Information about special units / modernisations / districts from civilization screen

When clicking on a leader in-game in the top right, I get an overview of the civilization they play. But the special units and modernisations and districts are only displayed, without any stats.
It would be nice if the information about special stuff could be inlined or linked somehow or shown on hover, so I don't have to look it up if I want to see the actual differences.

Start at the civilization screen's leader overview, specifically the panel that lists special units, modernisations, and districts. Trace how those entries are rendered and how their existing details are represented elsewhere in the UI. Done means each listed item exposes its relevant stats inline, through a link, or on hover without requiring an external lookup.

Written by the indexing model from the issue text.