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. Build a granular sound app using a local Forest or Water loop in ../../assets/audio/. Split the recording into short grains. Let me control grain length, density in grains per second, playback rate and position in the recording. Include position spread, play/stop and level. Give me a clear original-sample comparison. Include a gentle cloud setting and a more scattered setting. Avoid sharp clicks at grain edges. I want it to become an evolving atmospheric material, not just a technical test.