Components: Display and feedback #20

REQUIREMENTS §22 (Display and feedback), §25.5.

• Description list
• Status badge
• Tag / chip
• Avatar (UserAvatar, Thaana-aware initials)
• Avatar group (UserAvatarGroup)
• Keyboard key (KeyboardKey)
• Alert (Callout)
• Notice
• Announcement bar
• Cookie consent
• Toast (Toaster, toast)
• Conditional link
• Conditional display
• Publish box
• Last edited by
• Relative date (§25.5, test per bullet)
• Countdown
• Activity feed
• Comment thread
• Icon with text
• Share buttons
• Print and back buttons
• Calendar (MiniCalendar)
• Notes
• Content card
• Error pages (403, 404, 500, maintenance)

Merged into claude/amazing-cerf-htnpm8. Coverage 99.2% lines / 95.9% branches.

Follow-ups:

• Figma components + Code Connect (Figma kit & token sync #29)
• Share buttons: brand logos (Lucide/FA Free solid have none; icons prop available)