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/actions/commandocentrum.ts

@@ -7,12 +7,30 @@ import { db, queryRows, User } from "@/lib/db";
 import { PERMS } from "@/lib/permissions";
 import { adminAction } from "@/lib/safe-action";
 import { ActionError, actionOk } from "@/lib/safe-action-shared";
+import { logAudit } from "@/lib/services/audit";
 import { rcon } from "@/lib/services/rcon";
 
 const PATH = "/admin/commandocentrum";
 
 const RCON_FAIL = "RCON command failed. Is the emulator running?";
 
+/** Currency amounts are capped: unbounded values break the hotel economy. */
+const MAX_CURRENCY = 1_000_000;
+
+/** Every mutation here gets an audit entry; rank changes and RCON most of all. */
+function auditAction(
+	userId: number,
+	action: string,
+	targetId: number,
+	after: Record<string, unknown>,
+): void {
+	try {
+		logAudit({ userId, action, target: "User", targetId, after });
+	} catch {
+		/* auditing must never fail the command it describes */
+	}
+}
+
 async function requireRconOk(ok: boolean): Promise<void> {
 	if (!ok) throw new ActionError(RCON_FAIL);
 }
@@ -120,9 +138,16 @@ const giveCreditsSchema = z.object({
 export const giveCredits = adminAction(
 	{ permission: PERMS.RCON_EXECUTE, schema: giveCreditsSchema },
 	async (ctx) => {
+		if (ctx.data.credits > MAX_CURRENCY) {
+			throw new ActionError(`Amount is too large (max ${MAX_CURRENCY})`);
+		}
 		await requireRconOk(
 			await rcon.giveCredits(ctx.data.userId, ctx.data.credits),
 		);
+		auditAction(Number(ctx.session.user.id), "give_credits", ctx.data.userId, {
+			userId: ctx.data.userId,
+			amount: ctx.data.credits,
+		});
 		revalidatePath(PATH);
 		return actionOk();
 	},
@@ -137,9 +162,16 @@ const giveAmountSchema = z.object({
 export const giveDuckets = adminAction(
 	{ permission: PERMS.RCON_EXECUTE, schema: giveAmountSchema },
 	async (ctx) => {
+		if (ctx.data.amount > MAX_CURRENCY) {
+			throw new ActionError(`Amount is too large (max ${MAX_CURRENCY})`);
+		}
 		await requireRconOk(
 			await rcon.giveDuckets(ctx.data.userId, ctx.data.amount),
 		);
+		auditAction(Number(ctx.session.user.id), "give_duckets", ctx.data.userId, {
+			userId: ctx.data.userId,
+			amount: ctx.data.amount,
+		});
 		revalidatePath(PATH);
 		return actionOk();
 	},
@@ -149,9 +181,16 @@ export const giveDuckets = adminAction(
 export const giveDiamonds = adminAction(
 	{ permission: PERMS.RCON_EXECUTE, schema: giveAmountSchema },
 	async (ctx) => {
+		if (ctx.data.amount > MAX_CURRENCY) {
+			throw new ActionError(`Amount is too large (max ${MAX_CURRENCY})`);
+		}
 		await requireRconOk(
 			await rcon.giveDiamonds(ctx.data.userId, ctx.data.amount),
 		);
+		auditAction(Number(ctx.session.user.id), "give_diamonds", ctx.data.userId, {
+			userId: ctx.data.userId,
+			amount: ctx.data.amount,
+		});
 		revalidatePath(PATH);
 		return actionOk();
 	},