Create history pop-up

Or is there a cleaner way to insert ops from history into the set of active ops. Maybe a keyboard shortcut that jumps the cursor to the next empty location, changes the results pane to display the history with an arrow.

History in Sense feels to separated from adding ops.

History should be searchable. :)

The issue names no files, tests, or entry points. Start by tracing how history and active operations are represented, then determine whether the intended scope is searchable history, keyboard navigation, or inserting a history item into active operations. Done should include an agreed interaction design and tests for the selected behavior.

Written by the indexing model from the issue text.