--bits-select-anchor-height) w-full min-w-(--bits-select-anchor-width) scroll-my-1"
+			)}
+		>
+			{@render children?.()}
+		</SelectPrimitive.Viewport>
+		<SelectScrollDownButton />
+	</SelectPrimitive.Content>
+</SelectPortal>
diff --git a/frontend/src/lib/components/ui/select/select-group-heading.svelte b/frontend/src/lib/components/ui/select/select-group-heading.svelte
new file mode 100644
index 0000000..1fab5f0
--- /dev/null
+++ b/frontend/src/lib/components/ui/select/select-group-heading.svelte
@@ -0,0 +1,21 @@
+<script lang="ts">
+	import { Select as SelectPrimitive } from "bits-ui";
+	import { cn } from "$lib/utils.js";
+	import type { ComponentProps } from "svelte";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		children,
+		...restProps
+	}: ComponentProps<typeof SelectPrimitive.GroupHeading> = $props();
+</script>
+
+<SelectPrimitive.GroupHeading
+	bind:ref
+	data-slot="select-group-heading"
+	class={cn("text-muted-foreground px-2 py-1.5 text-xs", className)}
+	{...restProps}
+>
+	{@render children?.()}
+</SelectPrimitive.GroupHeading>
diff --git a/frontend/src/lib/components/ui/select/select-group.svelte b/frontend/src/lib/components/ui/select/select-group.svelte
new file mode 100644
index 0000000..f666cb2
--- /dev/null
+++ b/frontend/src/lib/components/ui/select/select-group.svelte
@@ -0,0 +1,17 @@
+<script lang="ts">
+	import { Select as SelectPrimitive } from "bits-ui";
+	import { cn } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: SelectPrimitive.GroupProps = $props();
+</script>
+
+<SelectPrimitive.Group
+	bind:ref
+	data-slot="select-group"
+	class={cn("scroll-my-1 p-1", className)}
+	{...restProps}
+/>
diff --git a/frontend/src/lib/components/ui/select/select-item.svelte b/frontend/src/lib/components/ui/select/select-item.svelte
new file mode 100644
index 0000000..446dfdc
--- /dev/null
+++ b/frontend/src/lib/components/ui/select/select-item.svelte
@@ -0,0 +1,42 @@
+<script lang="ts">
+	import { Select as SelectPrimitive } from "bits-ui";
+	import CheckIcon from '@lucide/svelte/icons/check';
+	import { cn, type WithoutChild } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		value,
+		label,
+		children: childrenProp,
+		...restProps
+	}: WithoutChild<SelectPrimitive.ItemProps> = $props();
+</script>
+
+<SelectPrimitive.Item
+	bind:ref
+	{value}
+	{label}
+	data-slot="select-item"
+	class={cn(
+		"focus:bg-accent focus:text-accent-foreground not-data-[variant=destructive]:focus:**:text-accent-foreground min-h-7 gap-2 rounded-md px-2 py-1 text-xs/relaxed [&_svg:not([class*='size-'])]:size-3.5 *:[span]:last:flex *:[span]:last:items-center *:[span]:last:gap-2 relative flex w-full cursor-default items-center outline-hidden select-none data-disabled:pointer-events-none data-disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:shrink-0",
+		"data-highlighted:bg-accent data-highlighted:text-accent-foreground",
+		className
+	)}
+	{...restProps}
+>
+	{#snippet children({ selected, highlighted })}
+		<span class="pointer-events-none absolute right-2 flex items-center justify-center">
+			{#if selected}
+				<CheckIcon class="pointer-events-none" />
+			{/if}
+		</span>
+		<span class="flex flex-1 gap-2 shrink-0 whitespace-nowrap">
+			{#if childrenProp}
+				{@render childrenProp({ selected, highlighted })}
+			{:else}
+				{label || value}
