refactor(server/api): migrate library/suggestions/radio/home preludes (A2 4/N)

internal/api/library.go

@@ -4,7 +4,6 @@ import (
 	"errors"
 	"net/http"
 
-	"github.com/go-chi/chi/v5"
 	"github.com/jackc/pgx/v5"
 	"github.com/jackc/pgx/v5/pgtype"
 
@@ -119,14 +118,12 @@ func (h *handlers) handleGetArtist(w http.ResponseWriter, r *http.Request) {
 // as a flat list. Used by ArtistCard's play affordance, which shuffles
 // client-side. 404 when the artist doesn't exist.
 func (h *handlers) handleGetArtistTracks(w http.ResponseWriter, r *http.Request) {
-	id, ok := parseUUID(chi.URLParam(r, "id"))
+	id, ok := requireURLUUID(w, r, "id")
 	if !ok {
-		writeErr(w, apierror.BadRequest("bad_request", "invalid artist id"))
 		return
 	}
-	user, ok := auth.UserFromContext(r.Context())
+	user, ok := requireUser(w, r)
 	if !ok {
-		writeErr(w, apierror.ErrUnauthorized)
 		return
 	}
 	q := dbq.New(h.pool)