chore: upgrade eslint to 9.39.2

[RomneyDa]

Description

• Bump eslint to ^9, change configs to js
• Fixes failing security scans

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Continue Tasks: ▶️ 1 queued — View all

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Summary by cubic

Upgraded ESLint to v9 and migrated all packages to the flat config format with a shared rules module for consistent linting. Simplifies lint scripts and keeps package-specific overrides intact across core, GUI, and VSCode.

• Refactors

  • Replaced .eslintrc*.json with eslint.config.js in core, GUI, and VSCode, using sharedRules/sharedIgnores from eslint.shared.js.
  • Simplified scripts to "eslint ." and "eslint . --fix".
  • Preserved local overrides: core complexity/size limits and stricter no-floating-promises, VSCode keeps no-misused-promises as warn, GUI keeps React and no-barrel-files plugins with browser globals.

• Migration

  • Requires Node 18.18+.
  • Run npm install to pick up ESLint 9 and plugin updates.
  • Use npm run lint / npm run lint:fix; no --ext flag needed.

^{Written for commit 4d8878a. Summary will update on new commits.}

[github-actions]

✅ Review Complete

Code Review Summary

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[cubic-dev-ai]

No issues found across 18 files