fix: Chrome diff scroll in All Files layout (#213)

Replace nested ScrollableOverlay with simple div in inline diff to fix vertical scroll blocking in Chrome. Add explicit h-full to stacked view flex container and disableHorizontal to main ScrollableOverlay for proper scroll behavior.

packages/ui/src/components/views/PierreDiffViewer.tsx

@@ -482,19 +482,16 @@ export const PierreDiffViewer: React.FC<PierreDiffViewerProps> = ({
   }
 
   // Fallback for 'inline' layout: use Portal behavior
+  // Use simple div with overflow-x-auto to avoid nested ScrollableOverlay issues in Chrome
   return (
     <div className={cn("relative", "w-full")}>
-      <ScrollableOverlay
-        outerClassName="pierre-diff-wrapper w-full"
-        disableHorizontal={false}
-        fillContainer={false}
-      >
+      <div className="pierre-diff-wrapper w-full overflow-x-auto overflow-y-visible">
         <FileDiff
           fileDiff={fileDiff}
           options={options}
           selectedLines={selection}
         />
-      </ScrollableOverlay>
+      </div>
       
       {selection && createPortal(
         <div