fix(08-01): reduce error overlay opacity

- Changed from 70% to 40% opacity
- Allows previous output to show through better

src/components/nodes/GenerateImageNode.tsx

@@ -555,7 +555,7 @@ export function GenerateImageNode({ id, data, selected }: NodeProps<NanoBananaNo
               )}
               {/* Error overlay when generation failed */}
               {nodeData.status === "error" && (
-                <div className="absolute inset-0 bg-red-900/70 rounded flex flex-col items-center justify-center gap-1">
+                <div className="absolute inset-0 bg-red-900/40 rounded flex flex-col items-center justify-center gap-1">
                   <svg
                     className="w-6 h-6 text-red-400"
                     fill="none"

src/components/nodes/GenerateVideoNode.tsx

@@ -360,7 +360,7 @@ export function GenerateVideoNode({ id, data, selected }: NodeProps<GenerateVide
             )}
             {/* Error overlay when generation failed */}
             {nodeData.status === "error" && (
-              <div className="absolute inset-0 bg-red-900/70 rounded flex flex-col items-center justify-center gap-1">
+              <div className="absolute inset-0 bg-red-900/40 rounded flex flex-col items-center justify-center gap-1">
                 <svg
                   className="w-6 h-6 text-red-400"
                   fill="none"