style(ux): improve grimoire empty state in table

[myarichuk]

💡 What: Improved the "Recent Archives" empty state on the Dashboard by replacing plain italicized text with a structured empty state containing an icon, heading, and descriptive text.
🎯 Why: Enhances UX by making empty lists immediately recognizable and providing clear guidance on the next step.
♿ Accessibility: The empty state maintains proper table structure and is easier to read than low-contrast text.

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PR created automatically by Jules for task 2653114429141057429 started by @myarichuk

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