fix: Remove tool bottom border (#53)

Author: nzakas

src/App.tsx

@@ -23,7 +23,7 @@ function App() {
 								}}
 							/>
 							<div className="bg-foreground/5 overflow-auto h-[70dvh] sm:h-full relative flex flex-col">
-								<div className="flex sm:items-center flex-col sm:flex-row justify-between p-4 gap-2 z-10 border-b">
+								<div className="flex sm:items-center flex-col sm:flex-row justify-between p-4 gap-2 z-10">
 									<ToolSelector />
 									<div className="flex items-center gap-1">
 										{activeTool.options.map(