feat: Phase 1B — DocumentCard/TagPill/FormatIcon 컴포넌트

- DocumentCard: 포맷 아이콘, 제목+요약, domain 경로, 태그 pill,
  data_origin 배지, 날짜, 파일 크기
- TagPill: 계층별 색상 (@amber, #blue, $green, !red), 클릭→필터
- FormatIcon: 파일 포맷별 lucide 아이콘 매핑
- documents 페이지에서 DocumentCard 컴포넌트 사용

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/lib/components/DocumentCard.svelte

@@ -0,0 +1,79 @@
+<script>
+  import FormatIcon from './FormatIcon.svelte';
+  import TagPill from './TagPill.svelte';
+
+  let { doc, showDomain = true } = $props();
+
+  function formatDate(dateStr) {
+    if (!dateStr) return '';
+    const d = new Date(dateStr);
+    const now = new Date();
+    const diff = now - d;
+    if (diff < 86400000) return '오늘';
+    if (diff < 172800000) return '어제';
+    if (diff < 604800000) return `${Math.floor(diff / 86400000)}일 전`;
+    return d.toLocaleDateString('ko-KR', { month: 'short', day: 'numeric' });
+  }
+
+  function formatSize(bytes) {
+    if (!bytes) return '';
+    if (bytes < 1024) return `${bytes}B`;
+    if (bytes < 1048576) return `${(bytes / 1024).toFixed(0)}KB`;
+    return `${(bytes / 1048576).toFixed(1)}MB`;
+  }
+</script>
+
+<a
+  href="/documents/{doc.id}"
+  class="flex items-start gap-3 p-3 bg-[var(--surface)] border border-[var(--border)] rounded-lg hover:border-[var(--accent)] transition-colors group"
+>
+  <!-- 포맷 아이콘 -->
+  <div class="shrink-0 mt-0.5 text-[var(--text-dim)] group-hover:text-[var(--accent)]">
+    <FormatIcon format={doc.file_format} size={18} />
+  </div>
+
+  <!-- 메인 콘텐츠 -->
+  <div class="flex-1 min-w-0">
+    <!-- 제목 -->
+    <p class="text-sm font-medium truncate group-hover:text-[var(--accent)]">
+      {doc.title || '제목 없음'}
+    </p>
+
+    <!-- AI 요약 -->
+    {#if doc.ai_summary}
+      <p class="text-xs text-[var(--text-dim)] truncate mt-0.5">{doc.ai_summary.slice(0, 100)}</p>
+    {/if}
+
+    <!-- 메타 행: domain 경로 + 태그 -->
+    <div class="flex items-center gap-2 mt-1.5 flex-wrap">
+      {#if showDomain && doc.ai_domain}
+        <span class="text-[10px] text-[var(--text-dim)]">
+          {doc.ai_domain.replace('Knowledge/', '')}{doc.ai_sub_group ? ` / ${doc.ai_sub_group}` : ''}
+        </span>
+      {/if}
+      {#if doc.ai_tags?.length}
+        <div class="flex gap-1">
+          {#each doc.ai_tags.slice(0, 3) as tag}
+            <TagPill {tag} />
+          {/each}
+        </div>
+      {/if}
+    </div>
+  </div>
+
+  <!-- 우측 메타 -->
+  <div class="shrink-0 flex flex-col items-end gap-1 text-[10px]">
+    {#if doc.score !== undefined}
+      <span class="text-[var(--accent)] font-medium">{(doc.score * 100).toFixed(0)}%</span>
+    {/if}
+    {#if doc.data_origin}
+      <span class="px-1.5 py-0.5 rounded {doc.data_origin === 'work' ? 'bg-blue-900/30 text-blue-400' : 'bg-gray-800 text-gray-400'}">
+        {doc.data_origin}
+      </span>
+    {/if}
+    <span class="text-[var(--text-dim)]">{formatDate(doc.created_at)}</span>
+    {#if doc.file_size}
+      <span class="text-[var(--text-dim)]">{formatSize(doc.file_size)}</span>
+    {/if}
+  </div>
+</a>

frontend/src/lib/components/FormatIcon.svelte

@@ -0,0 +1,30 @@
+<script>
+  import { FileText, File, Image, FileSpreadsheet, Presentation, Mail, FileCode, FileQuestion } from 'lucide-svelte';
+
+  let { format = '', size = 16 } = $props();
+
+  const ICON_MAP = {
+    pdf: FileText,
+    hwp: FileText,
+    hwpx: FileText,
+    md: FileCode,
+    txt: File,
+    csv: FileSpreadsheet,
+    json: FileCode,
+    xml: FileCode,
+    html: FileCode,
+    jpg: Image,
+    jpeg: Image,
+    png: Image,
+    gif: Image,
+    bmp: Image,
+    tiff: Image,
+    eml: Mail,
+    odoc: FileText,
+    osheet: FileSpreadsheet,
+  };
+
+  let Icon = $derived(ICON_MAP[format?.toLowerCase()] || FileQuestion);
+</script>
+
+<svelte:component this={Icon} {size} />

