refactor: enhance chat tab management by implementing fallback navigation and preventing race conditions during deletion for improved user experience

surfsense_web/app/dashboard/[search_space_id]/new-chat/[[...chat_id]]/page.tsx

@@ -33,7 +33,7 @@ import { closeReportPanelAtom } from "@/atoms/chat/report-panel.atom";
 import { type AgentCreatedDocument, agentCreatedDocumentsAtom } from "@/atoms/documents/ui.atoms";
 import { closeEditorPanelAtom } from "@/atoms/editor/editor-panel.atom";
 import { membersAtom } from "@/atoms/members/members-query.atoms";
-import { updateChatTabTitleAtom } from "@/atoms/tabs/tabs.atom";
+import { removeChatTabAtom, updateChatTabTitleAtom } from "@/atoms/tabs/tabs.atom";
 import { currentUserAtom } from "@/atoms/user/user-query.atoms";
 import { ThinkingStepsDataUI } from "@/components/assistant-ui/thinking-steps";
 import { Thread } from "@/components/assistant-ui/thread";
@@ -70,6 +70,7 @@ import {
 	getThreadMessages,
 	type ThreadRecord,
 } from "@/lib/chat/thread-persistence";
+import { NotFoundError } from "@/lib/error";
 import {
 	trackChatCreated,
 	trackChatError,
@@ -194,6 +195,7 @@ export default function NewChatPage() {
 	const closeReportPanel = useSetAtom(closeReportPanelAtom);
 	const closeEditorPanel = useSetAtom(closeEditorPanelAtom);
 	const updateChatTabTitle = useSetAtom(updateChatTabTitleAtom);
+	const removeChatTab = useSetAtom(removeChatTabAtom);
 	const setAgentCreatedDocuments = useSetAtom(agentCreatedDocumentsAtom);
 
 	// Get current user for author info in shared chats
@@ -323,6 +325,14 @@ export default function NewChatPage() {
 			// This improves UX (instant load) and avoids orphan threads
 		} catch (error) {
 			console.error("[NewChatPage] Failed to initialize thread:", error);
+			if (urlChatId > 0 && error instanceof NotFoundError) {
+				removeChatTab(urlChatId);
+				if (typeof window !== "undefined") {
+					window.history.replaceState(null, "", `/dashboard/${searchSpaceId}/new-chat`);
+				}
+				toast.error("This chat was deleted.");
+				return;
+			}
 			// Keep threadId as null - don't use Date.now() as it creates an invalid ID
 			// that will cause 404 errors on subsequent API calls
 			setThreadId(null);
@@ -338,12 +348,14 @@ export default function NewChatPage() {
 		setSidebarDocuments,
 		closeReportPanel,
 		closeEditorPanel,
+		removeChatTab,
+		searchSpaceId,
 	]);
 
 	// Initialize on mount, and re-init when switching search spaces (even if urlChatId is the same)
 	useEffect(() => {
 		initializeThread();
-	}, [initializeThread, searchSpaceId]);
+	}, [initializeThread]);
 
 	// Prefetch document titles for @ mention picker
 	// Runs when user lands on page so data is ready when they type @

surfsense_web/atoms/tabs/tabs.atom.ts

@@ -33,6 +33,9 @@ const initialState: TabsState = {
 	activeTabId: "chat-new",
 };
 
+// Prevent race conditions where route-sync recreates a just-deleted chat tab.
+const deletedChatIdsAtom = atom<Set<number>>(new Set<number>());
+
 const sessionStorageAdapter = createJSONStorage<TabsState>(
 	() => (typeof window !== "undefined" ? sessionStorage : undefined) as Storage
 );
@@ -71,6 +74,10 @@ export const syncChatTabAtom = atom(
 		set,
 		{ chatId, title, chatUrl }: { chatId: number | null; title?: string; chatUrl?: string }
 	) => {
+		if (chatId && get(deletedChatIdsAtom).has(chatId)) {
+			return;
+		}
+
 		const state = get(tabsStateAtom);
 		const tabId = makeChatTabId(chatId);
 		const existing = state.tabs.find((t) => t.id === tabId);
@@ -235,6 +242,9 @@ export const removeChatTabAtom = atom(null, (get, set, chatId: number) => {
 	const idx = state.tabs.findIndex((t) => t.id === tabId);
 	if (idx === -1) return null;
 
