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Issue 2176: Make the labelled edit icons keyboard operable

The alt text added for the pencil icons marked them as role="button" and
gave them a tab stop, but nothing activated them from the keyboard and
most were hidden in a way that kept them out of the tab order entirely.

Add a keyboardActivate directive that activates role="button" elements on
enter and space by dispatching a click, which also reaches the handler
when it sits on an ancestor, as it does for the email workflow rules.

Reveal the hover-only icons on focus as well as hover. They were hidden
with display: none and visibility: hidden, neither of which leaves an
element focusable, so hide them with opacity instead.

The pencil in the custom action list sits outside the element carrying
the click handler, so mark it decorative and label that element instead.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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