Accept a total of `0` for a progress bar and behave well in this case.

Metadata

Project: craft-cli
Number: #350
Type: issue
State: open
Author: lengau
Labels: Status: Triaged Type: Enhancement
Created: 2025-06-25 17:35:50+00:00
Updated: 2025-06-25 17:37:07+00:00
Closed: —

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Issue body

### What needs to get done When using a progress bar, accept a total of 0 and provide some sort of acceptable output that indicates we don't know the total progress. ### Why it needs to get done We sometimes want to use a progress bar but aren't sure what the total will be.

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