Move the wind's Cesium rendering into the Cesium adapter

The particle canvas, its GPU path and the relief shading move unchanged
from src/layers/wind/ to src/globe/cesium/; the adapter reads the Cesium
viewer itself, so the layer no longer hands one in.

scripts/qa-wind-canvas.mjs

@@ -6,7 +6,7 @@ try {
   const page = await browser.newPage();
   await page.goto(`${process.env.QA_BASE_URL || 'http://localhost:4173'}/`, { waitUntil: 'domcontentloaded' });
   const result = await page.evaluate(async () => {
-    const { createWindRendering } = await import('/src/layers/wind/rendering.js');
+    const { createWindRendering } = await import('/src/globe/cesium/windRendering.js');
     const raf = window.requestAnimationFrame; const caf = window.cancelAnimationFrame;
     const callbacks = new Map(); let sequence = 0;
     window.requestAnimationFrame = callback => { callbacks.set(++sequence, callback); return sequence; };