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/app/(site)/verify/page.tsx

@@ -1,5 +1,6 @@
-import { eq } from "drizzle-orm";
+import { asc, eq } from "drizzle-orm";
 import { CheckCircle2, Clock, MailX } from "lucide-react";
+import type { Metadata } from "next";
 import { getTranslations } from "next-intl/server";
 import { ResendVerificationForm } from "@/components/auth/resend-verification-form";
 import Link from "@/components/link";
@@ -7,6 +8,16 @@ import { SurfaceCard } from "@/components/surface-card";
 import { isValidVerificationToken } from "@/lib/auth/email-verification";
 import { db, User } from "@/lib/db";
 
+export async function generateMetadata(): Promise<Metadata> {
+	const t = await getTranslations("pages.verify");
+	return {
+		title: t("verifiedTitle"),
+		description: t("invalidSubtitle"),
+		// Token links are single-use; the page itself has nothing to index.
+		robots: { index: false, follow: false },
+	};
+}
+
 type Status = "verified" | "already" | "invalid" | "unavailable";
 
 function StatusCard({
@@ -31,7 +42,7 @@ function StatusCard({
 	const tint = tintMap[color] ?? tintMap.blue;
 
 	return (
-		<main className="flex min-h-[60vh] items-center justify-center px-4">
+		<section className="flex min-h-[60vh] items-center justify-center px-4">
 			<SurfaceCard className="w-full max-w-md">
 				<div
 					className="flex items-center gap-2.5 border-b px-5 py-4"
@@ -76,7 +87,7 @@ function StatusCard({
 					{children}
 				</div>
 			</SurfaceCard>
-		</main>
+		</section>
 	);
 }
 
@@ -98,11 +109,14 @@ export default async function VerifyPage({
 		const ok = await isValidVerificationToken(normalisedEmail, token);
 		if (ok) {
 			try {
-				const [user] = await db
+				// Legacy databases allow duplicate addresses; always resolve the
+				// oldest account so the link cannot verify a different one.
+				const matches = await db
 					.select({ id: User.id, mailVerified: User.mailVerified })
 					.from(User)
 					.where(eq(User.mail, normalisedEmail))
-					.limit(1);
+					.orderBy(asc(User.id));
+				const user = matches[0];
 				if (!user) {
 					status = "invalid";
 				} else if (user.mailVerified === "1") {
@@ -173,6 +187,21 @@ export default async function VerifyPage({
 					<p className="text-sm" style={{ color: "var(--color-text-muted)" }}>
 						{t("unavailableBody")}
 					</p>
+					{/* Transient failure: offer both the retry path and the way out
+					    instead of leaving the visitor stranded on this card. */}
+					<ResendVerificationForm />
+					<Link
+						href="/login"
+						className={`${linkClass} !shadow-none`}
+						style={{
+							background: "transparent",
+							color: "var(--color-text-readable)",
+							border:
+								"2px solid color-mix(in srgb, var(--color-text-muted) 20%, transparent)",
+						}}
+					>
+						{t("backToLogin")}
+					</Link>
 				</StatusCard>
 			)}