test(js-client-sdk): adding hello app test

[joker23]

Requirements

• I have added test coverage for new or changed functionality
• I have followed the repository's pull request submission guidelines
• I have validated my changes against all supported platform versions

Related issues

sdk-1910

Describe the solution you've provided

added the test

Additional context

I deviated a bit from the specs and read the flag value from the UI. I think we should update the specs to include this as a way to verify.

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Note

Medium Risk
Adds new Playwright-based e2e execution to CI (including a new nightly workflow) and changes example env var expectations, which could cause CI failures or scheduled runs to break if secrets/roles or placeholders don’t match.

Overview
Adds a Playwright e2e smoke test for @launchdarkly/browser-example (with new playwright.config.ts, e2e/verify.spec.ts, and yarn test script/deps) that verifies the page reports the flag evaluates to true.

Updates the example’s configuration to use LAUNCHDARKLY_CLIENT_SIDE_ID/LAUNCHDARKLY_FLAG_KEY in .env.template, README, and tsdown.config.ts placeholder replacement.

Extends GitHub Actions to run the browser example test as part of browser.yml and introduces a new scheduled browser-nightly.yaml workflow that runs the same example job daily (including installing Chromium via Playwright).

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[github-actions]

@launchdarkly/js-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 25566 bytes
Compressed size limit: 26000
Uncompressed size: 125383 bytes

[github-actions]

@launchdarkly/browser size report
This is the brotli compressed size of the ESM build.
Compressed size: 172130 bytes
Compressed size limit: 200000
Uncompressed size: 800872 bytes

[github-actions]

@launchdarkly/js-client-sdk size report
This is the brotli compressed size of the ESM build.
Compressed size: 24212 bytes
Compressed size limit: 25000
Uncompressed size: 83755 bytes

[github-actions]

@launchdarkly/js-client-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 21281 bytes
Compressed size limit: 24000
Uncompressed size: 110213 bytes