feat(ui): Phase C — 대시보드 위젯 그리드 + dashboardSummary 공유 fetch

- dashboardSummary store 구독으로 SystemStatusDot과 fetch 1회 공유 (60초 폴링)
- Svelte 5 runes + Card/EmptyState/Skeleton/FormatIcon 프리미티브
- 12-col 그리드 (sm 1열 / md 2열 / lg 표 그대로):
  * 행1: stat 4장 (전체/Inbox/법령/시스템 상태)
  * 행2: 파이프라인 가로 막대 차트(8) + 오늘 도메인 누적바(4)
  * 행3: 최근 문서(8) + CalDAV stub(4)
- 신규 util: domainSlug.ts — ai_domain → bg-domain-{slug} + 라벨 매핑
- 새 코드에 bg-[var(--*)] 0건 (lint:tokens 통과)

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

frontend/src/lib/utils/domainSlug.ts

@@ -0,0 +1,66 @@
+// ai_domain 값을 @theme의 bg-domain-{slug} 토큰 슬러그로 매핑.
+// 백엔드는 'Knowledge/Philosophy', 'Knowledge/Industrial_Safety', 'Reference', null
+// 형태를 모두 보낼 수 있으므로 leaf만 잘라 lowercase하고 industrial_safety→safety로 재매핑.
+//
+// Phase C: 대시보드 today_by_domain 누적바, recent_documents accent에서 사용.
+// 추후 phase에서도 도메인 색상 칩이 필요해지면 여기로 일원화.
+
+export type DomainSlug =
+  | 'philosophy'
+  | 'language'
+  | 'engineering'
+  | 'safety'
+  | 'programming'
+  | 'general'
+  | 'reference';
+
+const LEAF_TO_SLUG: Record<string, DomainSlug> = {
+  philosophy: 'philosophy',
+  language: 'language',
+  engineering: 'engineering',
+  industrial_safety: 'safety',
+  safety: 'safety',
+  programming: 'programming',
+  general: 'general',
+  reference: 'reference',
+};
+
+/** 'Knowledge/Philosophy' → 'philosophy', 'Reference' → 'reference', null → null */
+export function domainSlug(domain: string | null | undefined): DomainSlug | null {
+  if (!domain) return null;
+  const leaf = domain.includes('/') ? domain.split('/').pop()! : domain;
+  return LEAF_TO_SLUG[leaf.toLowerCase()] ?? null;
+}
+
+const SLUG_BG_CLASS: Record<DomainSlug, string> = {
+  philosophy: 'bg-domain-philosophy',
+  language: 'bg-domain-language',
+  engineering: 'bg-domain-engineering',
+  safety: 'bg-domain-safety',
+  programming: 'bg-domain-programming',
+  general: 'bg-domain-general',
+  reference: 'bg-domain-reference',
+};
+
+/** bg-domain-{slug} 클래스. 미지정/미매핑은 bg-default. */
+export function domainBgClass(domain: string | null | undefined): string {
+  const slug = domainSlug(domain);
+  return slug ? SLUG_BG_CLASS[slug] : 'bg-default';
+}
+
+const SLUG_LABEL: Record<DomainSlug, string> = {
+  philosophy: 'Philosophy',
+  language: 'Language',
+  engineering: 'Engineering',
+  safety: 'Industrial Safety',
+  programming: 'Programming',
+  general: 'General',
+  reference: 'Reference',
+};
+
+/** 표시용 라벨. domain이 null이면 '미분류'. */
+export function domainLabel(domain: string | null | undefined): string {
+  const slug = domainSlug(domain);
+  if (!slug) return domain ?? '미분류';
+  return SLUG_LABEL[slug];
+}

frontend/src/routes/+page.svelte

@@ -1,88 +1,396 @@
-<script>
-  import { onMount } from 'svelte';
-  import { goto } from '$app/navigation';
-  import { api } from '$lib/api';
-  import { addToast } from '$lib/stores/toast';
+<script lang="ts">
+  // 대시보드 — Phase C 재작성.
+  // - dashboardSummary store(system.ts)를 구독해 SystemStatusDot과 fetch 1회 공유.
+  // - 5대 위젯: stat 카드 4 / 파이프라인 차트 / 도메인 분포 / 최근 문서 / CalDAV stub.
+  // - grid-cols-12 (lg+), md 2열, sm 1열.
 
