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/api/admin/import/furni/route.ts

@@ -5,7 +5,7 @@ import { invalidateCatalogTotals } from "@/features/catalog/server/catalog-total
 import { apiError, apiOk } from "@/lib/api";
 import { withAdmin } from "@/lib/api-handler";
 import { db, ItemsBase, queryRows } from "@/lib/db";
-import { normalizeClassname } from "@/lib/furni/classname";
+import { isSafeAssetName, normalizeClassname } from "@/lib/furni/classname";
 import { localFurnitureStatus } from "@/lib/furni/local-presence";
 import { PERMS } from "@/lib/permissions";
 import { logAudit } from "@/lib/services/audit";
@@ -709,9 +709,20 @@ export const PATCH = withAdmin(
 			[];
 
 		for (const item of items) {
-			const starIdx = item.classname.indexOf("*");
+			const normalised = item.classname.trim();
+			// The classname is joined straight into a `.nitro` file path, so a
+			// separator/looking payload must never get that far.
+			if (!isSafeAssetName(normalised)) {
+				results.push({
+					classname: item.classname,
+					ok: false,
+					warning: "Invalid classname",
+				});
+				continue;
+			}
+			const starIdx = normalised.indexOf("*");
 			const baseClassname =
-				starIdx !== -1 ? item.classname.substring(0, starIdx) : item.classname;
+				starIdx !== -1 ? normalised.substring(0, starIdx) : normalised;
 			const nitroPath = path.join(
 				/*turbopackIgnore: true*/ nitroDir,
 				`${baseClassname}.nitro`,

src/app/api/admin/users/actions/route.ts

@@ -6,11 +6,20 @@ import { PERMS } from "@/lib/permissions";
 import { rcon } from "@/lib/services/rcon";
 import { logStaffActivity } from "@/lib/services/staff-activity";
 
+/** Currency grants are capped: an unbounded `amount` minted an economy-breaking
+ *  balance with a single request. */
+function positiveAmount(amount: number): boolean {
+	return Number.isInteger(amount) && amount > 0 && amount <= MAX_CURRENCY_GRANT;
+}
+
+const MAX_CURRENCY_GRANT = 1_000_000;
+
 export const POST = withAdmin(
 	{ permission: PERMS.USERS_EDIT },
 	async (request, context) => {
 		const staffId = context.session.user.id;
 		const staffRank = context.session.user.rank;
+		const isSuper = context.permissions.isSuperAdmin;
 		const formData = await request.formData();
 		const userId = Number(formData.get("userId"));
 		const username = String(formData.get("username") || "");
@@ -23,6 +32,33 @@ export const POST = withAdmin(
 			);
 		}
 
+		// Every branch below acts on a live account, so the rank guard that the
+		// set_rank branch already applies belongs to all of them: staff may not
+		// act on users at or above their own rank unless they are the hotel's
+		// dynamic owner.
+		if (action !== "set_rank") {
+			const [target] = await db
+				.select({ rank: User.rank })
+				.from(User)
+				.where(eq(User.id, userId))
+				.limit(1);
+			if (!target) {
+				return NextResponse.json(
+					{ success: false, message: "User not found" },
+					{ status: 404 },
+				);
+			}
+			if (!isSuper && target.rank >= staffRank) {
+				return NextResponse.json(
+					{
+						success: false,
+						message: "Cannot act on a user at or above your rank",
+					},
+					{ status: 403 },
+				);
+			}
+		}
+
 		if (action === "set_rank") {
 			const rank = Number(formData.get("rank") || "0");
 			if (!Number.isInteger(rank) || rank < 1) {
@@ -141,7 +177,7 @@ export const POST = withAdmin(
 
 		if (action === "give_credits") {
 			const credits = Number(formData.get("credits") || "0");
-			if (!credits || credits <= 0) {
+			if (!positiveAmount(credits)) {
 				return NextResponse.json(
 					{ success: false, message: "Invalid credit amount" },
 					{ status: 400 },
@@ -166,7 +202,7 @@ export const POST = withAdmin(
 
 		if (action === "give_duckets") {
 			const amount = Number(formData.get("amount") || "0");
-			if (!amount || amount <= 0) {
+			if (!positiveAmount(amount)) {
 				return NextResponse.json(
 					{ success: false, message: "Invalid duckets amount" },
 					{ status: 400 },
@@ -188,7 +224,7 @@ export const POST = withAdmin(
 
 		if (action === "give_diamonds") {
 			const amount = Number(formData.get("amount") || "0");
-			if (!amount || amount <= 0) {
+			if (!positiveAmount(amount)) {
 				return NextResponse.json(
 					{ success: false, message: "Invalid diamonds amount" },
 					{ status: 400 },
@@ -213,7 +249,7 @@ export const POST = withAdmin(
 
 		if (action === "give_points") {
 			const amount = Number(formData.get("amount") || "0");
-			if (!amount || amount <= 0) {
+			if (!positiveAmount(amount)) {
 				return NextResponse.json(
 					{ success: false, message: "Invalid points amount" },
 					{ status: 400 },