Let the web demo use HDF EFFECT instead of greying it out

docker/frontend/src/App.tsx

@@ -701,8 +701,8 @@ export function Workspace() {
         value: def.display(value),
         active: openParam === def.key,
         amberValue: openParam !== def.key && value !== def.defaultValue,
-        pro: def.pro && !user,
-        disabled: !!def.pro && !user,
+        // The web build is the demo: HDF EFFECT is part of what it shows off,
+        // so no knob is held back here. The PRO gate stays a phone-build rule.
         onClick: () => toggleParam(def.key),
       };
     });