Save this content to: .cursor/rules/30-frontend-ts-vite-pentatrion.mdc

Work only on the requested entrypoint, module, component, or stylesheet.

Prefer:
- strict TypeScript typing
- small modules and focused edits
- preserving the current Vite entrypoint strategy: one library build, entry `src/Resources/assets/src/iife.ts`
  (`index.ts` exports `mount` / `unmount` for hosts that bundle the sources themselves)
- editing existing initialization code instead of creating parallel bootstraps
- TypeScript sources live in `src/Resources/assets/src/`, Vitest specs in `src/Resources/assets/tests/`
- the build output is the single IIFE `src/Resources/public/js/nowo-chat.js` (`vite.config.ts` `outDir`
  `src/Resources/public/js`), produced by `make assets` (`pnpm run build` = `vite build` in the container); the
  stylesheet `src/Resources/public/css/nowo-chat.css` is hand-written source, not a build output
- the dock markup comes from Twig `<template>` blocks in `src/Resources/views/_templates.html.twig`; keep `data-part`
  hooks in sync between Twig and `templates.ts` / `dock.ts` / `thread.ts`
- running `make test-ts` (Vitest with coverage) after a change
- preserving integration points used by Twig or Symfony rendering
- JSDoc in English for exported APIs, non-obvious functions, and complex behavior

Do not inspect the minified `src/Resources/public/js/nowo-chat.js` or other generated assets.
The bundle does not use Pentatrion Vite Bundle (only the demo app does, for its own `assets/app.ts`); do not add `vite_entry_*` tags to bundle templates.
Do not add JSDoc in Spanish.
Do not edit generated build output.
Do not rewrite the whole frontend architecture unless explicitly requested.