feat: kind 30030 emoji pack card rendering

[barrydeen]

Summary

• Render rich preview cards for kind 30030 emoji packs embedded via naddr in notes, DMs, group chats, and notifications
• Cards display pack title, emoji grid preview (up to 15 emojis), author info with profile picture, and emoji count
• Add/Remove button integrates with existing custom emoji system (ListCrudManager.addSetToEmojiList/removeSetFromEmojiList)
• Button provides immediate visual feedback on click via local state
• Badge uses user's selected theme accent color

Test plan

• Embed a nostr:naddr1... referencing a kind 30030 emoji set in a note from another client
• Verify card renders in feed with emoji previews, title, author, and Add button
• Click "Add" → verify button switches to "Added ✓" and emojis appear in emoji picker
• Click "Added ✓" → verify it reverts to "Add"
• Verify card renders with Add button in DMs, group chats, and notifications
• Verify card renders in search results and thread view
• Test with packs containing >15 emojis to verify "+N more" label