🎨 Palette: Improve Guest Mode UX

[google-labs-jules]

• 💡 What: Replaced the blocking window.prompt in RegisterPage.tsx with auto-generated "fun" nicknames (e.g., "Mago Veloz").
• 🎯 Why: To reduce friction for new users wanting to try the game immediately. The previous prompt was intrusive and outdated.
• 📸 Verification: Confirmed via Playwright script and screenshot that the guest flow correctly redirects to the dashboard without user input.
• ♿ Accessibility: Removed a blocking modal that can be problematic for screen readers and focus management.

---

PR created automatically by Jules for task 5149763296248046295 started by @albertoivo

[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.

[github-actions]

Visit the preview URL for this PR (updated for commit cd8ea1f):

https://pyexplorer-cd32d--pr122-palette-guest-mode-f-5yi6p8dl.web.app

_{(expires Sun, 01 Feb 2026 06:25:45 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: 916b4905e0cdc420f3368c8eb19b2f2e90c3be61}