feat(ui): add shadcn-vue Select components (#8205)

## Summary

Adds shadcn-vue Select components built on Reka UI primitives with
design system styling.

## Changes

**New Components** (`src/components/ui/select/`):
- `Select.vue` - Root wrapper using `SelectRoot` from Reka UI
- `SelectTrigger.vue` - Styled trigger with chevron icon
- `SelectContent.vue` - Dropdown content with scroll buttons, z-index
3000 for PrimeVue dialog compatibility
- `SelectItem.vue` - Individual option with check icon
- `SelectGroup.vue`, `SelectLabel.vue`, `SelectSeparator.vue` - Grouping
support
- `SelectScrollUpButton.vue`, `SelectScrollDownButton.vue` - Overflow
navigation
- `SelectValue.vue` - Placeholder/value display

**Styling**:
- Uses design tokens (`bg-secondary-background`,
`text-muted-foreground`, `border-border-default`)
- Iconify icons via `icon-[lucide--*]` classes
- Smooth transitions and focus states

**Documentation**:
- Comprehensive Storybook stories covering all variants
- `AGENTS.md` with component creation guidelines

## Testing

- [x] Storybook stories work correctly
- [x] Components build without errors

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8205-feat-ui-add-shadcn-vue-Select-components-2ef6d73d365081fd994ddb1123c063e7)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Amp <amp@ampcode.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

src/components/ui/AGENTS.md

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+# UI Component Guidelines
+
+## Adding New Components
+
+```bash
+pnpm dlx shadcn-vue@latest add <component-name> --yes
+```
+
+After adding, create `ComponentName.stories.ts` with Default, Disabled, and variant stories.
+
+## Reka UI Wrapper Components
+
+- Use reactive props destructuring with rest: `const { class: className, ...restProps } = defineProps<Props>()`
+- Use `useForwardProps(restProps)` for prop forwarding, or `computed()` if adding defaults
+- Import siblings directly (`./Component.vue`), not from barrel (`'.'`)
+- Use `cn()` for class merging with `className`
+- Use Iconify icons: `<i class="icon-[lucide--check]" />`
+- Use design tokens: `bg-secondary-background`, `text-muted-foreground`, `border-border-default`
+- Tailwind 4 CSS variables use parentheses: `h-(--my-var)` not `h-[--my-var]`