-  let dashboard = null;
-  let loading = true;
+  import {
+    dashboardSummary,
+    type DashboardSummary,
+    type DomainCount,
+    type PipelineStatus,
+  } from '$lib/stores/system';
+  import { domainBgClass, domainLabel } from '$lib/utils/domainSlug';
+  import Card from '$lib/components/ui/Card.svelte';
+  import EmptyState from '$lib/components/ui/EmptyState.svelte';
+  import Skeleton from '$lib/components/ui/Skeleton.svelte';
+  import FormatIcon from '$lib/components/FormatIcon.svelte';
+  import { Calendar, Inbox, Scale, FileText, Activity } from 'lucide-svelte';
 
-  onMount(async () => {
-    try {
-      dashboard = await api('/dashboard/');
-    } catch (err) {
-      addToast('error', '대시보드 로딩 실패');
-    } finally {
-      loading = false;
+  // ─── 파생 값들 ───────────────────────────────────────────────
+  // legacy store + runes 혼합: 템플릿에서 $dashboardSummary로 자동 구독.
+  let summary = $derived<DashboardSummary | null>($dashboardSummary);
+  let loading = $derived(summary === null);
+
+  // ── 파이프라인 차트 row 빌드 ──
+  // SystemStatusDot과 동일 규칙으로 stage별 pending/processing/failed 합산.
+  const STAGE_ORDER = ['extract', 'classify', 'embed', 'preview'] as const;
+  const STAGE_LABEL: Record<string, string> = {
+    extract: '추출',
+    classify: '분류',
+    embed: '임베딩',
+    preview: '미리보기',
+  };
+
+  interface PipelineRow {
+    stage: string;
+    label: string;
+    pending: number;
+    processing: number;
+    failed: number;
+    total: number;
+  }
+
+  function buildPipelineRows(items: PipelineStatus[]): PipelineRow[] {
+    const grouped = new Map<
+      string,
+      { pending: number; processing: number; failed: number }
+    >();
+    for (const it of items) {
+      const cur = grouped.get(it.stage) ?? { pending: 0, processing: 0, failed: 0 };
+      if (it.status === 'pending') cur.pending += it.count;
+      else if (it.status === 'processing') cur.processing += it.count;
+      else if (it.status === 'failed') cur.failed += it.count;
+      grouped.set(it.stage, cur);
     }
-  });
+    const orderedStages = [
+      ...STAGE_ORDER.filter((s) => grouped.has(s)),
+      ...[...grouped.keys()].filter((s) => !STAGE_ORDER.includes(s as never)),
+    ];
+    return orderedStages.map((stage) => {
+      const r = grouped.get(stage)!;
+      return {
+        stage,
+        label: STAGE_LABEL[stage] ?? stage,
+        ...r,
+        total: r.pending + r.processing + r.failed,
+      };
+    });
+  }
+
+  let pipelineRows = $derived<PipelineRow[]>(
+    summary ? buildPipelineRows(summary.pipeline_status) : []
+  );
+  // 모든 막대가 같은 스케일을 공유하도록 row 최대 total을 분모로.
+  let pipelineMax = $derived(
+    Math.max(1, ...pipelineRows.map((r) => r.total))
+  );
+
+  // ── 도메인 분포 row ──
+  interface DomainRow extends DomainCount {
+    pct: number;
+    bgClass: string;
+    label: string;
+  }
+  function buildDomainRows(items: DomainCount[]): {
+    rows: DomainRow[];
+    total: number;
+  } {
+    const total = items.reduce((s, i) => s + i.count, 0);
+    const rows = items
+      .filter((i) => i.count > 0)
+      .map((i) => ({
+        ...i,
+        pct: total > 0 ? (i.count / total) * 100 : 0,
+        bgClass: domainBgClass(i.domain),
+        label: domainLabel(i.domain),
+      }))
+      // 큰 것부터
+      .sort((a, b) => b.count - a.count);
+    return { rows, total };
+  }
+
+  let domainData = $derived(
+    summary
+      ? buildDomainRows(summary.today_by_domain)
+      : { rows: [], total: 0 }
+  );
+
+  // ── 시스템 상태 카드 표시값 ──
+  function pickSystemTone(s: DashboardSummary): {
+    label: string;
+    sub: string;
+    tone: 'success' | 'warning' | 'error';
+  } {
+    if (s.failed_count > 0) {
+      return { label: `${s.failed_count} 실패`, sub: '확인 필요', tone: 'error' };
+    }
+    const backlog = s.pipeline_status.some(
+      (p) => p.status === 'pending' && p.count > 10
+    );
+    if (backlog) {
+      return { label: '대기열 적체', sub: 'pending > 10', tone: 'warning' };
+    }
+    return { label: '정상', sub: '실패 없음', tone: 'success' };
+  }
+  const TONE_TEXT: Record<'success' | 'warning' | 'error', string> = {
+    success: 'text-success',
+    warning: 'text-warning',
+    error: 'text-error',
+  };
+
+  let systemView = $derived(summary ? pickSystemTone(summary) : null);
 </script>
 
