refactor(admin): organize user actions and improve content editing UX

src/app/admin/users/user-list-navigation.test.ts

@@ -0,0 +1,19 @@
+import { expect, it } from "vitest";
+import { userDetailHref, userListHref } from "./user-list-navigation";
+
+it("preserves search filters and pagination through detail and edit links", () => {
+	const query = "search=Mario%20Rossi&page=3&filter_online=1&perPage=50";
+	for (const mode of ["show", "edit"] as const) {
+		const link = new URL(
+			userDetailHref(9, mode, query),
+			"https://example.test",
+		);
+		expect(userListHref(link.searchParams.get("list") ?? "")).toBe(
+			"/admin/users?search=Mario+Rossi&page=3&filter_online=1&perPage=50",
+		);
+	}
+});
+it("always returns a local users-list URL", () => {
+	expect(userListHref("")).toBe("/admin/users");
+	expect(userListHref("https://other.example")).toMatch(/^\/admin\/users\?/);
+});