feat: harden atoms-nexst against review findings (37 items)

Second review pass covering security, performance, admin tooling and the
public/room flows. All HIGH and MEDIUM findings from the audit are resolved;
nothing in this commit changes the visible feature set.

Authentication & session security
- CSP is now set on the request headers in the proxy, which is what Next.js
  uses to derive the render nonce, so the nonce is effective.
- 2FA: an already-enabled user cannot re-enroll, the setup endpoint is
  rate-limited per account, and confirmed codes are persisted so the second
  secret no longer silently never applies.
- Password reset revokes the ticket, authTicket and all personal access
  tokens, and bumps the token version so existing sessions die. The same
  revocation is now wired into the staff-side password reset.
- /reset and /verify return a stable error code instead of raw text; the
  mail lookups are ordered by id so duplicates cannot vary between runs.
- Resending the verification mail gets a per-address cooldown on top of the
  per-user limit.
- Issue API tokens with the narrower radio/ticket ability set instead of "*".

Authorization & input handling
- Mid-rank staff can no longer keep dynamically granted non-view admin.*
  permissions: existing grants are revoked by migration and the grant lookup
  is restricted to "%.view". Rank guards use the dynamic super-admin check.
- Alerting a user is permission-checked and audited like the other tools.
- Material mutations (giveCredits/giveDuckets/giveDiamonds, the admin user
  actions route, bulk user actions) are capped and rank-guarded, and bulk
  ids are bounded.
- updateRoom / updateRoomItem write through a field allowlist, and items
  may only be edited through their own room.
- Classnames reaching the filesystem are validated before use so a crafted
  value cannot escape the asset directories.
- The word filter now also covers offline mails, guild forum threads and
  replies, and user mottos.
- Media uploads are validated by magic bytes, /api/media requires the page
  edit permission, APP_URL must be configured once mail is enabled, and the
  diagnostics error route checks the fetch site header.

Admin tooling
- Secret settings render masked and cannot be overwritten with a blank or
  an arbitrary raw key; radio credentials are new password inputs.
- Commandocentrum balance changes are audited.
- Admin list pagination reads the caller's per-page instead of the max, and
  the log exporter caps offset and search length.

Performance
- Catalog translations are cached per module, with a cheap revision hash;
  the public online count uses a stale window instead of hammering the DB.
- The cache warmup now primes the payload the home route actually reads.
- TopHeader batches its queries into one round trip, and LCP avatars load
  eagerly.
- motion/react and sonner are no longer part of the root layout; the nav
  dropdown and mobile nav panels are lazy client chunks. Anonymous visitors
  again get the navigation chrome, and public pages get an edge cacheable
  response.

Accessibility
- Nested <main> elements in phase pages became <section>; the page entrance
  and route progress animations are pure CSS that respect reduced motion.

src/lib/services/home-payload.ts

@@ -0,0 +1,51 @@
+import "server-only";
+
+import { and, count, desc, eq, or, sql } from "drizzle-orm";
+import { db, User, WebsiteArticles } from "@/lib/db";
+import { resolveHotelName } from "@/lib/hotel-name";
+import { apiCacheKey, cacheSafe } from "@/lib/redis-cache";
+import { cacheNews } from "@/lib/services/news-cache";
+
+/**
+ * The `/api/home` landing payload: latest 4 published articles plus the current
+ * online player count. Shared as a loader so the cache warm-up can prime the
+ * exact same key the route reads — priming a placeholder instead made every
+ * instance serve a bogus `{ primed: true }` payload after each restart.
+ */
+export async function loadHomePayload() {
+	const [articles, onlineRows, hotelName] = await Promise.all([
+		db
+			.select({
+				id: WebsiteArticles.id,
+				title: WebsiteArticles.title,
+				slug: WebsiteArticles.slug,
+				shortStory: WebsiteArticles.shortStory,
+				image: WebsiteArticles.image,
+				createdAt: WebsiteArticles.createdAt,
+			})
+			.from(WebsiteArticles)
+			.where(
+				and(
+					eq(WebsiteArticles.status, "published"),
+					or(
+						sql`${WebsiteArticles.publishAt} IS NULL`,
+						sql`${WebsiteArticles.publishAt} <= NOW()`,
+					),
+				),
+			)
+			.orderBy(desc(WebsiteArticles.createdAt))
+			.limit(4),
+		db.select({ total: count() }).from(User).where(eq(User.online, "1")),
+		resolveHotelName(),
+	]);
+	return cacheSafe({
+		articles,
+		online: onlineRows[0]?.total ?? 0,
+		hotelName,
+	});
+}
+
+/** Cached read of {@link loadHomePayload} under the route's own key. */
+export async function cachedHomePayload() {
+	return cacheNews(apiCacheKey("home"), 15_000, loadHomePayload);
+}