 <div class="p-4 lg:p-6">
-  <div class="max-w-6xl mx-auto">
+  <div class="max-w-7xl mx-auto">
     <h2 class="text-xl font-bold mb-6">대시보드</h2>
 
     {#if loading}
-      <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-4">
+      <!-- 로딩 — stat 카드 4개 + 큰 위젯 자리 4개 -->
+      <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-12 gap-4">
         {#each Array(4) as _}
-          <div class="bg-[var(--surface)] rounded-xl p-5 border border-[var(--border)] animate-pulse h-28"></div>
-        {/each}
-      </div>
-    {:else if dashboard}
-      <!-- 위젯 그리드 -->
-      <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-4 mb-8">
-        <!-- 전체 문서 -->
-        <div class="bg-[var(--surface)] rounded-xl p-5 border border-[var(--border)]">
-          <p class="text-sm text-[var(--text-dim)]">전체 문서</p>
-          <p class="text-3xl font-bold mt-1">{dashboard.total_documents}</p>
-          <p class="text-xs text-[var(--text-dim)] mt-1">오늘 +{dashboard.today_added}</p>
-        </div>
-
-        <!-- Inbox -->
-        <div class="bg-[var(--surface)] rounded-xl p-5 border border-[var(--border)]">
-          <p class="text-sm text-[var(--text-dim)]">Inbox 미분류</p>
-          <p class="text-3xl font-bold mt-1" class:text-[var(--warning)]={dashboard.inbox_count > 0}>{dashboard.inbox_count}</p>
-          {#if dashboard.inbox_count > 0}
-            <a href="/inbox" class="text-xs text-[var(--accent)] hover:underline mt-1 inline-block">분류하기</a>
-          {/if}
-        </div>
-
-        <!-- 법령 알림 -->
-        <div class="bg-[var(--surface)] rounded-xl p-5 border border-[var(--border)]">
-          <p class="text-sm text-[var(--text-dim)]">법령 알림</p>
-          <p class="text-3xl font-bold mt-1">{dashboard.law_alerts}</p>
-          <p class="text-xs text-[var(--text-dim)] mt-1">오늘 변경</p>
-        </div>
-
-        <!-- 파이프라인 -->
-        <div class="bg-[var(--surface)] rounded-xl p-5 border border-[var(--border)]">
-          <p class="text-sm text-[var(--text-dim)]">파이프라인</p>
-          {#if dashboard.failed_count > 0}
-            <p class="text-3xl font-bold mt-1 text-[var(--error)]">{dashboard.failed_count} 실패</p>
-          {:else}
-            <p class="text-3xl font-bold mt-1 text-[var(--success)]">정상</p>
-          {/if}
-        </div>
-      </div>
-
-      <!-- 최근 문서 -->
-      <div class="bg-[var(--surface)] rounded-xl border border-[var(--border)] p-5">
-        <h3 class="text-sm font-semibold text-[var(--text-dim)] mb-3">최근 문서</h3>
-        {#if dashboard.recent_documents.length > 0}
-          <div class="space-y-2">
-            {#each dashboard.recent_documents as doc}
-              <a href="/documents/{doc.id}" class="flex items-center justify-between py-2 px-3 rounded-lg hover:bg-[var(--bg)] transition-colors">
-                <div class="flex items-center gap-3">
-                  <span class="text-xs px-2 py-0.5 rounded bg-[var(--border)] text-[var(--text-dim)] uppercase">{doc.file_format}</span>
-                  <span class="text-sm truncate max-w-md">{doc.title || '제목 없음'}</span>
-                </div>
-                <span class="text-xs text-[var(--text-dim)]">{doc.ai_domain || ''}</span>
-              </a>
-            {/each}
+          <div class="lg:col-span-3">
+            <Card>
+              <Skeleton w="w-20" h="h-3" />
+              <Skeleton w="w-16" h="h-8" class="mt-3" />
+              <Skeleton w="w-24" h="h-3" class="mt-2" />
+            </Card>
           </div>
-        {:else}
-          <p class="text-sm text-[var(--text-dim)]">문서가 없습니다</p>
-        {/if}
+        {/each}
+        <div class="lg:col-span-8">
+          <Card>
+            <Skeleton w="w-32" h="h-4" />
+            <Skeleton w="w-full" h="h-24" class="mt-4" />
+          </Card>
+        </div>
+        <div class="lg:col-span-4">
+          <Card>
+            <Skeleton w="w-32" h="h-4" />
+            <Skeleton w="w-full" h="h-24" class="mt-4" />
+          </Card>
+        </div>
+        <div class="lg:col-span-8">
+          <Card>
+            <Skeleton w="w-32" h="h-4" />
+            <Skeleton w="w-full" h="h-32" class="mt-4" />
+          </Card>
+        </div>
+        <div class="lg:col-span-4">
+          <Card>
+            <Skeleton w="w-32" h="h-4" />
+            <Skeleton w="w-full" h="h-32" class="mt-4" />
