Smooth 3D hall boot: disable shadows and warm door shaders under the loading overlay.

Keep Loading gallery until Environment and gl.compileAsync finish (with timeouts), GPU-upload painting textures before dismiss, and drop Canvas shadow maps.

Co-authored-by: Cursor <cursoragent@cursor.com>

client/src/components/MovementHallDetails.tsx

@@ -26,7 +26,7 @@ function PalazzoDetails({ width, depth, halfW, halfD, trim }: Props & { trim: st
     <group>
       {pilasterPositions.map(([x, z], i) => (
         <group key={i} position={[x, 0, z]}>
-          <mesh position={[0, 1.8, 0]} castShadow>
+          <mesh position={[0, 1.8, 0]}>
             <boxGeometry args={[0.22, 3.6, 0.22]} />
             <meshStandardMaterial color="#e8dcc8" roughness={0.85} metalness={0.05} />
           </mesh>