Add Italian locale

app/(tabs)/settings.tsx

@@ -144,13 +144,15 @@ export default function SettingsScreen() {
     system: t("settings.language.system"),
     en: t("settings.language.en"),
     "zh-Hans": t("settings.language.zhHans"),
+    it: t("settings.language.it"),
   }
 
   const handleLanguagePress = useCallback(() => {
     Alert.alert(t("settings.language.title"), undefined, [
       { text: localeLabels.system, onPress: () => setLocale("system") },
       { text: localeLabels.en, onPress: () => setLocale("en") },
       { text: localeLabels["zh-Hans"], onPress: () => setLocale("zh-Hans") },
+      { text: localeLabels.it, onPress: () => setLocale("it") },
       { text: t("common.cancel"), style: "cancel" },
     ])
   }, [t, setLocale, localeLabels])

src/lib/i18n/catalog-parity.test.ts

@@ -1,12 +1,19 @@
-// Guards against locale drift: en.json and zh-Hans.json must expose exactly
-// the same set of translation keys, or i18next silently falls back to the
-// key path (en) / nothing sensible (missing zh copy) at runtime. Run with
-// plain `node --test` — no i18next/expo-localization imports needed, same
-// as locale-resolve.test.ts.
+// Guards against locale drift: every catalog must expose exactly the same
+// set of translation keys, or i18next silently falls back to the key path
+// (en) / nothing sensible (missing catalog copy) at runtime. Run with plain
+// `node --test` — no i18next/expo-localization imports needed, same as
+// locale-resolve.test.ts.
 import { test } from "node:test"
 import assert from "node:assert/strict"
 import en from "./en.json" with { type: "json" }
 import zhHans from "./zh-Hans.json" with { type: "json" }
+import it from "./it.json" with { type: "json" }
+
+const CATALOGS = [
+  ["en", en],
+  ["zh-Hans", zhHans],
+  ["it", it],
+] as const
 
 // Flattens a nested translation object into dotted leaf-key paths, e.g.
 // { settings: { language: { label: "..." } } } -> ["settings.language.label"]
@@ -24,19 +31,24 @@ function flattenKeys(obj: unknown, prefix = ""): string[] {
   return keys
 }
 
-test("en.json and zh-Hans.json expose identical translation keys", () => {
-  const enKeys = new Set(flattenKeys(en))
-  const zhKeys = new Set(flattenKeys(zhHans))
+test("all catalogs expose identical translation keys", () => {
+  for (const [nameA, catalogA] of CATALOGS) {
+    for (const [nameB, catalogB] of CATALOGS) {
+      if (nameA >= nameB) continue
+      const keysA = new Set(flattenKeys(catalogA))
+      const keysB = new Set(flattenKeys(catalogB))
 
-  const missingFromZh = [...enKeys].filter((k) => !zhKeys.has(k)).sort()
-  const missingFromEn = [...zhKeys].filter((k) => !enKeys.has(k)).sort()
+      const missingFromB = [...keysA].filter((k) => !keysB.has(k)).sort()
+      const missingFromA = [...keysB].filter((k) => !keysA.has(k)).sort()
 
-  assert.deepEqual(missingFromZh, [], `keys present in en.json but missing from zh-Hans.json: ${missingFromZh.join(", ")}`)
-  assert.deepEqual(missingFromEn, [], `keys present in zh-Hans.json but missing from en.json: ${missingFromEn.join(", ")}`)
+      assert.deepEqual(missingFromB, [], `keys present in ${nameA}.json but missing from ${nameB}.json: ${missingFromB.join(", ")}`)
+      assert.deepEqual(missingFromA, [], `keys present in ${nameB}.json but missing from ${nameA}.json: ${missingFromA.join(", ")}`)
+    }
+  }
 })
 
 test("no translation value is an empty string", () => {
-  for (const [name, catalog] of [["en", en], ["zh-Hans", zhHans]] as const) {
+  for (const [name, catalog] of CATALOGS) {
     const keys = flattenKeys(catalog)
     for (const key of keys) {
       const value = key.split(".").reduce<unknown>((acc, part) => (acc as Record<string, unknown>)?.[part], catalog)

src/lib/i18n/config.ts

@@ -7,11 +7,13 @@ import { initReactI18next } from "react-i18next"
 import * as Localization from "expo-localization"
 import en from "./en.json"
 import zhHans from "./zh-Hans.json"
+import it from "./it.json"
 import { resolveLocale, FALLBACK_LOCALE, type LocalePreference } from "./locale-resolve"
 
 const resources = {
   en: { translation: en },
   "zh-Hans": { translation: zhHans },
+  it: { translation: it },
 }
 
 /** Device locale tags in priority order, e.g. ["zh-Hans-CN", "en-US"]. */

src/lib/i18n/en.json

@@ -59,7 +59,8 @@
       "title": "Choose Language",
       "system": "System Default",
       "en": "English",
-      "zhHans": "Simplified Chinese"
+      "zhHans": "Simplified Chinese",
+      "it": "Italian"
     },
     "footer": {
       "appName": "OpenCode Mobile",