Article editor no longer empties out on reload or language switch

Two related bugs were hurting the article editing flow in subtle ways.

The first: if you reloaded the page while editing an article, the editor occasionally booted into an empty state even though your content was safely in the database. A retry usually loaded the article, but the half-second of "wait, did I lose my work?" was real and bad.

The second: switching the article's locale (say, from English to your Spanish translation) sometimes flashed the editor to empty before populating the translated content.

Both are fixed in this release. The editor now waits for the article to actually finish loading before rendering its empty-state copy, and locale switches preserve the editor state correctly while the translation loads.