🧹 [Code Health] Replace console statements with proper logger

[djmbdv]

🎯 What: Replaced direct usage of console.log and console.warn with a new logger utility in AstRenderer.js, index.js, and stringToTokens.js.
💡 Why: Improves code health by centralizing console calls and adding safety checks to ensure console methods exist before calling them, which is a common best practice in production code environments (where console or its methods may be unavailble or intentionally overridden/disabled).
✅ Verification: Verified formatting with npm run format-check and ensured unit tests passed successfully.
✨ Result: The codebase is cleaner, console.log in AstRenderer conditional log has been encapsulated within the class logic, and overall resilience to varying runtime environments has increased.

---

PR created automatically by Jules for task 15653442013010121837 started by @djmbdv

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.