src/components/ui/select/Select.stories.ts

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+import type { Meta, StoryObj } from '@storybook/vue3-vite'
+import { ref } from 'vue'
+
+import Select from './Select.vue'
+import SelectContent from './SelectContent.vue'
+import SelectGroup from './SelectGroup.vue'
+import SelectItem from './SelectItem.vue'
+import SelectLabel from './SelectLabel.vue'
+import SelectSeparator from './SelectSeparator.vue'
+import SelectTrigger from './SelectTrigger.vue'
+import SelectValue from './SelectValue.vue'
+
+const meta = {
+  title: 'Components/Select',
+  component: Select,
+  tags: ['autodocs'],
+  argTypes: {
+    modelValue: {
+      control: 'text',
+      description: 'Selected value'
+    },
+    disabled: {
+      control: 'boolean',
+      description: 'When true, disables the select'
+    },
+    'onUpdate:modelValue': { action: 'update:modelValue' }
+  }
+} satisfies Meta<typeof Select>
+
+export default meta
+type Story = StoryObj<typeof meta>
+
+export const Default: Story = {
+  render: (args) => ({
+    components: {
+      Select,
+      SelectContent,
+      SelectItem,
+      SelectTrigger,
+      SelectValue
+    },
+    setup() {
+      const value = ref(args.modelValue || '')
+      return { value, args }
+    },
+    template: `
+      <Select v-model="value" :disabled="args.disabled">
+        <SelectTrigger class="w-56">
+          <SelectValue placeholder="Select a fruit" />
+        </SelectTrigger>
+        <SelectContent>
+          <SelectItem value="apple">Apple</SelectItem>
+          <SelectItem value="banana">Banana</SelectItem>
+          <SelectItem value="cherry">Cherry</SelectItem>
+          <SelectItem value="grape">Grape</SelectItem>
+          <SelectItem value="orange">Orange</SelectItem>
+        </SelectContent>
+      </Select>
+      <div class="mt-4 text-sm text-muted-foreground">
+        Selected: {{ value || 'None' }}
+      </div>
+    `
+  }),
+  args: {
+    disabled: false
+  }
+}
+
+export const WithPlaceholder: Story = {
+  render: (args) => ({
+    components: {
+      Select,
+      SelectContent,
+      SelectItem,
+      SelectTrigger,
+      SelectValue
+    },
+    setup() {
+      const value = ref('')
+      return { value, args }
+    },
+    template: `
+      <Select v-model="value" :disabled="args.disabled">
+        <SelectTrigger class="w-56">
+          <SelectValue placeholder="Choose an option..." />
+        </SelectTrigger>
+        <SelectContent>
+          <SelectItem value="option1">Option 1</SelectItem>
+          <SelectItem value="option2">Option 2</SelectItem>
+          <SelectItem value="option3">Option 3</SelectItem>
+        </SelectContent>
+      </Select>
+    `
+  }),
+  args: {
+    disabled: false
+  }
+}
+
+export const Disabled: Story = {
+  render: (args) => ({
+    components: {
+      Select,
+      SelectContent,
+      SelectItem,
+      SelectTrigger,
+      SelectValue
+    },
+    setup() {
+      const value = ref('apple')
+      return { value, args }
+    },
+    template: `
+      <Select v-model="value" disabled>
+        <SelectTrigger class="w-56">
+          <SelectValue placeholder="Select a fruit" />
+        </SelectTrigger>
+        <SelectContent>
+          <SelectItem value="apple">Apple</SelectItem>
+          <SelectItem value="banana">Banana</SelectItem>
+          <SelectItem value="cherry">Cherry</SelectItem>
+        </SelectContent>
+      </Select>
+    `
+  })
+}
+
+export const WithGroups: Story = {
+  render: (args) => ({
+    components: {
+      Select,
+      SelectContent,
+      SelectGroup,
+      SelectItem,
+      SelectLabel,
+      SelectSeparator,
+      SelectTrigger,
+      SelectValue
+    },
+    setup() {
+      const value = ref('')
+      return { value, args }
+    },
+    template: `
+      <Select v-model="value" :disabled="args.disabled">
+        <SelectTrigger class="w-56">
+          <SelectValue placeholder="Select a model type" />
+        </SelectTrigger>
+        <SelectContent>
+          <SelectGroup>
+            <SelectLabel>Checkpoints</SelectLabel>
+            <SelectItem value="sd15">SD 1.5</SelectItem>
+            <SelectItem value="sdxl">SDXL</SelectItem>
+            <SelectItem value="flux">Flux</SelectItem>
+          </SelectGroup>
+          <SelectSeparator />
+          <SelectGroup>
+            <SelectLabel>LoRAs</SelectLabel>
+            <SelectItem value="lora-style">Style LoRA</SelectItem>
+            <SelectItem value="lora-character">Character LoRA</SelectItem>
+          </SelectGroup>
+          <SelectSeparator />
+          <SelectGroup>
+            <SelectLabel>Other</SelectLabel>
+            <SelectItem value="vae">VAE</SelectItem>
+            <SelectItem value="embedding">Embedding</SelectItem>
+          </SelectGroup>
+        </SelectContent>
+      </Select>
+      <div class="mt-4 text-sm text-muted-foreground">
+        Selected: {{ value || 'None' }}
+      </div>
+    `
+  }),
+  args: {
+    disabled: false
+  }
+}
+
+export const Scrollable: Story = {
+  render: (args) => ({
+    components: {
+      Select,
+      SelectContent,
+      SelectItem,
+      SelectTrigger,
+      SelectValue
+    },
+    setup() {
+      const value = ref('')
+      const items = Array.from({ length: 20 }, (_, i) => ({
+        value: `item-${i + 1}`,
+        label: `Option ${i + 1}`
+      }))
+      return { value, items, args }
+    },
+    template: `
+      <Select v-model="value" :disabled="args.disabled">
+        <SelectTrigger class="w-56">
+          <SelectValue placeholder="Select an option" />
+        </SelectTrigger>
+        <SelectContent>
+          <SelectItem
+            v-for="item in items"
+            :key="item.value"
+            :value="item.value"
+          >
+            {{ item.label }}
+          </SelectItem>
+        </SelectContent>
+      </Select>
+    `
+  }),
+  args: {
+    disabled: false
+  }
+}
+
+export const CustomWidth: Story = {
+  render: (args) => ({
+    components: {
+      Select,
+      SelectContent,
+      SelectItem,
+      SelectTrigger,
+      SelectValue
+    },
+    setup() {
+      const value = ref('')
+      return { value, args }
+    },
+    template: `
+      <div class="space-y-4">
+        <Select v-model="value" :disabled="args.disabled">
+          <SelectTrigger class="w-32">
+            <SelectValue placeholder="Small" />
+          </SelectTrigger>
+          <SelectContent>
+            <SelectItem value="a">A</SelectItem>
+            <SelectItem value="b">B</SelectItem>
+            <SelectItem value="c">C</SelectItem>
+          </SelectContent>
+        </Select>
+
+        <Select v-model="value" :disabled="args.disabled">
+          <SelectTrigger class="w-full">
+            <SelectValue placeholder="Full width select" />
+          </SelectTrigger>
+          <SelectContent>
+            <SelectItem value="option1">Option 1</SelectItem>
+            <SelectItem value="option2">Option 2</SelectItem>
+            <SelectItem value="option3">Option 3</SelectItem>
+          </SelectContent>
+        </Select>
+      </div>
+    `
+  }),
+  args: {
+    disabled: false
+  }
+}

