Added
- Letters -- a Wii Mail-inspired inbox for sending decorated letters to friends, complete with custom stationery, hand-drawn stickers, emoji stickers, fonts, and a send animation with envelope and wax seal
- Attach a color moment or theme to your letter as a gift -- recipients can tap to apply it instantly
- Stationery picker pulls from your color moments, followed users' themes, and built-in presets
- Freehand drawing canvas for creating one-of-a-kind sticker doodles
- Letters page added to the sidebar with a custom mailbox icon