fix(editor): harden editor interactions and WebGPU rendering

Fix editor bug sweep regressions, WebGPU CSG/material crashes, Shift snap bypass behavior, arrow handle drag projection, and the wall preview null guard covered by the Sentry follow-up PRs.

packages/nodes/src/cupola/move-tool.tsx

@@ -66,7 +66,10 @@ export default function MoveCupolaTool({ node }: { node: CupolaNode }) {
 
       const sx = Math.round(target.localX * 20) / 20
       const sz = Math.round(target.localZ * 20) / 20
-      if (!lastSnap || lastSnap[0] !== sx || lastSnap[1] !== sz) {
+      if (
+        event.nativeEvent?.shiftKey !== true &&
+        (!lastSnap || lastSnap[0] !== sx || lastSnap[1] !== sz)
+      ) {
         triggerSFX('sfx:grid-snap')
         lastSnap = [sx, sz]
       }

packages/nodes/src/cupola/tool.tsx

@@ -64,7 +64,7 @@ const CupolaTool = () => {
       const sx = Math.round(wx * 20) / 20
       const sz = Math.round(wz * 20) / 20
       const prev = lastSnapRef.current
-      if (!prev || prev[0] !== sx || prev[1] !== sz) {
+      if (event.nativeEvent?.shiftKey !== true && (!prev || prev[0] !== sx || prev[1] !== sz)) {
         triggerSFX('sfx:grid-snap')
         lastSnapRef.current = [sx, sz]
       }