src/components/ui/select/Select.vue

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+<script setup lang="ts">
+import type { SelectRootEmits, SelectRootProps } from 'reka-ui'
+import { SelectRoot, useForwardPropsEmits } from 'reka-ui'
+
+// eslint-disable-next-line vue/no-unused-properties
+const props = defineProps<SelectRootProps>()
+const emits = defineEmits<SelectRootEmits>()
+
+const forwarded = useForwardPropsEmits(props, emits)
+</script>
+
+<template>
+  <SelectRoot v-bind="forwarded">
+    <slot />
+  </SelectRoot>
+</template>

src/components/ui/select/SelectContent.vue

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+<script setup lang="ts">
+import type { SelectContentEmits, SelectContentProps } from 'reka-ui'
+import {
+  SelectContent,
+  SelectPortal,
+  SelectViewport,
+  useForwardPropsEmits
+} from 'reka-ui'
+import type { HTMLAttributes } from 'vue'
+import { computed } from 'vue'
+
+import { cn } from '@/utils/tailwindUtil'
+
+import SelectScrollDownButton from './SelectScrollDownButton.vue'
+import SelectScrollUpButton from './SelectScrollUpButton.vue'
+
+defineOptions({
+  inheritAttrs: false
+})
+
+const {
+  position = 'popper',
+  class: className,
+  ...restProps
+} = defineProps<SelectContentProps & { class?: HTMLAttributes['class'] }>()
+const emits = defineEmits<SelectContentEmits>()
+
+const delegatedProps = computed(() => ({
+  position,
+  ...restProps
+}))
+
+const forwarded = useForwardPropsEmits(delegatedProps, emits)
+</script>
+
+<template>
+  <SelectPortal>
+    <SelectContent
+      v-bind="{ ...forwarded, ...$attrs }"
+      :class="
+        cn(
+          'relative z-3000 max-h-96 min-w-32 overflow-hidden',
+          'mt-2 rounded-lg p-2',
+          'bg-base-background text-base-foreground',
+          'border border-solid border-border-default',
+          'shadow-md',
+          'data-[state=open]:animate-in data-[state=closed]:animate-out',
+          'data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0',
+          'data-[state=closed]:zoom-out-95 data-[state=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',
+          position === 'popper' &&
+            'data-[side=bottom]:translate-y-1 data-[side=left]:-translate-x-1 data-[side=right]:translate-x-1 data-[side=top]:-translate-y-1',
+          className
+        )
+      "
+    >
+      <SelectScrollUpButton />
+      <SelectViewport
+        :class="
+          cn(
+            'scrollbar-custom flex flex-col gap-0',
+            position === 'popper' &&
+              'h-(--reka-select-trigger-height) w-full min-w-(--reka-select-trigger-width)'
+          )
+        "
+      >
+        <slot />
+      </SelectViewport>
+      <SelectScrollDownButton />
+    </SelectContent>
+  </SelectPortal>
+</template>

