Draw the mockup with the screens' own words, compile every text while building, and send the language with the live updates

- The page takes the screens' words its mockup draws from their own texts: screen.ha (Home Assistant's words, filled
  from Home Assistant), screen.time, screen.date, screen.number and screen.tile.page, per language next to _meta and
  editor. The copies under editor.mockup go; the rest of `screen` and all of `addon` stay out of the build.
- Numbers in the mockup follow the screens' language (screen.number, with its minimum grouping) or the chosen style,
  as the firmware writes them.
- @intlify/unplugin-vue-i18n compiles every text at build time, so the page runs vue-i18n's runtime-only build
  without the message compiler; every language's _meta comes with the page. Empty texts stay out while building.
- The live updates carry the editor's language (api/events?language=), as an EventSource sends no headers.
- web/ needs Node 22.13 or newer: vue-i18n 11.4, Vite 7 and the unplugin ask for it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

web/env.d.ts

@@ -4,3 +4,8 @@ declare module "*.vue" {
   const component: DefineComponent<{}, {}, any>;
   export default component;
 }
+// Every language's _meta by its code, from screen_manager/translations (vite.config.ts, app 0.2.90).
+declare module "virtual:esp-screens-languages" {
+  const languages: Record<string, { name: string; english: string; script?: string; plural: string; clock?: string; checked: boolean }>;
+  export default languages;
+}