Temporary Popup Slice 2: add the ability to view the panel using the snap of the last run

[twschiller]

[This issue was auto-generated using ProductBoard.]

Draft specification: https://www.notion.so/pixiebrix/Ephemeral-Temporary-Document-Renderer-acd663a90fb64444ae372404ea6bda8a

• Slice 2: add the ability to view the panel using the snap of the last run

  • In the Preview pane of the data panel, add a “Preview from Snapshot” button

  • On click, send a message to the content script with the 1) brick definition, and 2) latest snapshot of data. (See existing preview code)

[twschiller]

Link to subfeature: https://pixiebrix.productboard.com/feature-board/planning/features/15729085

[corinnemayans]

Duplicate. Going to use the one more recently generated by ProductBoard because that one is linked properly. #4621