fix auth refresh endpoint and quiet expected 401 on profile check

frontend/src/lib/hooks/useAuth.tsx

@@ -107,8 +107,16 @@ export function AuthProvider({ children }: { children: React.ReactNode }) {
           setCurrentOrganization(null);
         }
       }
-    } catch (err) {
-      console.error('Auth check failed:', err);
+    } catch (err: unknown) {
+      const status =
+        (err as { statusCode?: number })?.statusCode ??
+        (err as { response?: { status?: number } })?.response?.status;
+
+      // 401 on profile is expected when there is no session — not an application error.
+      if (status !== 401) {
+        console.error('Auth check failed:', err);
+      }
+
       // Only clear state — DO NOT redirect here
       setUser(null);
       setOrganizations([]);