refactor: remove dead code and unused exports

Delete proxy-auth.ts, types/index.ts, staff-user.ts+test, local-imports.ts+test (only used by their own tests). Remove unused foundation exports: sanitizeFilename, canonicalizeFormValue, canonicalizeFormData, ConflictError, getRequestStore, getClientIp, elapsed. Remove stale TODO comments from rank-authority.ts and notice.ts. Fix biome lint warnings in catalog-repair.ts.

src/lib/admin/notice.ts

@@ -1,4 +1,3 @@
-// TODO: Check of dit bestand weg kan — uitsluitend gebruikt door eigen test
 export interface AdminMutationNotice {
 	tone: "ok" | "danger";
 	label: "Saved" | "Error";

src/lib/admin/rank-authority.ts

@@ -1,4 +1,3 @@
-// TODO: Check of dit bestand weg kan — uitsluitend gebruikt door eigen test
 import type { AuthorizationActor } from "@/lib/admin/authorization-policy";
 
 export interface RankAuthorityDb {

src/lib/admin/staff-user.test.ts

@@ -1,20 +0,0 @@
-import { describe, expect, it } from "vitest";
-import { resolveStaffUser } from "@/lib/admin/staff-user";
-
-describe("resolveStaffUser", () => {
-	it("rejects a session whose database rank has been revoked", async () => {
-		const findUser = async () => ({ id: 7, rank: 1, username: "Alice" });
-
-		await expect(resolveStaffUser("7", 7, findUser)).resolves.toBeNull();
-	});
-
-	it("returns the current database identity instead of stale JWT values", async () => {
-		const findUser = async () => ({ id: 7, rank: 8, username: "CurrentName" });
-
-		await expect(resolveStaffUser("7", 7, findUser)).resolves.toEqual({
-			id: 7,
-			rank: 8,
-			username: "CurrentName",
-		});
-	});
-});

src/lib/admin/staff-user.ts

@@ -1,22 +0,0 @@
-// TODO: Check of dit bestand weg kan — uitsluitend gebruikt door eigen test
-import { isStaff } from "@/lib/admin/is-staff";
-
-export interface StaffUserRecord {
-	id: number;
-	rank: number;
-	username: string;
-}
-
-export type FindStaffUser = (id: number) => Promise<StaffUserRecord | null>;
-
-export async function resolveStaffUser(
-	sessionUserId: string,
-	minStaffRank: number,
-	findUser: FindStaffUser,
-): Promise<StaffUserRecord | null> {
-	const id = Number(sessionUserId);
-	if (!Number.isSafeInteger(id) || id <= 0) return null;
-
-	const user = await findUser(id);
-	return user && isStaff(user.rank, minStaffRank) ? user : null;
-}