Merge pull request 'fix(auth): typed context keys and real sentinel errors' (#4) from devin/1776538999-fix-auth-context-keys-and-errors into master

backend/api/rest/features.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"net/http"
 
+	"github.com/explorer/backend/api/middleware"
 	"github.com/explorer/backend/featureflags"
 )
 
@@ -16,11 +17,8 @@ func (s *Server) handleFeatures(w http.ResponseWriter, r *http.Request) {
 	}
 
 	// Extract user track from context (set by auth middleware)
-	// Default to Track 1 (public) if not authenticated
-	userTrack := 1
-	if track, ok := r.Context().Value("user_track").(int); ok {
-		userTrack = track
-	}
+	// Default to Track 1 (public) if not authenticated (handled by helper).
+	userTrack := middleware.UserTrack(r.Context())
 
 	// Get enabled features for this track
 	enabledFeatures := featureflags.GetEnabledFeatures(userTrack)