🎨 Palette: Add ARIA attributes to collapsible email panels

[schmug]

💡 What: Added aria-expanded and aria-controls attributes to the buttons responsible for expanding and collapsing the SecurityVerdictPanel and ThreadMessage components. Also assigned an explicit id to the corresponding collapsible content wrappers.
🎯 Why: To improve accessibility for screen readers, allowing users to understand the current expansion state and linking the toggle control to the specific content region.
♿ Accessibility: Implements standard WAI-ARIA collapsible pattern.

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PR created automatically by Jules for task 7291009029056155849 started by @schmug

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	ais-hub	f883a0a	Commit Preview URL Branch Preview URL	May 21 2026, 05:48 AM