🎨 Palette: Add Tooltips to Social Badges

[google-labs-jules]

💡 What: Added title attributes to the social media badges (ORCID, Mastodon, Bluesky) in the README.md.

🎯 Why: This provides a helpful tooltip when a user hovers over the badges, offering immediate context about where the link leads. It creates a more consistent and delightful user experience, as other images in the README already used this pattern.

📸 Before/After: This is a non-visual change and only adds a tooltip on hover.

♿ Accessibility: While the primary accessibility for these images is handled by their alt text, the added tooltips provide a supplementary layer of context for sighted mouse users.

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PR created automatically by Jules for task 11098245996967294234 started by @Moohan

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