node-opcua / node-opcua / 25742810475

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feat(client-browser): scaffold package + Playwright E2E harness

First of several PRs splitting up the browser-client work. This drop
establishes:

- The `node-opcua-client-browser` package layout: `package.json`,
  `tsconfig.json` (+ ESM variant), `LICENSE`, `README.md`.
- A Playwright harness that builds a minimal test page with `esbuild`,
  serves it over a plain Node HTTP server, and loads it headless in
  Chromium.
- One smoke spec (`test/e2e/smoke.spec.ts`) that verifies the build
  toolchain and browser-module evaluation end-to-end.

No WebSocket transport yet, no `createBrowserClient`, no production
browser bundle — those arrive in follow-up PRs. `source/index.ts` just
exports a `VERSION` constant so the package compiles.

## Files added

- `packages/node-opcua-client-browser/package.json`
- `packages/node-opcua-client-browser/tsconfig.json`
- `packages/node-opcua-client-browser/tsconfig.esm.json`
- `packages/node-opcua-client-browser/LICENSE`
- `packages/node-opcua-client-browser/README.md`
- `packages/node-opcua-client-browser/source/index.ts`
- `packages/node-opcua-client-browser/playwright.config.ts`
- `packages/node-opcua-client-browser/build-test-page.mjs`
- `packages/node-opcua-client-browser/test/tsconfig.json`
- `packages/node-opcua-client-browser/test/e2e/harness.ts`
- `packages/node-opcua-client-browser/test/e2e/smoke.spec.ts`
- `packages/node-opcua-client-browser/test/page/index.html`
- `packages/node-opcua-client-browser/test/page/main.ts`

## Files modified

- `.gitignore` — adds `dist-esm/` and `dist-browser-bundle/`.
- `packages/tsconfig.json` — registers the new package as a project
  reference so `pnpm run build` from the workspace root compiles it.

## Deps

Only `@playwright/test` and `esbuild` as devDeps. Runtime deps are empty
and will be added in the transport PR.

## Running the smoke spec

    pnpm exec playwright install chromium   # first time only
    pnpm --filter node-opcua-client-browser run test:e2e

The spec as... (continued)

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