+			{/if}
+		</span>
+	{/snippet}
+</SelectPrimitive.Item>
diff --git a/frontend/src/lib/components/ui/select/select-label.svelte b/frontend/src/lib/components/ui/select/select-label.svelte
new file mode 100644
index 0000000..4696025
--- /dev/null
+++ b/frontend/src/lib/components/ui/select/select-label.svelte
@@ -0,0 +1,20 @@
+<script lang="ts">
+	import { cn, type WithElementRef } from "$lib/utils.js";
+	import type { HTMLAttributes } from "svelte/elements";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		children,
+		...restProps
+	}: WithElementRef<HTMLAttributes<HTMLDivElement>> & {} = $props();
+</script>
+
+<div
+	bind:this={ref}
+	data-slot="select-label"
+	class={cn("text-muted-foreground px-2 py-1.5 text-xs", className)}
+	{...restProps}
+>
+	{@render children?.()}
+</div>
diff --git a/frontend/src/lib/components/ui/select/select-portal.svelte b/frontend/src/lib/components/ui/select/select-portal.svelte
new file mode 100644
index 0000000..424bcdd
--- /dev/null
+++ b/frontend/src/lib/components/ui/select/select-portal.svelte
@@ -0,0 +1,7 @@
+<script lang="ts">
+	import { Select as SelectPrimitive } from "bits-ui";
+
+	let { ...restProps }: SelectPrimitive.PortalProps = $props();
+</script>
+
+<SelectPrimitive.Portal {...restProps} />
diff --git a/frontend/src/lib/components/ui/select/select-scroll-down-button.svelte b/frontend/src/lib/components/ui/select/select-scroll-down-button.svelte
new file mode 100644
index 0000000..7bc111e
--- /dev/null
+++ b/frontend/src/lib/components/ui/select/select-scroll-down-button.svelte
@@ -0,0 +1,20 @@
+<script lang="ts">
+	import { Select as SelectPrimitive } from "bits-ui";
+	import ChevronDownIcon from '@lucide/svelte/icons/chevron-down';
+	import { cn, type WithoutChildrenOrChild } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: WithoutChildrenOrChild<SelectPrimitive.ScrollDownButtonProps> = $props();
+</script>
+
+<SelectPrimitive.ScrollDownButton
+	bind:ref
+	data-slot="select-scroll-down-button"
+	class={cn("bg-popover z-10 flex cursor-default items-center justify-center py-1 [&_svg:not([class*='size-'])]:size-3.5", className)}
+	{...restProps}
+>
+	<ChevronDownIcon  />
+</SelectPrimitive.ScrollDownButton>
diff --git a/frontend/src/lib/components/ui/select/select-scroll-up-button.svelte b/frontend/src/lib/components/ui/select/select-scroll-up-button.svelte
new file mode 100644
index 0000000..6c066ff
--- /dev/null
+++ b/frontend/src/lib/components/ui/select/select-scroll-up-button.svelte
@@ -0,0 +1,20 @@
+<script lang="ts">
+	import { Select as SelectPrimitive } from "bits-ui";
+	import ChevronUpIcon from '@lucide/svelte/icons/chevron-up';
+	import { cn, type WithoutChildrenOrChild } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: WithoutChildrenOrChild<SelectPrimitive.ScrollUpButtonProps> = $props();
+</script>
+
+<SelectPrimitive.ScrollUpButton
+	bind:ref
+	data-slot="select-scroll-up-button"
+	class={cn("bg-popover z-10 flex cursor-default items-center justify-center py-1 [&_svg:not([class*='size-'])]:size-3.5", className)}
+	{...restProps}
+>
+	<ChevronUpIcon  />
+</SelectPrimitive.ScrollUpButton>
diff --git a/frontend/src/lib/components/ui/select/select-separator.svelte b/frontend/src/lib/components/ui/select/select-separator.svelte
new file mode 100644
index 0000000..aac5ca3
--- /dev/null
