The history-store SSE handler only refreshed the current history. With
polling disabled under enable_sse_updates=true, other histories visible
in the multi-history view stayed stale until the user switched into
them. Iterate over all changed history ids in the SSE event and refresh
each one already tracked in storedHistories via updateContentStats and
historyItemsStore.fetchHistoryItems, so multi-view panels for
non-current histories pick up uploads as they happen.
Adds an integration_selenium test that uploads to a non-current history
through the API and asserts the new item renders in the multi-view
without a current-history switch — exercising the SSE-driven refresh
path end-to-end.
mvdbeek
e8c16e698b