feat: speed up admin clone import and enable Cache Components

- Clone import: defer FurnitureData.json writes and append all entries in a
  single batched write instead of one read-modify-write per item, removing
  the main serialization bottleneck for large batches.
- Clone import: raise SSE batch concurrency cap from 5 to 10 and bump the
  clone client/route default from 2 to 6.
- Add a flush hook to runSseBatch so callers can batch deferred work before
  batch_complete is emitted, and surface flush errors as an error event.
- Enable Next.js Cache Components (instant: false opt-out) and silence the
  related build warnings in next.config.ts.
- Switch isomorphic-dompurify to dompurify and refresh dependencies.

src/app/mod/actions/page.tsx

@@ -2,6 +2,10 @@ import { ModActionsClient } from "@/app/admin/moderation/actions/mod-actions-cli
 import { requireModPermission } from "@/lib/admin/guard";
 import { PERMS } from "@/lib/permissions";
 
+// TODO: Cache Components adoption. Refactor this route so this opt-out can be removed.
+// See: https://nextjs.org/docs/app/guides/migrating-to-cache-components
+export const instant = false;
+
 export default async function ModQuickActionsPage() {
 	await requireModPermission([PERMS.MOD_ACTIONS, PERMS.MODERATION_EDIT]);
 

src/app/mod/bans/page.tsx

@@ -7,6 +7,10 @@ import { Ban, db } from "@/lib/db";
 import { formatDate } from "@/lib/format-date";
 import { PERMS } from "@/lib/permissions";
 
+// TODO: Cache Components adoption. Refactor this route so this opt-out can be removed.
+// See: https://nextjs.org/docs/app/guides/migrating-to-cache-components
+export const instant = false;
+
 type BanRow = {
 	id: number;
 	userId: number;

src/app/mod/cfh/[id]/page.tsx

@@ -5,6 +5,10 @@ import { requireModPermission } from "@/lib/admin/guard";
 import { Ban, db, SupportTickets, User } from "@/lib/db";
 import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
 
+// TODO: Cache Components adoption. Refactor this route so this opt-out can be removed.
+// See: https://nextjs.org/docs/app/guides/migrating-to-cache-components
+export const instant = false;
+
 export default async function ModCfhDetailPage({
 	params,
 }: {

src/app/mod/cfh/page.tsx

@@ -16,6 +16,10 @@ import { calcPagination, parseListParams } from "@/lib/admin-helpers";
 import { db, SupportTickets, User } from "@/lib/db";
 import { PERMS } from "@/lib/permissions";
 
+// TODO: Cache Components adoption. Refactor this route so this opt-out can be removed.
+// See: https://nextjs.org/docs/app/guides/migrating-to-cache-components
+export const instant = false;
+
 const SORT_COLS = {
 	id: SupportTickets.id,
 	issue: SupportTickets.issue,

src/app/mod/help-tickets/[id]/page.tsx

@@ -15,6 +15,10 @@ import {
 } from "@/lib/db";
 import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
 
+// TODO: Cache Components adoption. Refactor this route so this opt-out can be removed.
+// See: https://nextjs.org/docs/app/guides/migrating-to-cache-components
+export const instant = false;
+
 export default async function ModHelpTicketDetailPage({
 	params,
 }: {

src/app/mod/help-tickets/page.tsx

@@ -28,6 +28,10 @@ import {
 import { formatDate } from "@/lib/format-date";
 import { PERMS } from "@/lib/permissions";
 
+// TODO: Cache Components adoption. Refactor this route so this opt-out can be removed.
+// See: https://nextjs.org/docs/app/guides/migrating-to-cache-components
+export const instant = false;
+
 const SORT_COLS = {
 	title: WebsiteHelpCenterTickets.title,
 	open: WebsiteHelpCenterTickets.open,

src/app/mod/layout.tsx

@@ -21,7 +21,9 @@ import { readCsrfCookieToken } from "@/lib/foundation/security";
 import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
 import { siteSettings } from "@/lib/services/site-settings";
 
