Frame with collapsible panels

<!--
  Расхождение с апстримом: `IconPlaceholder` заменена инлайновым `<svg>`
  (lucide-react v0.545.0 "chevron-right") — см. docs/PORTING.md §5.
-->
<script setup lang="ts">
import { Frame, FrameHeader, FramePanel, FrameTitle } from "@/components/reui/frame"
import { Collapsible, CollapsibleContent, CollapsibleTrigger } from "@/components/ui/collapsible"
</script>

<template>
  <Frame class="w-full" stacked>
    <Collapsible default-open class="group/collapsible">
      <CollapsibleTrigger class="w-full">
        <FrameHeader class="flex grow flex-row items-center justify-between gap-2">
          <FrameTitle>Start</FrameTitle>
          <svg
            xmlns="http://www.w3.org/2000/svg"
            width="24"
            height="24"
            viewBox="0 0 24 24"
            fill="none"
            stroke="currentColor"
            stroke-width="2"
            stroke-linecap="round"
            stroke-linejoin="round"
            aria-hidden="true"
            class="lucide lucide-chevron-right text-muted-foreground size-4 transition-transform duration-200 group-data-[state=open]/collapsible:rotate-90"
          ><path d="m9 18 6-6-6-6" /></svg>
        </FrameHeader>
      </CollapsibleTrigger>
      <CollapsibleContent>
        <FramePanel>
          <p class="text-muted-foreground text-sm">
            Initialize run to answer a user question using uploaded files and
            the knowledge base; cite sources when relevant.
          </p>
        </FramePanel>
      </CollapsibleContent>
    </Collapsible>
  </Frame>
</template>