Build a cozy rainy-night lo-fi room in the browser (Three.js, single HTML page, no external assets). A tiny isometric bedroom diorama: rain streaks down the window over a glowing city, a cat sleeps on the desk and its tail flicks, steam rises from a mug, a record player spins, desk lamp light flickers, and a lo-fi beat is generated in code. Slowly orbits on its own; drag to look around. It should feel cozy the moment it loads.