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 existing four-loop app. Add occasional sounds from the supplied assets folder, including a bell, a bird and a water sound. Each event needs enabled, level, shortest wait and longest wait. Enabled and playing now must look different. An event plays once. Choose a random wait after it ends, so one event does not overlap itself. Different event sources can overlap. Let me trigger one now and add or remove event sources while loops continue. Disabling or removing stops that source and cancels its pending triggers. Global stop stops everything and no event can come back afterwards. Show duration before play. Preserve the original loop controls.