-export const dynamic = "force-dynamic";
+// TODO: Cache Components adoption. Refactor this route so this opt-out can be removed.
+// See: https://nextjs.org/docs/app/guides/migrating-to-cache-components
+export const instant = false;
 
 export default async function ModLayout({ children }: { children: ReactNode }) {
 	const staff = await requireMod();

src/app/mod/page.tsx

@@ -22,6 +22,10 @@ import {
 } from "@/lib/db";
 import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
 
+// TODO: Cache Components adoption. Refactor this route so this opt-out can be removed.
+// See: https://nextjs.org/docs/app/guides/migrating-to-cache-components
+export const instant = false;
+
 export default async function ModDashboardPage() {
 	const t = await getTranslations("pages.mod");
 	const { session, permissions } = await getAdminContext();

src/app/mod/team/page.tsx

@@ -14,6 +14,10 @@ import {
 } from "@/lib/db";
 import { PERMS } from "@/lib/permissions";
 
+// TODO: Cache Components adoption. Refactor this route so this opt-out can be removed.
+// See: https://nextjs.org/docs/app/guides/migrating-to-cache-components
+export const instant = false;
+
 export default async function ModTeamLitePage() {
 	await requireModPermission([PERMS.MOD_TEAM_VIEW, PERMS.MODERATION_VIEW]);
 

src/app/mod/tickets/[id]/page.tsx

@@ -10,6 +10,10 @@ import { fetchTicketQueueOpenCounts } from "@/lib/admin/ticket-queue-counts";
 import { db, User, WebsiteTicket, WebsiteTicketMessage } from "@/lib/db";
 import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
 
+// TODO: Cache Components adoption. Refactor this route so this opt-out can be removed.
+// See: https://nextjs.org/docs/app/guides/migrating-to-cache-components
+export const instant = false;
+
 const Creator = alias(User, "ticket_creator");
 const Assignee = alias(User, "ticket_assignee");
 const MessageUser = alias(User, "ticket_message_user");

src/app/mod/tickets/desk/page.tsx

@@ -25,6 +25,10 @@ import { db, User, WebsiteTicket, WebsiteTicketMessage } from "@/lib/db";
 import { formatDate } from "@/lib/format-date";
 import { PERMS } from "@/lib/permissions";
 
+// TODO: Cache Components adoption. Refactor this route so this opt-out can be removed.
+// See: https://nextjs.org/docs/app/guides/migrating-to-cache-components
+export const instant = false;
+
 const Creator = alias(User, "ticket_creator");
 const Assignee = alias(User, "ticket_assignee");
 

src/app/mod/tickets/page.tsx

@@ -11,6 +11,10 @@ import { fetchTicketQueueOpenCounts } from "@/lib/admin/ticket-queue-counts";
 import { parseListParams } from "@/lib/admin-helpers";
 import { PERMS } from "@/lib/permissions";
 
+// TODO: Cache Components adoption. Refactor this route so this opt-out can be removed.
+// See: https://nextjs.org/docs/app/guides/migrating-to-cache-components
+export const instant = false;
+
 export default async function ModTicketInboxPage({
 	searchParams,
 }: {

src/app/mod/users/[id]/page.tsx

@@ -9,6 +9,10 @@ import { formatDate } from "@/lib/format-date";
 import { getAvatarUrl } from "@/lib/imager";
 import { PERMS } from "@/lib/permissions";
 
+// TODO: Cache Components adoption. Refactor this route so this opt-out can be removed.
+// See: https://nextjs.org/docs/app/guides/migrating-to-cache-components
+export const instant = false;
+
 export default async function ModUserDetailPage({
 	params,
 }: {

src/app/mod/users/page.tsx

@@ -10,6 +10,10 @@ import { getAvatarUrl } from "@/lib/imager";
 import { PERMS } from "@/lib/permissions";
 import type { DataTableColumn } from "@/types/common";
 
+// TODO: Cache Components adoption. Refactor this route so this opt-out can be removed.
+// See: https://nextjs.org/docs/app/guides/migrating-to-cache-components
+export const instant = false;
+
 type ModUserRow = {
 	id: number;
 	username: string;