Un Paris en voxels fourmillant de détails

Build a single self-contained three.js HTML page that renders a 14-second animation (1280x720, 30fps, deterministic: expose window.renderAt(t) so every frame can be captured).  Scene: a floating voxel diorama island - Paris, 1888, the Eiffel Tower under construction. Everything is already moving on frame 1.  Island: - floating chunk with layered rock underside, the Seine curving across the front with stone quays and an arched bridge - Champ de Mars: dirt work yard, stacks of iron girders, wooden sheds, a steam engine with a smoking chimney - around it: rows of Haussmann buildings with cream walls, grey zinc roofs, chimneys, tiny trees along the boulevards  The tower (the hero): - dark reddish-brown wrought iron lattice made of thin voxel beams with real X-bracing, not solid blocks - four curved legs and the first platform finished, the second level half built, the top section only a skeleton - wooden scaffolding towers under the legs, small creeper cranes on the structure lifting girders on chains - glowing orange rivet sparks where workers hammer, small puffs of steam  Life (hundreds of tiny voxel people, ~3 voxels tall): - riveting teams on every level with hammers swinging, workers walking along beams - girders hoisted by cranes swinging slowly into place - horse-drawn carts carrying iron across the yard, crowds of onlookers in 1880s clothes with top hats and parasols - a riverboat with a smoking funnel moving along the Seine, carriages crossing the bridge, pigeons circling the tower  Camera and look: - wide view of the whole island, slow orbit (~25 degrees) with a gentle push-in toward the tower - warm late-afternoon sun, soft shadows, ambient occlusion, light haze, rounded voxels, ACES tone mapping, soft bloom on sparks

Full credits go to @semichenkko for this prompt