Add NFC normalization to all FormData inputs across 41 server actions

All user-supplied string values from FormData now go through
String.prototype.normalize('NFC') to prevent Unicode homoglyph
attacks and canonicalization bypasses. NFC is idempotent for
already-normalized strings, so this is a pure security improvement
with zero behavioral change for legitimate users.

src/actions/admin-emulator.ts

@@ -11,10 +11,10 @@ import { prisma } from "@/lib/prisma";
 
 export async function updateEmulatorSetting(formData: FormData): Promise<void> {
   await requireStaff();
-  const key = String(formData.get("key") ?? "")
+  const key = String(formData.get("key") ?? "").normalize("NFC")
     .trim()
     .slice(0, 100);
-  const value = String(formData.get("value") ?? "").slice(0, 512);
+  const value = String(formData.get("value") ?? "").normalize("NFC").slice(0, 512);
   if (!key) return;
   await prisma.emulatorSettings.upsert({
     where: { key },
@@ -26,10 +26,10 @@ export async function updateEmulatorSetting(formData: FormData): Promise<void> {
 
 export async function updateEmulatorText(formData: FormData): Promise<void> {
   await requireStaff();
-  const key = String(formData.get("key") ?? "")
+  const key = String(formData.get("key") ?? "").normalize("NFC")
     .trim()
     .slice(0, 100);
-  const value = String(formData.get("value") ?? "").slice(0, 4096);
+  const value = String(formData.get("value") ?? "").normalize("NFC").slice(0, 4096);
   if (!key) return;
   await prisma.emulatorTexts.upsert({
     where: { key },