src/components/ui/select/SelectGroup.vue

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+<script setup lang="ts">
+import type { SelectGroupProps } from 'reka-ui'
+import { SelectGroup } from 'reka-ui'
+import type { HTMLAttributes } from 'vue'
+
+import { cn } from '@/utils/tailwindUtil'
+
+const { class: className, ...restProps } = defineProps<
+  SelectGroupProps & { class?: HTMLAttributes['class'] }
+>()
+</script>
+
+<template>
+  <SelectGroup :class="cn('w-full', className)" v-bind="restProps">
+    <slot />
+  </SelectGroup>
+</template>

src/components/ui/select/SelectItem.vue

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+<script setup lang="ts">
+import type { SelectItemProps } from 'reka-ui'
+import { SelectItem, SelectItemIndicator, SelectItemText } from 'reka-ui'
+import type { HTMLAttributes } from 'vue'
+
+import { cn } from '@/utils/tailwindUtil'
+
+const { class: className, ...restProps } = defineProps<
+  SelectItemProps & { class?: HTMLAttributes['class'] }
+>()
+</script>
+
+<template>
+  <SelectItem
+    v-bind="restProps"
+    :class="
+      cn(
+        'relative flex w-full cursor-pointer select-none items-center justify-between',
+        'gap-3 rounded px-2 py-3 text-sm outline-none',
+        'hover:bg-secondary-background-hover',
+        'focus:bg-secondary-background-hover',
+        'data-[state=checked]:bg-secondary-background-selected',
+        'data-[state=checked]:hover:bg-secondary-background-selected',
+        'data-[disabled]:pointer-events-none data-[disabled]:opacity-50',
+        className
+      )
+    "
+  >
+    <SelectItemText class="truncate">
+      <slot />
+    </SelectItemText>
+
+    <SelectItemIndicator class="flex shrink-0 items-center justify-center">
+      <i class="icon-[lucide--check] text-base-foreground" aria-hidden="true" />
+    </SelectItemIndicator>
+  </SelectItem>
+</template>

src/components/ui/select/SelectLabel.vue

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+<script setup lang="ts">
+import type { SelectLabelProps } from 'reka-ui'
+import { SelectLabel } from 'reka-ui'
+import type { HTMLAttributes } from 'vue'
+
+import { cn } from '@/utils/tailwindUtil'
+
+const { class: className, ...restProps } = defineProps<
+  SelectLabelProps & { class?: HTMLAttributes['class'] }
+>()
+</script>
+
+<template>
+  <SelectLabel
+    v-bind="restProps"
+    :class="
+      cn(
+        'px-3 py-2 text-xs uppercase tracking-wide text-muted-foreground',
+        className
+      )
+    "
+  >
+    <slot />
+  </SelectLabel>
+</template>