+          </Card>
+        </div>
+      </div>
+    {:else if summary}
+      <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-12 gap-4">
+        <!-- ─── 행 1: stat 4 ─── -->
+        <div class="lg:col-span-3">
+          <Card>
+            <div class="flex items-start justify-between">
+              <p class="text-sm text-dim">전체 문서</p>
+              <FileText size={18} class="text-faint" />
+            </div>
+            <p class="text-3xl font-bold mt-2 text-text">
+              {summary.total_documents.toLocaleString()}
+            </p>
+            <p class="text-xs text-dim mt-1">
+              오늘 +{summary.today_added}
+            </p>
+          </Card>
+        </div>
+
+        <div class="lg:col-span-3">
+          <Card>
+            <div class="flex items-start justify-between">
+              <p class="text-sm text-dim">Inbox 미분류</p>
+              <Inbox size={18} class="text-faint" />
+            </div>
+            <p
+              class="text-3xl font-bold mt-2 {summary.inbox_count > 0
+                ? 'text-warning'
+                : 'text-text'}"
+            >
+              {summary.inbox_count}
+            </p>
+            {#if summary.inbox_count > 0}
+              <a
+                href="/inbox"
+                class="text-xs text-accent hover:underline mt-1 inline-block"
+              >
+                분류하기 →
+              </a>
+            {:else}
+              <p class="text-xs text-dim mt-1">대기 없음</p>
+            {/if}
+          </Card>
+        </div>
+
+        <div class="lg:col-span-3">
+          <Card>
+            <div class="flex items-start justify-between">
+              <p class="text-sm text-dim">법령 알림</p>
+              <Scale size={18} class="text-faint" />
+            </div>
+            <p class="text-3xl font-bold mt-2 text-text">{summary.law_alerts}</p>
+            <p class="text-xs text-dim mt-1">오늘 변경</p>
+          </Card>
+        </div>
+
+        <div class="lg:col-span-3">
+          <Card>
+            <div class="flex items-start justify-between">
+              <p class="text-sm text-dim">시스템 상태</p>
+              <Activity size={18} class="text-faint" />
+            </div>
+            {#if systemView}
+              <p class="text-3xl font-bold mt-2 {TONE_TEXT[systemView.tone]}">
+                {systemView.label}
+              </p>
+              <p class="text-xs text-dim mt-1">{systemView.sub}</p>
+            {/if}
+          </Card>
+        </div>
+
+        <!-- ─── 행 2: 파이프라인 + 도메인 분포 ─── -->
+        <div class="lg:col-span-8">
+          <Card>
+            <div class="flex items-center justify-between mb-4">
+              <h3 class="text-sm font-semibold text-text">파이프라인 상태</h3>
+              <span class="text-xs text-dim">최근 24시간</span>
+            </div>
+            {#if pipelineRows.length > 0}
+              <div class="space-y-3">
+                {#each pipelineRows as row (row.stage)}
+                  <div>
+                    <div class="flex items-center justify-between text-xs mb-1.5">
+                      <span class="text-dim">{row.label}</span>
+                      <span class="text-dim tabular-nums">
+                        대기 <span class="text-text">{row.pending}</span> ·
+                        처리 <span class="text-text">{row.processing}</span> ·
+                        실패 <span class:text-error={row.failed > 0}>{row.failed}</span>
+                      </span>
+                    </div>
+                    <div
+                      class="flex h-2 w-full overflow-hidden rounded-sm bg-bg"
+                    >
+                      {#if row.pending > 0}
+                        <div
+                          class="bg-warning h-full"
+                          style="width: {(row.pending / pipelineMax) * 100}%"
+                        ></div>
+                      {/if}
+                      {#if row.processing > 0}
+                        <div
+                          class="bg-accent h-full"
+                          style="width: {(row.processing / pipelineMax) * 100}%"
+                        ></div>
+                      {/if}
+                      {#if row.failed > 0}
+                        <div
+                          class="bg-error h-full"
