I'm a product design student. I'm not familiar with the terminal or writing code. Please build this for me with HTML, CSS, JavaScript and native Web Audio. Make a simple, usable browser page, with no external libraries or internet services. Sound should start only after I click. Use comfortable initial levels. I need to play with the result, not read code. Extend the filtered noise app with a volume envelope. Let me set attack, how long the noise takes to fade in, and release, how long it takes to fade out after stop. Keep the source level separate. Add an obvious start and release action and a global stop. Repeated starts and stops must not leave extra sound running. Show the envelope shape. I want a soft swell rather than a click.