ci: run lint before end-to-end tests

[jinbagi]

Summary

• run the zero-warning ESLint gate in the existing frontend E2E workflow
• fail before browser installation and container startup when static checks regress

Verification

• pnpm lint
• parsed .github/workflows/e2e.yml with the repository's YAML parser

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-02T15:28:10.050209Z	4493af0	PR opened

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