Fix mobile sidebar swipe and drag failures (#2709)

* fix(app): prevent text selection during Android swipes

Gesture interception did not cancel the native view where the touch began, leaving Android's pending text-selection action alive.

* fix(app): restore iOS sidebar close swipes

Fabric could fail to attach close handlers when their target lived inside retained but display-hidden panel content. Keep a registered native gesture host mounted outside the presentation wrapper so close swipes work over nested lists without activating rows.

* fix(app): recover sidebar drags after cancellation

Cancelled native drags could leave a lifted row and the shared outer list locked. Scope terminal cleanup to the owning gesture session and release the lock on cancellation or unmount.

* test(app): clean up partial drag fixtures

packages/app/src/components/left-sidebar.tsx

@@ -55,6 +55,7 @@ import { usePanelStore } from "@/stores/panel-store";
 import { useOwnsWindowChromeCorner, WindowChromeSafeArea } from "@/utils/desktop-window";
 import { useCloseAgentListGesture } from "@/mobile-panels/gestures";
 import { MobilePanelOverlay } from "@/mobile-panels/presentation";
+import { useIsMobilePanelPresented } from "@/mobile-panels/provider";
 import {
   buildOpenProjectRoute,
   buildNewWorkspaceRoute,
@@ -619,6 +620,7 @@ function MobileSidebar({
   const isSessionsActive = pathname.includes("/sessions");
   const isSchedulesActive = pathname.includes("/schedules");
   const { gesture: closeGesture, gestureRef: closeGestureRef } = useCloseAgentListGesture();
+  const dragGestureHostPresented = useIsMobilePanelPresented("agent-list");
 
   const handleViewMore = useCallback(() => {
     closeSidebar();
@@ -714,6 +716,7 @@ function MobileSidebar({
             onWorkspacePress={handleWorkspacePress}
             onAddProject={handleOpenProject}
             parentGestureRef={closeGestureRef}
+            dragGestureHostPresented={dragGestureHostPresented}
             listHeaderComponent={workspacesSectionHeaderElement}
           />
         )}