[Feature Request] Add ability to parse timestamps that are stored as floats

## Description

In some cases we store timestamps as simple float values rather than as a datetime object. It'd be nice to have the option for the UI to render these timestamps as a Date.

## Preferred Solution

If a unix timestamp is identified, parse it into a datetime object. This could show UTC time at first, or use the time zone identified by the browser.

## Additional Context

With the 3.0 release, these are shown like this:

## Related Issues

## Tasks

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No file or test is named in the issue. Start by locating the UI code that renders timestamp values and determine how float Unix timestamps are currently displayed. Done means recognized Unix timestamps render as dates, with the chosen UTC or browser-time-zone behavior covered by the relevant tests.

Written by the indexing model from the issue text.