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/HallPassage.tsx

@@ -46,14 +46,14 @@ export default function HallPassage({
 
       {/* Side jambs */}
       {([-1, 1] as const).map((sign) => (
-        <mesh key={sign} position={[sign * (openingW / 2 + jamb / 2), openingH / 2, faceZ]} castShadow>
+        <mesh key={sign} position={[sign * (openingW / 2 + jamb / 2), openingH / 2, faceZ]}>
           <boxGeometry args={[jamb, openingH + 0.1, 0.1]} />
           <meshStandardMaterial color={trimColor} roughness={0.45} metalness={0.25} />
         </mesh>
       ))}
 
       {/* Arch header */}
-      <mesh position={[0, openingH + 0.06, faceZ]} castShadow>
+      <mesh position={[0, openingH + 0.06, faceZ]}>
         <boxGeometry args={[openingW + jamb * 2, 0.14, 0.1]} />
         <meshStandardMaterial color={trimColor} roughness={0.4} metalness={0.3} />
       </mesh>