Animations consistently get stuck in some scenarios

[expede]

Summary

Problem

The CLI's animations (e.g. clock ticking as a "working" indicator) become frozen, or fail to erase when complete.

Impact

It's mainly annoying / feels unpolished

Solution

Diagnose and fix the animation to run consistently, not pause, erase clock the end.

Detail

For example:

Desktop (please complete the following information):

• OS: macOS 11.3
• CLI version: 2.10.x, 2.11.x, 2.12.0
• Terminal: iTerm2 3.4.4, fish 3.1.2