fix: ensure E2E screenshot tests work consistently across CI and local (#150)

- Remove platform-specific browser channel (was using Chrome on macOS,
  Chromium in CI) - now uses default Chromium everywhere
- Add Docker-based test scripts for CI-identical local testing:
  - `npm run test:e2e:docker` - run tests in Docker
  - `npm run test:e2e:docker:update` - regenerate golden screenshots
- Regenerate golden screenshots using Docker/Linux environment

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
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Olivier Chafik 2025-12-15 15:12:36 +00:00 • committed by GitHub
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