+	const deletedChatIds = get(deletedChatIdsAtom);
+	set(deletedChatIdsAtom, new Set([...deletedChatIds, chatId]));
+
 	const remaining = state.tabs.filter((t) => t.id !== tabId);
 
 	// Always keep at least one tab available.
@@ -259,4 +269,5 @@ export const removeChatTabAtom = atom(null, (get, set, chatId: number) => {
 /** Reset tabs when switching search spaces. */
 export const resetTabsAtom = atom(null, (_get, set) => {
 	set(tabsStateAtom, { ...initialState });
+	set(deletedChatIdsAtom, new Set<number>());
 });

surfsense_web/components/layout/providers/LayoutDataProvider.tsx

@@ -639,10 +639,13 @@ export function LayoutDataProvider({ searchSpaceId, children }: LayoutDataProvid
 		setIsDeletingChat(true);
 		try {
 			await deleteThread(chatToDelete.id);
-			removeChatTab(chatToDelete.id);
+			const fallbackTab = removeChatTab(chatToDelete.id);
 			queryClient.invalidateQueries({ queryKey: ["threads", searchSpaceId] });
 			if (currentChatId === chatToDelete.id) {
 				resetCurrentThread();
+				if (fallbackTab?.type === "chat" && fallbackTab.chatUrl) {
+					router.push(fallbackTab.chatUrl);
+				} else {
 					const isOutOfSync = currentThreadState.id !== null && !params?.chat_id;
 					if (isOutOfSync) {
 						window.history.replaceState(null, "", `/dashboard/${searchSpaceId}/new-chat`);
@@ -651,6 +654,7 @@ export function LayoutDataProvider({ searchSpaceId, children }: LayoutDataProvid
 						router.push(`/dashboard/${searchSpaceId}/new-chat`);
 					}
 				}
+			}
 		} catch (error) {
 			console.error("Error deleting thread:", error);
 		} finally {

surfsense_web/components/layout/ui/sidebar/AllPrivateChatsSidebar.tsx

@@ -161,7 +161,7 @@ export function AllPrivateChatsSidebarContent({
 			setDeletingThreadId(threadId);
 			try {
 				await deleteThread(threadId);
-				removeChatTab(threadId);
+				const fallbackTab = removeChatTab(threadId);
 				toast.success(t("chat_deleted") || "Chat deleted successfully");
 				queryClient.invalidateQueries({ queryKey: ["all-threads", searchSpaceId] });
 				queryClient.invalidateQueries({ queryKey: ["search-threads", searchSpaceId] });
@@ -170,6 +170,10 @@ export function AllPrivateChatsSidebarContent({
 				if (currentChatId === threadId) {
 					onOpenChange(false);
 					setTimeout(() => {
+						if (fallbackTab?.type === "chat" && fallbackTab.chatUrl) {
+							router.push(fallbackTab.chatUrl);
+							return;
+						}
 						router.push(`/dashboard/${searchSpaceId}/new-chat`);
 					}, 250);
 				}

surfsense_web/components/layout/ui/sidebar/AllSharedChatsSidebar.tsx

@@ -161,7 +161,7 @@ export function AllSharedChatsSidebarContent({
 			setDeletingThreadId(threadId);
 			try {
 				await deleteThread(threadId);
-				removeChatTab(threadId);
+				const fallbackTab = removeChatTab(threadId);
 				toast.success(t("chat_deleted") || "Chat deleted successfully");
 				queryClient.invalidateQueries({ queryKey: ["all-threads", searchSpaceId] });
 				queryClient.invalidateQueries({ queryKey: ["search-threads", searchSpaceId] });
@@ -170,6 +170,10 @@ export function AllSharedChatsSidebarContent({
 				if (currentChatId === threadId) {
 					onOpenChange(false);
 					setTimeout(() => {
+						if (fallbackTab?.type === "chat" && fallbackTab.chatUrl) {
+							router.push(fallbackTab.chatUrl);
+							return;
+						}
 						router.push(`/dashboard/${searchSpaceId}/new-chat`);
 					}, 250);
 				}

