Improve small span display on flame graph

[ccschmitz]

Summary

Tweaks the display of really small spans on the trace flame graph.

• Sets a minimum width for a span on the flame graph to make it easier to see and interact with spans that have a very short duration.
• Fixes the duration display for spans that report a 0 duration.

The previews below are looking at this trace for reference.

Before

After

How did you test this change?

Click tested some traces in prod and contrasted them with the PR preview for the same trace (see before and after above).

Are there any deployment considerations?

N/A - client-side change only.

Does this work require review from our design team?

Will review the changes w/ Julian before merging.

[linear]

HIG-4473 Trace duration calculated incorrectly

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Latest commit: 56550a7

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[SpennyNDaJets]

I like it!