src/components/ui/select/SelectScrollDownButton.vue

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+<script setup lang="ts">
+import type { SelectScrollDownButtonProps } from 'reka-ui'
+import { SelectScrollDownButton } from 'reka-ui'
+import type { HTMLAttributes } from 'vue'
+
+import { cn } from '@/utils/tailwindUtil'
+
+const { class: className, ...restProps } = defineProps<
+  SelectScrollDownButtonProps & { class?: HTMLAttributes['class'] }
+>()
+</script>
+
+<template>
+  <SelectScrollDownButton
+    v-bind="restProps"
+    :class="
+      cn(
+        'flex cursor-default items-center justify-center py-1 text-muted-foreground',
+        className
+      )
+    "
+  >
+    <slot>
+      <i class="icon-[lucide--chevron-down]" />
+    </slot>
+  </SelectScrollDownButton>
+</template>

src/components/ui/select/SelectScrollUpButton.vue

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+<script setup lang="ts">
+import type { SelectScrollUpButtonProps } from 'reka-ui'
+import { SelectScrollUpButton } from 'reka-ui'
+import type { HTMLAttributes } from 'vue'
+
+import { cn } from '@/utils/tailwindUtil'
+
+const { class: className, ...restProps } = defineProps<
+  SelectScrollUpButtonProps & { class?: HTMLAttributes['class'] }
+>()
+</script>
+
+<template>
+  <SelectScrollUpButton
+    v-bind="restProps"
+    :class="
+      cn(
+        'flex cursor-default items-center justify-center py-1 text-muted-foreground',
+        className
+      )
+    "
+  >
+    <slot>
+      <i class="icon-[lucide--chevron-up]" />
+    </slot>
+  </SelectScrollUpButton>
+</template>

src/components/ui/select/SelectSeparator.vue

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+<script setup lang="ts">
+import type { SelectSeparatorProps } from 'reka-ui'
+import { SelectSeparator } from 'reka-ui'
+import type { HTMLAttributes } from 'vue'
+
+import { cn } from '@/utils/tailwindUtil'
+
+const { class: className, ...restProps } = defineProps<
+  SelectSeparatorProps & { class?: HTMLAttributes['class'] }
+>()
+</script>
+
+<template>
+  <SelectSeparator
+    v-bind="restProps"
+    :class="cn('-mx-1 my-1 h-px bg-border-default', className)"
+  />
+</template>

src/components/ui/select/SelectTrigger.vue

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+<script setup lang="ts">
+import type { SelectTriggerProps } from 'reka-ui'
+import { SelectIcon, SelectTrigger } from 'reka-ui'
+import type { HTMLAttributes } from 'vue'
+
+import { cn } from '@/utils/tailwindUtil'
+
+const { class: className, ...restProps } = defineProps<
+  SelectTriggerProps & { class?: HTMLAttributes['class'] }
+>()
+</script>
+
+<template>
+  <SelectTrigger
+    v-bind="restProps"
+    :class="
+      cn(
+        'flex h-10 w-full cursor-pointer select-none items-center justify-between',
+        'rounded-lg px-4 py-2 text-sm',
+        'bg-secondary-background text-base-foreground',
+        'border-[2.5px] border-solid border-transparent',
+        'transition-all duration-200 ease-in-out',
+        'focus:border-node-component-border focus:outline-none',
+        'data-[placeholder]:text-muted-foreground',
+        'disabled:cursor-not-allowed disabled:opacity-60',
+        '[&>span]:truncate',
+        className
+      )
+    "
+  >
+    <slot />
+    <SelectIcon as-child>
+      <i class="icon-[lucide--chevron-down] shrink-0 text-muted-foreground" />
+    </SelectIcon>
+  </SelectTrigger>
+</template>

src/components/ui/select/SelectValue.vue

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+<script setup lang="ts">
+import type { SelectValueProps } from 'reka-ui'
+import { SelectValue } from 'reka-ui'
+
+const props = defineProps<SelectValueProps>()
+</script>
+
+<template>
+  <SelectValue v-bind="props">
+    <slot />
+  </SelectValue>
+</template>