Remove dead code and fix sidebar split/tab navigation conflict

- Remove unused `nowTick` state variable from ChatView
- Remove unused `terminalFocusRequestId` state variable from ChatView
- Delete unused `WorkspaceRouteSync` component
- Remove redundant router.navigate() calls from sidebar split/tab context menu handlers that conflicted with route-level openThreadSurface("focus-or-tab")

Author: cursoragent

apps/web/src/components/ChatView.tsx

@@ -498,8 +498,6 @@ export default function ChatView(props: ChatViewProps) {
   // When set, the thread-change reset effect will open the sidebar instead of closing it.
   // Used by "Implement in a new thread" to carry the sidebar-open intent across navigation.
   const planSidebarOpenOnNextThreadRef = useRef(false);
-  const [terminalFocusRequestId, setTerminalFocusRequestId] = useState(0);
-  const [nowTick, setNowTick] = useState(() => Date.now());
   const [pullRequestDialogState, setPullRequestDialogState] =
     useState<PullRequestDialogState | null>(null);
   const [attachmentPreviewHandoffByMessageId, setAttachmentPreviewHandoffByMessageId] = useState<

apps/web/src/components/Sidebar.tsx

@@ -1654,28 +1654,16 @@ const SidebarProjectItem = memo(function SidebarProjectItem(props: SidebarProjec
 
       if (clicked === "open-new-tab") {
         openThreadInNewTab(serverThreadSurfaceInput(threadRef));
-        void router.navigate({
-          to: "/$environmentId/$threadId",
-          params: buildThreadRouteParams(threadRef),
-        });
         return;
       }
 
       if (clicked === "open-split-right") {
         openThreadInSplit(serverThreadSurfaceInput(threadRef), "x");
-        void router.navigate({
-          to: "/$environmentId/$threadId",
-          params: buildThreadRouteParams(threadRef),
-        });
         return;
       }
 
       if (clicked === "open-split-down") {
         openThreadInSplit(serverThreadSurfaceInput(threadRef), "y");
-        void router.navigate({
-          to: "/$environmentId/$threadId",
-          params: buildThreadRouteParams(threadRef),
-        });
         return;
       }
 
@@ -1729,7 +1717,6 @@ const SidebarProjectItem = memo(function SidebarProjectItem(props: SidebarProjec
       openThreadInNewTab,
       openThreadInSplit,
       project.cwd,
-      router,
     ],
   );