+++ b/frontend/src/lib/components/ui/select/select-separator.svelte
@@ -0,0 +1,18 @@
+<script lang="ts">
+	import { Separator } from "$lib/components/ui/separator/index.js";
+	import { cn } from "$lib/utils.js";
+	import type { Separator as SeparatorPrimitive } from "bits-ui";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: SeparatorPrimitive.RootProps = $props();
+</script>
+
+<Separator
+	bind:ref
+	data-slot="select-separator"
+	class={cn("bg-border/50 -mx-1 my-1 h-px pointer-events-none", className)}
+	{...restProps}
+/>
diff --git a/frontend/src/lib/components/ui/select/select-trigger.svelte b/frontend/src/lib/components/ui/select/select-trigger.svelte
new file mode 100644
index 0000000..3acff3b
--- /dev/null
+++ b/frontend/src/lib/components/ui/select/select-trigger.svelte
@@ -0,0 +1,29 @@
+<script lang="ts">
+	import { Select as SelectPrimitive } from "bits-ui";
+	import ChevronDownIcon from '@lucide/svelte/icons/chevron-down';
+	import { cn, type WithoutChild } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		children,
+		size = "default",
+		...restProps
+	}: WithoutChild<SelectPrimitive.TriggerProps> & {
+		size?: "sm" | "default";
+	} = $props();
+</script>
+
+<SelectPrimitive.Trigger
+	bind:ref
+	data-slot="select-trigger"
+	data-size={size}
+	class={cn(
+		"border-input data-placeholder:text-muted-foreground bg-input/20 dark:bg-input/30 dark:hover:bg-input/50 focus-visible:border-ring focus-visible:ring-ring/30 aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive dark:aria-invalid:border-destructive/50 gap-1.5 rounded-md border px-2 py-1.5 text-xs/relaxed transition-colors focus-visible:ring-2 aria-invalid:ring-2 data-[size=default]:h-7 data-[size=sm]:h-6 *:data-[slot=select-value]:flex *:data-[slot=select-value]:gap-1.5 [&_svg:not([class*='size-'])]:size-3.5 flex w-fit items-center justify-between whitespace-nowrap outline-none disabled:cursor-not-allowed disabled:opacity-50 *:data-[slot=select-value]:line-clamp-1 *:data-[slot=select-value]:flex *:data-[slot=select-value]:items-center [&_svg]:pointer-events-none [&_svg]:shrink-0",
+		className
+	)}
+	{...restProps}
+>
+	{@render children?.()}
+	<ChevronDownIcon class="text-muted-foreground size-3.5 pointer-events-none" />
+</SelectPrimitive.Trigger>
diff --git a/frontend/src/lib/components/ui/select/select-value.svelte b/frontend/src/lib/components/ui/select/select-value.svelte
new file mode 100644
index 0000000..ff34b0e
--- /dev/null
+++ b/frontend/src/lib/components/ui/select/select-value.svelte
@@ -0,0 +1,7 @@
+<script lang="ts">
+	import { Select as SelectPrimitive } from "bits-ui";
+
+	let { ref = $bindable(null), ...restProps }: SelectPrimitive.ValueProps = $props();
+</script>
+
+<SelectPrimitive.Value bind:ref data-slot="select-value" {...restProps} />
diff --git a/frontend/src/lib/components/ui/select/select.svelte b/frontend/src/lib/components/ui/select/select.svelte
new file mode 100644
index 0000000..05eb663
--- /dev/null
+++ b/frontend/src/lib/components/ui/select/select.svelte
@@ -0,0 +1,11 @@
+<script lang="ts">
+	import { Select as SelectPrimitive } from "bits-ui";
+
+	let {
+		open = $bindable(false),
+		value = $bindable(),
+		...restProps
+	}: SelectPrimitive.RootProps = $props();
+</script>
+
+<SelectPrimitive.Root bind:open bind:value={value as never} {...restProps} />