fix: improve desktop scroll-to-refresh UX

- Add wheel delta accumulator with -50 threshold to prevent accidental refreshes
- Desktop now shows same animated refresh indicator as mobile
- Visual feedback scales smoothly with scroll amount (0.8x multiplier)
- Accumulator resets when scrolling away from top
Co-authored-by: Anthony <AnthonyRonning@users.noreply.github.com>

Author: github-actions[bot]

frontend/src/components/ChatHistoryList.tsx

@@ -89,6 +89,7 @@ export function ChatHistoryList({
 constpullStartY=useRef(0);
 constisPulling=useRef(false);
 constpullDistanceRef=useRef(0);
+constwheelDeltaAccumulator=useRef(0);
 
 // Fetch initial conversations from API using the OpenSecret SDK
 const{ isPending, error }=useQuery({
@@ -287,6 +288,8 @@ export function ChatHistoryList({
 };
 
 // Desktop: detect scroll up when already at top (overscroll)
+constWHEEL_THRESHOLD=-50;// Require accumulated scroll before triggering
+
 consthandleWheel=(e: WheelEvent)=>{
 if(!isDesktopPlatform||isPullRefreshing)return;
 
@@ -297,8 +300,27 @@ export function ChatHistoryList({
 if(container.scrollTop===0&&e.deltaY<0){
 // Prevent default to avoid browser overscroll bounce
 e.preventDefault();
-// Trigger refresh on upward scroll attempt
-handleRefresh();
+
+// Accumulate wheel delta to require sustained scroll
+wheelDeltaAccumulator.current+=e.deltaY;
+
+// Update pull distance for visual feedback (map wheel delta to pull distance)
+constvisualDistance=Math.min(Math.abs(wheelDeltaAccumulator.current)*0.8,80);
+pullDistanceRef.current=visualDistance;
+setPullDistance(visualDistance);
+
+// Trigger refresh if threshold is reached
+if(wheelDeltaAccumulator.current<=WHEEL_THRESHOLD){
+wheelDeltaAccumulator.current=0;
+handleRefresh();
+}
+}else{
+// Reset accumulator and visual feedback if not at top or scrolling down
+wheelDeltaAccumulator.current=0;
+if(pullDistanceRef.current>0){
+pullDistanceRef.current=0;
+setPullDistance(0);
+}
 }
 };