+                          style="width: {(row.failed / pipelineMax) * 100}%"
+                        ></div>
+                      {/if}
+                    </div>
+                  </div>
+                {/each}
+              </div>
+            {:else}
+              <EmptyState
+                icon={Activity}
+                title="처리 작업 없음"
+                description="최근 24시간 내 파이프라인 큐가 비어 있습니다."
+              />
+            {/if}
+          </Card>
+        </div>
+
+        <div class="lg:col-span-4">
+          <Card>
+            <div class="flex items-center justify-between mb-4">
+              <h3 class="text-sm font-semibold text-text">오늘 도메인 분포</h3>
+              <span class="text-xs text-dim tabular-nums">
+                {domainData.total}건
+              </span>
+            </div>
+            {#if domainData.rows.length > 0}
+              <!-- 누적 가로 바 -->
+              <div
+                class="flex h-2 w-full overflow-hidden rounded-sm bg-bg mb-3"
+              >
+                {#each domainData.rows as r (r.label)}
+                  <div
+                    class="{r.bgClass} h-full"
+                    style="width: {r.pct}%"
+                    title="{r.label} {r.count}건"
+                  ></div>
+                {/each}
+              </div>
+              <ul class="space-y-1.5">
+                {#each domainData.rows as r (r.label)}
+                  <li class="flex items-center justify-between text-xs">
+                    <span class="flex items-center gap-2">
+                      <span class="h-2 w-2 rounded-full {r.bgClass}"></span>
+                      <span class="text-text">{r.label}</span>
+                    </span>
+                    <span class="text-dim tabular-nums">{r.count}</span>
+                  </li>
+                {/each}
+              </ul>
+            {:else}
+              <EmptyState
+                title="오늘 추가된 문서 없음"
+                description="새로 분류된 문서가 도메인별로 여기에 표시됩니다."
+              />
+            {/if}
+          </Card>
+        </div>
+
+        <!-- ─── 행 3: 최근 문서 + CalDAV stub ─── -->
+        <div class="lg:col-span-8">
+          <Card>
+            <h3 class="text-sm font-semibold text-text mb-3">최근 문서</h3>
+            {#if summary.recent_documents.length > 0}
+              <ul class="space-y-1">
+                {#each summary.recent_documents as doc (doc.id)}
+                  <li>
+                    <a
+                      href="/documents/{doc.id}"
+                      class="flex items-center justify-between gap-3 py-2 px-2 -mx-2 rounded-md hover:bg-surface-hover transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent-ring"
+                    >
+                      <span class="flex items-center gap-3 min-w-0">
+                        <span
+                          class="h-1.5 w-1.5 rounded-full shrink-0 {domainBgClass(
+                            doc.ai_domain
+                          )}"
+                          aria-hidden="true"
+                        ></span>
+                        <span class="text-faint shrink-0">
+                          <FormatIcon format={doc.file_format} size={16} />
+                        </span>
+                        <span class="text-sm text-text truncate">
+                          {doc.title || '제목 없음'}
+                        </span>
+                      </span>
+                      <span class="text-xs text-dim shrink-0">
+                        {domainLabel(doc.ai_domain)}
+                      </span>
+                    </a>
+                  </li>
+                {/each}
+              </ul>
+            {:else}
+              <EmptyState
+                icon={FileText}
+                title="아직 문서가 없습니다"
+                description="NAS PKM 폴더에 파일을 추가하면 자동으로 인덱싱됩니다."
+              />
+            {/if}
+          </Card>
+        </div>
+
+        <div class="lg:col-span-4">
+          <Card>
+            <h3 class="text-sm font-semibold text-text mb-3">오늘의 할 일</h3>
+            <EmptyState
+              icon={Calendar}
+              title="Synology Calendar 연동 예정"
+              description="CalDAV 연동은 추후 추가됩니다."
+            />
+          </Card>
+        </div>
       </div>
     {/if}
   </div>