🎨 Palette: Safe and Accessible External Links

[google-labs-jules]

💡 What:
- Modified src/components/chat/MessageItem.tsx to render Markdown links with target="_blank", rel="noopener noreferrer", and an appended sr-only span indicating "(opens in a new tab)".
- Modified src/components/chat/ToolRevealArtifact.tsx and src/components/wizard/ToolReveal.tsx to add rel="noopener noreferrer" and aria-label to the "Visit Website" buttons.

🎯 **Why:**
- **Usability:** Users were losing their chat session/context when clicking AI-generated links that opened in the same tab.
- **Security:** `rel="noopener noreferrer"` prevents the new page from accessing the `window.opener` property.
- **Accessibility:** Screen reader users need to know when a link will open a new tab to avoid confusion.

📸 **Before/After:**
- **Before:** Links opened in same tab, no "opens in new tab" announcement.
- **After:** Links open in new tab, screen readers announce "opens in a new tab". Visual appearance is consistent (violet text).

♿ **Accessibility:**
- Added `sr-only` text for dynamic markdown links.
- Added `aria-label` for static "Visit Website" buttons.

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PR created automatically by Jules for task 9026427752305590526 started by @lightmyfireadmin

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