fix(web): balance scene lighting so laid-flat cards don't overexpose

Replace the single dominant top light with evenly-spaced key lightformers
so a laid-flat card's top face isn't blown out and its underside is lifted
by a warm bounce.

apps/web/src/components/viewers/Scene.tsx

@@ -106,8 +106,12 @@ export default function Scene({
         <ambientLight intensity={0.1} />
 
         <Environment resolution={256}>
-          <Lightformer intensity={2} position={[0, 5, 0]} scale={[10, 10, 1]} />
-          <Lightformer intensity={1} color="#b3c7ff" position={[-5, 2, -1]} scale={[3, 3, 1]} />
+          <Lightformer intensity={.5} position={[0, 5, 0]} scale={[10, 10, 1]} />
+          <Lightformer intensity={.5} position={[0, 0, 5]} scale={[10, 10, 1]} />
+          <Lightformer intensity={.5} position={[0, 0, -5]} scale={[10, 10, 1]} />
+          <Lightformer intensity={.5} position={[-5, 0, 0]} scale={[10, 10, 1]} />
+          <Lightformer intensity={.5} position={[5, 0, -0]} scale={[10, 10, 1]} />
+          <Lightformer intensity={0.6} color="#fff1d6" position={[0, -3, 0]} scale={[6, 6, 1]} />
         </Environment>
 
         {shadow && (
@@ -130,7 +134,7 @@ export default function Scene({
 
         <EffectComposer>
           <ToneMapping mode={ToneMappingMode.AGX} />
-          <BrightnessContrast brightness={0.25} contrast={.5} />
+          <BrightnessContrast brightness={0.12} contrast={.5} />
           <Vignette eskil={false} offset={0.25} darkness={0.6} />
         </EffectComposer>
       </Canvas>