Add task steps — Sales sequence task panel for Seequence

Seequence, a small panel for working through a sales sequence, here one called Warm lead, with progress shown at the top.

Each task is one line: a channel icon (email, call, LinkedIn, Twitter), the task, a comment icon and a due date. Add sequence task opens a menu of task types, from emails and SMS to meetings and custom tasks. Finished tasks are struck through and get a green Done chip, while late ones show Overdue in red. Clicking a status lets you undo it, mark it in progress or change the due date, and the sequence menu can replace or delete the sequence.