🎨 Palette: Add ARIA labels to icon-only buttons

[khangnghiem]

💡 What: Added explicit aria-label attributes to numerous icon-only buttons in site/index.html (e.g., #sidebar-toggle-btn, #share-btn-chrome, #settings-gear-btn, #hamburger-toggle-btn, #lp-sidebar-toggle, #lp-import-btn, #code-fold-btn).

🎯 Why: Without an accessible name, screen readers will either announce the element vaguely as "button" or attempt to read meaningless svg properties. These changes ensure users navigating via screen readers can understand the purpose of each main interface action button.

📸 Before/After:

• Before: <button class="canvas-chrome-btn" id="sidebar-toggle-btn" title="Toggle sidebar (\)"> <svg>...</svg> </button>
• After: <button class="canvas-chrome-btn" id="sidebar-toggle-btn" title="Toggle sidebar (\)" aria-label="Toggle sidebar"> <svg>...</svg> </button>

♿ Accessibility: Improves compliance with WCAG success criteria 4.1.2 (Name, Role, Value) by explicitly providing text equivalents for icon-driven functionality.

---

PR created automatically by Jules for task 7123679287741392150 started by @khangnghiem

[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.

[chatgpt-codex-connector]

You have reached your Codex usage limits for code reviews. You can see your limits in the Codex usage dashboard.