Chat App - Scheduled Messages

Create a real-time chat app.

See language/*.md for language-specific setup, architecture, and constraints.

UI Requirements

Use SpacetimeDB brand styling (dark theme).

Features

Basic Chat Features

• Users can set a display name
• Users can create chat rooms and join/leave them
• Users can send messages to rooms they've joined
• Show who's online
• Include reasonable validation (e.g., don't let users spam, enforce sensible limits)

Typing Indicators

• Show when other users are currently typing in a room
• Typing indicator should automatically expire after a few seconds of inactivity
• Display "User is typing..." or "Multiple users are typing..." in the UI

Read Receipts

• Track which users have seen which messages
• Display "Seen by X, Y, Z" under messages (or a seen indicator)
• Update read status in real-time as users view messages

Unread Message Counts

• Show unread message count badges on the room list
• Track last-read position per user per room
• Update counts in real-time as new messages arrive or are read

Scheduled Messages

• Users can compose a message and schedule it to send at a future time
• Show pending scheduled messages to the author (with option to cancel)
• Message appears in the room at the scheduled time