Scheduled message delivery

[skitterm]

Description

As a message sender, I want to be able to defer delivery of a message, so that I can send a message when convenient for me, and the recipient can receive when convenient for them.

Tasks

• Determine if possible to defer sending a message (plain old server code, or service worker, or some 3rd-party lib?)
• Very basic time picker (3rd-party)
• Read time picker values from recipient's time zone
• Kick off "wait to send" process
• When time expires, send message to user
• Show pending message in own chat
• Scheduled message shows delivered time as its time
• Send message in user's own time zone (relative to the picker)

Acceptance criteria

• Draft message displays time-picker
• Time picker values are in time zone of recipient
• Selecting time defers sending message until that time
• When time hits, message is delivered
• Correct time is sent (the actual received time) instead of the original time drafted