v4: the followed feed's two views are pages — "From people" and "From playlists" on a feed's "follow" tab were a state of the page, which a reload, Back or a shared link lost, while a profile's same split is /@name/follow/playlists. They are now /follow and /follow/playlists, and /music/follow/playlists in a category, feedPath taking the view as userPath does (FOLLOW_VIEWS); picking a category keeps it. Their dumps come from GET /api/dumps?follow=users|playlists, signed in, which the feed's word for it names, instead of GET /api/me/feed?from=; an unknown category is a 404 there, as on the rest of the feed, rather than an empty list.

A feed's tab, as a profile's, a search's or the community page's, now takes the place of the current history entry, since it is a view of the same page; picking a category, another page, still adds one.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

api/services/category-service.ts

@@ -131,8 +131,8 @@ export function getCategoryIdBySlug(
  * Returns the id of the category of `kind` whose slug the `name` parameter of
  * `params`, `?category=` by default, gives, undefined without one, or
  * "missing" when it names none, so that the list comes back empty rather than
- * unfiltered. The follows routes filter the index's "followed" tab with it,
- * the users routes a profile's lists, and the search route its results.
+ * unfiltered. The users routes filter a profile's lists with it, and the
+ * search route its results.
  */
 export function resolveCategoryFilter(
   kind: CategoryKind,