Fix file tree not visible when opening a project with no active thread (#115)

* Initial plan

* fix: show file tree when project is expanded without an active thread

Agent-Logs-Url: https://github.com/OpenKnots/okcode/sessions/96f8a0de-9710-4cb1-9674-1d481e293d8b

Co-authored-by: BunsDev <68980965+BunsDev@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: BunsDev <68980965+BunsDev@users.noreply.github.com>

Author: Copilot

apps/web/src/components/Sidebar.tsx

@@ -1480,7 +1480,7 @@ export default function Sidebar() {
             )}
           </SidebarMenuSub>
 
-          {project.expanded && activeProjectThread && !appSettings.sidebarHideFiles ? (
+          {project.expanded && !appSettings.sidebarHideFiles ? (
             <div className="mx-1.5 mt-1 rounded-lg border border-border/40 bg-background/50 p-2 dark:border-border/30 dark:bg-background/30">
               <button
                 type="button"