Show a proxy count of images processed in a collection

[mihow]

Adds a count in the collections list to show how many captures have any detections. This is a simple estimate of the number of "processed" images in a collection until we have a true way to determine that.

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Lighthouse	1 paths audited Performance: 31 Accessibility: 89 Best Practices: 92 SEO: 100 PWA: 80 View the detailed breakdown and full score reports

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