🎨 Palette: Add form labels to ComposePanel

[schmug]

💡 What: Added proper htmlFor attributes to labels and matching id attributes to input fields in the Compose Email panel.
🎯 Why: Forms without properly associated labels trigger accessibility warnings and can degrade the experience for screen reader users and prevent users from simply clicking labels to focus the correct input.
♿ Accessibility: Ensures that To, CC, BCC, and Subject fields are properly identifiable and accessible to assistive technologies.

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PR created automatically by Jules for task 16983866211019270554 started by @schmug

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	ais-hub	717eba9	Commit Preview URL Branch Preview URL	May 22 2026, 05:42 AM