Fix z-index for validation

Author: j-sanaa

packages/agentflow/src/Agentflow.tsx

@@ -267,7 +267,7 @@ function AgentflowCanvas({
                                 position: 'absolute',
                                 left: showDefaultPalette ? 70 : 20, // 70px offset = ~10px gap between buttons
                                 top: 20,
-                                zIndex: 1001
+                                zIndex: 10
                             }}
                         >
                             <IconSparkles />
@@ -276,7 +276,7 @@ function AgentflowCanvas({
 
                     {/* Canvas action buttons - positioned at top right */}
                     {!readOnly && (
-                        <div style={{ position: 'absolute', right: 20, top: 20, zIndex: 1001, display: 'flex', gap: 8 }}>
+                        <div style={{ position: 'absolute', right: 20, top: 20, zIndex: 10, display: 'flex', gap: 8 }}>
                             <ValidationFeedback
                                 nodes={nodes as FlowNode[]}
                                 edges={edges as FlowEdge[]}