fix(chat): define missing suggestionChipStyle constant

vibn-frontend/components/vibn-chat/chat-panel.tsx

@@ -952,6 +952,18 @@ function ProjectPreviewChatInputWrap({
   );
 }
 
+const suggestionChipStyle: React.CSSProperties = {
+  background: "#f4f4f5",
+  border: "1px solid #e4e4e7",
+  borderRadius: 16,
+  padding: "4px 10px",
+  fontSize: "0.72rem",
+  color: "#52525b",
+  cursor: "pointer",
+  whiteSpace: "nowrap",
+  transition: "all 0.1s ease",
+};
+
 export function ChatPanel({
   structural = false,
   artifactSlot,