feat(web): FE overhaul — SWR centralized data layer + dashboard + islands

- Add SWR foundation (lib/fetcher, lib/swr, lib/api) with typed
  hooks: useSections/useDocuments/useSearch/useRelated/useRevisions/useQueueStatus
- Replace ad-hoc useEffect+fetch in Header/Sidebar/CommandMenu/search
  with SWR (dedup 4s, focus throttle 10s, debounced search 180ms)
- Doc page: RelatedGrid + RevisionList as SWR client islands (RSC hero stays)
- DocForm: SWR mutate on create/update for live sidebar invalidation
- New APIs: /api/related, /api/revisions, /api/tags, /api/queue/status,
  /api/docs filtering (?section=&status=)
- New UI: DocumentCard, SectionCard, SearchBar, TagCloud, QueueBadge,
  EmptyState, dashboard (/dashboard with QueueStrip live + section stats)
- Layout wraps SWRProvider; no TanStack code (SWR-only per spec)
- Verified: next build passes (16.3.4 Turbopack), no manual fetch sprawl remains

Co-Authored-By: internal-model

apps/web/app/api/revisions/route.ts

@@ -0,0 +1,21 @@
+import { NextRequest, NextResponse } from "next/server";
+import { listRevisions } from "@mcpedia/core";
+
+export const dynamic = "force-dynamic";
+
+// GET /api/revisions?slug=...&limit=10
+export async function GET(req: NextRequest) {
+  const { searchParams } = new URL(req.url);
+  const slug = searchParams.get("slug") ?? "";
+  const limit = Math.min(Math.max(Number(searchParams.get("limit") ?? 10), 1), 50);
+  if (!slug.trim()) {
+    return NextResponse.json({ revisions: [] });
+  }
+  try {
+    const revisions = await listRevisions(slug, limit);
+    return NextResponse.json({ revisions });
+  } catch (e) {
+    const msg = e instanceof Error ? e.message : String(e);
+    return NextResponse.json({ revisions: [], error: msg }, { status: 500 });
+  }
+}