feat(i18n): add Hebrew translation

Add full Hebrew (he) locale support for the web app:
- 946 app translation keys (packages/app/src/i18n/he.ts)
- 162 UI translation keys (packages/ui/src/i18n/he.ts)
- Register Hebrew in language system with RTL document direction
- Add locale matcher and parity test coverage

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

Author: MusiCode1

packages/app/src/context/language.tsx

@@ -24,6 +24,7 @@ export type Locale =
   | "th"
   | "bs"
   | "tr"
+  | "he"
 
 type RawDictionary = typeof en & typeof uiEn
 type Dictionary = i18n.Flatten<RawDictionary>
@@ -51,6 +52,7 @@ const LOCALES: readonly Locale[] = [
   "br",
   "th",
   "tr",
+  "he",
 ]
 
 const INTL: Record<Locale, string> = {
@@ -71,6 +73,7 @@ const INTL: Record<Locale, string> = {
   th: "th",
   bs: "bs",
   tr: "tr",
+  he: "he",
 }
 
 const LABEL_KEY: Record<Locale, keyof Dictionary> = {
@@ -91,6 +94,7 @@ const LABEL_KEY: Record<Locale, keyof Dictionary> = {
   th: "language.th",
   bs: "language.bs",
   tr: "language.tr",
+  he: "language.he",
 }
 
 const base = i18n.flatten({ ...en, ...uiEn })
@@ -116,6 +120,7 @@ const loaders: Record<Exclude<Locale, "en">, () => Promise<Dictionary>> = {
   th: () => merge(import("@/i18n/th"), import("@opencode-ai/ui/i18n/th")),
   bs: () => merge(import("@/i18n/bs"), import("@opencode-ai/ui/i18n/bs")),
   tr: () => merge(import("@/i18n/tr"), import("@opencode-ai/ui/i18n/tr")),
+  he: () => merge(import("@/i18n/he"), import("@opencode-ai/ui/i18n/he")),
 }
 
 function loadDict(locale: Locale) {
@@ -154,6 +159,7 @@ const localeMatchers: Array<{ locale: Locale; match: (language: string) => boole
   { locale: "th", match: (language) => language.startsWith("th") },
   { locale: "bs", match: (language) => language.startsWith("bs") },
   { locale: "tr", match: (language) => language.startsWith("tr") },
+  { locale: "he", match: (language) => language.startsWith("he") },
 ]
 
 function detectLocale(): Locale {
@@ -218,6 +224,7 @@ export const { use: useLanguage, provider: LanguageProvider } = createSimpleCont
     createEffect(() => {
       if (typeof document !== "object") return
       document.documentElement.lang = locale()
+      document.documentElement.dir = locale() === "ar" || locale() === "he" ? "rtl" : "ltr"
       document.cookie = cookie(locale())
     })
 

packages/app/src/i18n/en.ts

@@ -416,6 +416,7 @@ export const dict = {
   "language.bs": "Bosanski",
   "language.th": "ไทย",
   "language.tr": "Türkçe",
+  "language.he": "עברית",
 
   "toast.language.title": "Language",
   "toast.language.description": "Switched to {{language}}",