Add dark mode, i18n, messenger/moderation/verify, admin CRUD parity

Web-tier features completing the AtomCMS→Next.js conversion (slice 2):

UI/UX:
- Dark mode: html.dark CSS-var overrides + ThemeSwitcher (localStorage,
  no-flash boot script) wired into the nav.
- i18n (next-intl, cookie-based / no URL routing): en + it catalogs,
  request.ts, provider in root layout, LanguageSwitcher; shell (nav,
  header, footer) fully translated. URLs + access-guard unchanged.
- globals.css: --muted/--border aliases used across admin pages.

User features:
- /messages: offline messages + friend-request accept (server action
  re-reads session, two directional rows, idempotent).
- Email verification: signed-token /verify route + sendVerification wired
  into register (best-effort, never blocks signup).
- Article reactions: toggle UI on news/[slug] + server action.
- Content moderation service (website_wordfilter + optional OpenAI
  moderations, fail-open) wired into article comments + guestbook.

Admin CRUD parity (Filament replacement):
- /admin/shop (+ new/[id]) packages CRUD + read-only orders.
- /admin/transactions read-only PayPal log.
- /admin/permissions, /admin/tags, /admin/ads (+ new/[id]),
  /admin/help-questions (+ new/[id]), /admin/radio/history,
  /admin/users/[id]/edit. All gated by requireStaff + logStaffActivity.

Verified: tsc 0, vitest 48/48, next build 0 (all routes incl. new
admin CRUD + /messages + /verify).

src/actions/admin-help.ts

@@ -0,0 +1,125 @@
+"use server";
+
+import { revalidatePath } from "next/cache";
+import { redirect } from "next/navigation";
+import { requireStaff } from "@/lib/admin/guard";
+import { prisma } from "@/lib/prisma";
+import { logStaffActivity } from "@/lib/services/staff-activity";
+
+// CRUD for help-center FAQ entries (website_help_center_categories). Each entry
+// is a titled content block with an optional image and call-to-action button.
+
+function parsePosition(value: FormDataEntryValue | null): number {
+  const n = Number(value);
+  return Number.isFinite(n) && n > 0 ? Math.floor(n) : 1;
+}
+
+export async function createHelpQuestion(formData: FormData): Promise<void> {
+  const staff = await requireStaff();
+  const name = String(formData.get("name") ?? "").trim().slice(0, 255);
+  const content = String(formData.get("content") ?? "").trim();
+  if (!name || !content) return;
+
+  const imageUrl = String(formData.get("imageUrl") ?? "").trim().slice(0, 255);
+  const buttonText = String(formData.get("buttonText") ?? "").trim().slice(0, 255);
+  const buttonUrl = String(formData.get("buttonUrl") ?? "").trim().slice(0, 255);
+  const buttonColor = String(formData.get("buttonColor") ?? "").trim().slice(0, 16) || "#eeb425";
+  const buttonBorderColor =
+    String(formData.get("buttonBorderColor") ?? "").trim().slice(0, 16) || "#facc15";
+
+  try {
+    const entry = await prisma.websiteHelpCenterCategories.create({
+      data: {
+        name,
+        content,
+        position: parsePosition(formData.get("position")),
+        imageUrl: imageUrl || null,
+        buttonText: buttonText || null,
+        buttonUrl: buttonUrl || null,
+        buttonColor,
+        buttonBorderColor,
+        smallBox: formData.get("smallBox") != null,
+      },
+    });
+    await logStaffActivity({
+      staffId: staff.id,
+      action: "help_create",
+      description: `Created help-center entry #${entry.id} (${name})`,
+      targetType: "help_center_category",
+      targetId: Number(entry.id),
+    });
+  } catch {
+    // Unique name collision or DB error — re-render unchanged.
+    revalidatePath("/admin/help-questions");
+    return;
+  }
+  redirect("/admin/help-questions");
+}
+
+export async function updateHelpQuestion(formData: FormData): Promise<void> {
+  const staff = await requireStaff();
+  const raw = String(formData.get("id") ?? "");
+  if (!/^\d+$/.test(raw)) return;
+  const id = BigInt(raw);
+
+  const name = String(formData.get("name") ?? "").trim().slice(0, 255);
+  const content = String(formData.get("content") ?? "").trim();
+  if (!name || !content) return;
+
+  const imageUrl = String(formData.get("imageUrl") ?? "").trim().slice(0, 255);
+  const buttonText = String(formData.get("buttonText") ?? "").trim().slice(0, 255);
+  const buttonUrl = String(formData.get("buttonUrl") ?? "").trim().slice(0, 255);
+  const buttonColor = String(formData.get("buttonColor") ?? "").trim().slice(0, 16) || "#eeb425";
+  const buttonBorderColor =
+    String(formData.get("buttonBorderColor") ?? "").trim().slice(0, 16) || "#facc15";
+
+  try {
+    await prisma.websiteHelpCenterCategories.update({
+      where: { id },
+      data: {
+        name,
+        content,
+        position: parsePosition(formData.get("position")),
+        imageUrl: imageUrl || null,
+        buttonText: buttonText || null,
+        buttonUrl: buttonUrl || null,
+        buttonColor,
+        buttonBorderColor,
+        smallBox: formData.get("smallBox") != null,
+      },
+    });
+    await logStaffActivity({
+      staffId: staff.id,
+      action: "help_update",
+      description: `Updated help-center entry #${id} (${name})`,
+      targetType: "help_center_category",
+      targetId: Number(id),
+    });
+  } catch {
+    // Not found, unique collision, or DB error — ignore.
+    revalidatePath(`/admin/help-questions/${id}`);
+    return;
+  }
+  redirect("/admin/help-questions");
+}
+
+export async function deleteHelpQuestion(formData: FormData): Promise<void> {
+  const staff = await requireStaff();
+  const raw = String(formData.get("id") ?? "");
+  if (!/^\d+$/.test(raw)) return;
+  const id = BigInt(raw);
+
+  try {
+    await prisma.websiteHelpCenterCategories.delete({ where: { id } });
+    await logStaffActivity({
+      staffId: staff.id,
+      action: "help_delete",
+      description: `Deleted help-center entry #${id}`,
+      targetType: "help_center_category",
+      targetId: Number(id),
+    });
+  } catch {
+    // Not found or DB error — ignore.
+  }
+  redirect("/admin/help-questions");
+}