dashboard: an entry's menu in the document box

The document box edited an entry by a double-click and added to a map
or list by the `+` on its row; a key couldn't be renamed, and a list's
`+` always asked for an index.

A right-click on an entry, or a finger held on it half a second, opens
its menu: `Edit value` (as the double-click), `Rename key` for a map's
key, and on a map `Add a key`, on a list `Append an item` or `Insert
an item at…`. Renaming reads the value, writes it under the new key
and deletes the old one (two writes, the value as JSON; a key that
exists already isn't overwritten). Inside a field being edited, and
where an entry offers nothing, the browser's own menu shows.

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