feat(plugins): add screencast plugin (replaces subtitles)

[DavertMik]

Summary

• Adds a new screencast plugin built on Playwright 1.59's page.screencast API. Records WebM video, optionally burns in action captions (showActions), and optionally writes a standalone .srt.
• Wires into the unified on= parameter from feat(plugins): unify screenshot/pause/aiTrace/heal under shared on= parameter #5542 with two modes: on=fail (default — deletes the recording on pass) and on=test (always keeps).
• Removes the legacy subtitles plugin entirely (and its unit test) — replaced by screencast({ subtitles: true }).
• Bumps playwright devDependency to ^1.59.0 (required for page.screencast).
• Updates examples/codecept.config.js to demonstrate the new plugin in place of the removed subtitles.

Configuration

plugins: {
  screencast: {
    enabled: true,
    on: 'fail',          // 'fail' (default) | 'test'
    captions: true,      // burn-in action overlays via showActions()
    subtitles: false,    // also write a standalone .srt
    video: true,         // false + subtitles:true = SRT-only
  }
}

CLI:

npx codeceptjs run -p screencast
npx codeceptjs run -p screencast:on=test
npx codeceptjs run -p screencast:on=test;captions=false;subtitles=true

Verification

• 8 new unit tests covering all modes, captions toggle, subtitles, video=false fallback, missing-API guard, invalid-mode rejection. Full plugin unit suite: 60/60 passing, lint clean.
• Real Playwright 1.59 smoke run against the examples/ project: produced output/screencast/*.webm (52KB) and *.srt. Confirmed empirically that helper-level video: true and the plugin coexist without conflict — they write to separate directories (warning is documented).

Test plan

• npm run lint
• npx mocha 'test/unit/plugin/**/*_test.js'
• Run examples/ with screencast: { enabled: true, on: 'test', subtitles: true } against a real test; verify output/screencast/*.webm and matching .srt appear.
• Verify -p screencast:on=fail deletes the .webm for a passing test.

Notes

• Removed plugin (clean break, not a deprecation alias):
  • lib/plugin/subtitles.js
  • test/unit/plugin/subtitles_test.js
• The plugin starts the screencast on the first event.step.started (rather than event.test.before) because helper.page is created lazily during the first step.

🤖 Generated with Claude Code