frontend/src/lib/components/TagPill.svelte

@@ -0,0 +1,40 @@
+<script>
+  import { goto } from '$app/navigation';
+  import { page } from '$app/stores';
+
+  let { tag = '', clickable = true } = $props();
+
+  // 계층별 색상
+  function getColor(t) {
+    if (t.startsWith('@상태/') || t.startsWith('@')) return { bg: 'bg-amber-900/30', text: 'text-amber-400' };
+    if (t.startsWith('#주제/') || t.startsWith('#')) return { bg: 'bg-blue-900/30', text: 'text-blue-400' };
+    if (t.startsWith('$유형/') || t.startsWith('$')) return { bg: 'bg-emerald-900/30', text: 'text-emerald-400' };
+    if (t.startsWith('!우선순위/') || t.startsWith('!')) return { bg: 'bg-red-900/30', text: 'text-red-400' };
+    return { bg: 'bg-[var(--border)]', text: 'text-[var(--text-dim)]' };
+  }
+
+  function handleClick(e) {
+    if (!clickable) return;
+    e.preventDefault();
+    e.stopPropagation();
+    const params = new URLSearchParams($page.url.searchParams);
+    params.set('tag', tag);
+    params.delete('page');
+    goto(`/documents?${params}`, { noScroll: true });
+  }
+
+  let color = $derived(getColor(tag));
+</script>
+
+{#if clickable}
+  <button
+    onclick={handleClick}
+    class="inline-flex text-[10px] px-1.5 py-0.5 rounded {color.bg} {color.text} hover:opacity-80 transition-opacity"
+  >
+    {tag}
+  </button>
+{:else}
+  <span class="inline-flex text-[10px] px-1.5 py-0.5 rounded {color.bg} {color.text}">
+    {tag}
+  </span>
+{/if}

frontend/src/routes/documents/+page.svelte

@@ -3,6 +3,7 @@
   import { goto } from '$app/navigation';
   import { api } from '$lib/api';
   import { addToast } from '$lib/stores/ui';
+  import DocumentCard from '$lib/components/DocumentCard.svelte';
 
   let documents = $state([]);
   let total = $state(0);
@@ -182,36 +183,7 @@
   {:else}
     <div class="space-y-1.5">
       {#each items as doc}
-        <a
+        <DocumentCard {doc} showDomain={!filterDomain} />
-          href="/documents/{doc.id}"
-          class="flex items-center justify-between p-3 bg-[var(--surface)] border border-[var(--border)] rounded-lg hover:border-[var(--accent)] transition-colors group"
-        >
-          <div class="flex items-center gap-3 min-w-0">
-            <span class="text-[10px] px-1.5 py-0.5 rounded bg-[var(--border)] text-[var(--text-dim)] uppercase shrink-0 font-mono">{doc.file_format}</span>
-            <div class="min-w-0">
-              <p class="text-sm font-medium truncate group-hover:text-[var(--accent)]">{doc.title || '제목 없음'}</p>
-              <div class="flex items-center gap-2 mt-0.5">
-                {#if doc.ai_domain}
-                  <span class="text-[10px] text-[var(--text-dim)]">{doc.ai_domain.replace('Knowledge/', '')}{doc.ai_sub_group ? ` / ${doc.ai_sub_group}` : ''}</span>
-                {/if}
-                {#if doc.ai_summary}
-                  <span class="text-[10px] text-[var(--text-dim)] truncate max-w-xs hidden sm:inline">· {doc.ai_summary?.slice(0, 80)}</span>
-                {/if}
-              </div>
-            </div>
-          </div>
-          <div class="flex items-center gap-2 shrink-0 ml-3">
-            {#if doc.ai_tags?.length}
-              <span class="text-[10px] text-[var(--accent)] hidden md:inline">{doc.ai_tags[0]}</span>
-            {/if}
-            {#if doc.score !== undefined}
-              <span class="text-[10px] text-[var(--accent)]">{(doc.score * 100).toFixed(0)}%</span>
-            {/if}
-            {#if doc.data_origin}
-              <span class="text-[10px] px-1.5 py-0.5 rounded {doc.data_origin === 'work' ? 'bg-blue-900/30 text-blue-400' : 'bg-gray-800 text-gray-400'}">{doc.data_origin}</span>
-            {/if}
-          </div>
-        </a>
       {/each}
     </div>