feat(overlays): add managed overlay package

packages/overlays/src/locales/catalogs.test.ts

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+import { describe, expect, it } from "vitest"
+
+import { overlayCatalogLocales } from "./catalogs"
+import { messages as englishMessages } from "./en-US"
+import { messages as simplifiedChineseMessages } from "./zh-Hans"
+
+describe("overlay message catalogs", () => {
+  it("provide the same messages for every supported locale", () => {
+    expect(overlayCatalogLocales).toEqual(["en-US", "zh-Hans"])
+    expect(new Set(Object.keys(simplifiedChineseMessages))).toEqual(
+      new Set(Object.keys(englishMessages))
+    )
+  })
+})

packages/overlays/src/locales/catalogs.ts

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+import type { overlayMessages } from "../messages"
+
+export const overlayCatalogLocales = ["en-US", "zh-Hans"] as const
+
+interface MessageDescriptorMap {
+  readonly [key: string]: {
+    readonly id: string
+  }
+}
+
+type MessageId<T extends MessageDescriptorMap> = T[keyof T]["id"]
+
+export type OverlayCatalogLocale = (typeof overlayCatalogLocales)[number]
+export type OverlayMessageCatalog = Readonly<
+  Record<MessageId<typeof overlayMessages>, string>
+>

packages/overlays/src/locales/en-US.ts

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+import type { OverlayMessageCatalog } from "./catalogs"
+
+export const locale = "en-US"
+export const languageTag = "en-US"
+export const messages = {
+  "overlays.actions.cancel": "Cancel",
+  "overlays.actions.close": "Close",
+  "overlays.actions.confirm": "Confirm",
+  "overlays.actions.okay": "OK",
+  "overlays.prompt.inputLabel": "Value",
+} as const satisfies OverlayMessageCatalog

packages/overlays/src/locales/zh-Hans.ts

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+import type { OverlayMessageCatalog } from "./catalogs"
+
+export const locale = "zh-Hans"
+export const languageTag = "zh-Hans"
+export const messages = {
+  "overlays.actions.cancel": "取消",
+  "overlays.actions.close": "关闭",
+  "overlays.actions.confirm": "确认",
+  "overlays.actions.okay": "确定",
+  "overlays.prompt.inputLabel": "输入值",
+} as const satisfies OverlayMessageCatalog