Refine tool call summaries and scrolling (#2069)

* feat(app): refine tool call summaries and scrolling

Keep summary groups stable from the first tool call, preserve live activity feedback, and scroll expanded groups to the latest entry. Consolidate web scrollbar styling around the native browser mechanism.

* refactor(app): reuse tool call height constant

* fix(app): preserve tool call summary state

* fix(app): refresh web tool groups on expand

* fix(app): preserve grouped tool errors

packages/app/src/components/ui/context-menu.tsx

@@ -40,7 +40,6 @@ import {
 } from "@/components/ui/isolated-bottom-sheet-modal";
 import { FloatingScrollView, FloatingSurface } from "@/components/ui/floating";
 import { isWeb, isNative } from "@/constants/platform";
-import { useWebScrollbarStyle } from "@/hooks/use-web-scrollbar-style";
 
 // Keep parity with dropdown-menu action statuses.
 export type ActionStatus = "idle" | "pending" | "success";
@@ -389,7 +388,6 @@ export function ContextMenuContent({
   const { t } = useTranslation();
   const context = useContextMenuContext("ContextMenuContent");
   const { theme } = useUnistyles();
-  const webScrollbarStyle = useWebScrollbarStyle();
   const isMobile = useIsCompactFormFactor();
   const useMobileSheet = isMobile && mobileMode === "sheet";
   const { open, setOpen, triggerRef, anchorRect } = context;
@@ -579,7 +577,6 @@ export function ContextMenuContent({
           <FloatingScrollView
             bounces={false}
             showsVerticalScrollIndicator
-            style={webScrollbarStyle}
             contentContainerStyle={SCROLL_CONTENT_CONTAINER_STYLE}
           >
             {children}

packages/app/src/components/ui/dropdown-menu.tsx

@@ -31,7 +31,6 @@ import { StyleSheet, useUnistyles } from "react-native-unistyles";
 import { Check, CheckCircle } from "lucide-react-native";
 import { FloatingScrollView, FloatingSurface } from "@/components/ui/floating";
 import { Tooltip, TooltipContent, TooltipTrigger } from "@/components/ui/tooltip";
-import { useWebScrollbarStyle } from "@/hooks/use-web-scrollbar-style";
 import { isWeb } from "@/constants/platform";
 import { useDismissKeyboardOnOpen } from "@/components/ui/keyboard-dismiss";
 
@@ -448,7 +447,6 @@ export function DropdownMenuContent({
     useDropdownMenuContext("DropdownMenuContent");
   const [modalVisible, setModalVisible] = useState(false);
   const surfaceNativeID = useId();
-  const webScrollbarStyle = useWebScrollbarStyle();
   const [closing, setClosing] = useState(false);
   const [triggerRect, setTriggerRect] = useState<Rect | null>(null);
   const [contentSize, setContentSize] = useState<Size | null>(null);
@@ -603,8 +601,8 @@ export function DropdownMenuContent({
     align,
   ]);
   const scrollViewportStyle = useMemo(
-    () => [webScrollbarStyle, visibleContentSize ? { height: visibleContentSize.height } : null],
-    [visibleContentSize, webScrollbarStyle],
+    () => [visibleContentSize ? { height: visibleContentSize.height } : null],
+    [visibleContentSize],
   );
 
   if (!modalVisible) return null;