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The sent-message proof was a collapsed <details> under the user bubble: a row of height in every bubble that carried view context, for something that is evidence about the message rather than part of it. It also rendered a blank line, since the bubble is white-space: pre-wrap and the template left a newline before the element. Now a faint eye in the bubble's bottom-right corner, revealing the pairs on hover (on focus for keyboard and touch). Deliberately not expandable, so scrolling back through a conversation cannot grow a second layout, and the popover opens downwards rather than over the message it belongs to. The i18n key stays alive as the mark's aria-label; docs and changelog wording updated to match.