I would say “Lexique des règles typographiques en usage à l’Imprimerie nationale”

what are some book, magazine or journal publishers that are known to
pay special attention to good typography and typesetting?

“Le journal officiel” or any official public document that is marked “cerfa” for “Centre d’enregistrement et de révision des formulaires administratifs”

Le bon usage, by Maurice Grevisse is a comprehensive resource for teachers of French, authors, translators and editors.

J. André with Petites leçons de typographie, offers a very useful booklet.
L’orthotypographie (typographical syntax) de J. Lacroux combines orthography and typography.

These are the main references I use on a regular basis.