surfsense_web/components/layout/ui/sidebar/DocumentsSidebar.tsx

@@ -7,16 +7,15 @@ import { useParams } from "next/navigation";
 import { useTranslations } from "next-intl";
 import { useCallback, useEffect, useMemo, useState } from "react";
 import { toast } from "sonner";
-import { MarkdownViewer } from "@/components/markdown-viewer";
 import { DocumentsFilters } from "@/app/dashboard/[search_space_id]/documents/(manage)/components/DocumentsFilters";
 import { sidebarSelectedDocumentsAtom } from "@/atoms/chat/mentioned-documents.atom";
 import { connectorDialogOpenAtom } from "@/atoms/connector-dialog/connector-dialog.atoms";
 import { connectorsAtom } from "@/atoms/connectors/connector-query.atoms";
 import { deleteDocumentMutationAtom } from "@/atoms/documents/document-mutation.atoms";
+import { openEditorPanelAtom } from "@/atoms/editor/editor-panel.atom";
 import { expandedFolderIdsAtom } from "@/atoms/documents/folder.atoms";
 import { rightPanelCollapsedAtom } from "@/atoms/layout/right-panel.atom";
 import { agentCreatedDocumentsAtom } from "@/atoms/documents/ui.atoms";
-import { openDocumentTabAtom } from "@/atoms/tabs/tabs.atom";
 import { CreateFolderDialog } from "@/components/documents/CreateFolderDialog";
 import type { DocumentNodeDoc } from "@/components/documents/DocumentNode";
 import type { FolderDisplay } from "@/components/documents/FolderNode";
@@ -35,22 +34,13 @@ import {
 } from "@/components/ui/alert-dialog";
 import { Avatar, AvatarFallback, AvatarGroup } from "@/components/ui/avatar";
 import { Button } from "@/components/ui/button";
-import {
-	Drawer,
-	DrawerContent,
-	DrawerHandle,
-	DrawerHeader,
-	DrawerTitle,
-} from "@/components/ui/drawer";
 import { Spinner } from "@/components/ui/spinner";
 import { Tooltip, TooltipContent, TooltipTrigger } from "@/components/ui/tooltip";
 import { getConnectorIcon } from "@/contracts/enums/connectorIcons";
 import type { DocumentTypeEnum } from "@/contracts/types/document.types";
 import { useDebouncedValue } from "@/hooks/use-debounced-value";
 import { useMediaQuery } from "@/hooks/use-media-query";
-import { useIsMobile } from "@/hooks/use-mobile";
 import { foldersApiService } from "@/lib/apis/folders-api.service";
-import { documentsApiService } from "@/lib/apis/documents-api.service";
 import { authenticatedFetch } from "@/lib/auth-utils";
 import { queries } from "@/zero/queries/index";
 import { SidebarSlideOutPanel } from "./SidebarSlideOutPanel";
@@ -95,12 +85,10 @@ export function DocumentsSidebar({
 	const searchSpaceId = Number(params.search_space_id);
 	const setConnectorDialogOpen = useSetAtom(connectorDialogOpenAtom);
 	const setRightPanelCollapsed = useSetAtom(rightPanelCollapsedAtom);
-	const openDocumentTab = useSetAtom(openDocumentTabAtom);
+	const openEditorPanel = useSetAtom(openEditorPanelAtom);
 	const { data: connectors } = useAtomValue(connectorsAtom);
 	const connectorCount = connectors?.length ?? 0;
 
-	const isMobileLayout = useIsMobile();
-
 	const [search, setSearch] = useState("");
 	const debouncedSearch = useDebouncedValue(search, 250);
 	const [activeTypes, setActiveTypes] = useState<DocumentTypeEnum[]>([]);
@@ -374,31 +362,6 @@ export function DocumentsSidebar({
 		[]
 	);
 
-	// Document popup viewer state (for tree view "Open" and mobile preview)
-	const [viewingDoc, setViewingDoc] = useState<DocumentNodeDoc | null>(null);
-	const [viewingContent, setViewingContent] = useState<string>("");
-	const [viewingLoading, setViewingLoading] = useState(false);
-
-	const handleViewDocumentPopup = useCallback(async (doc: DocumentNodeDoc) => {
-		setViewingDoc(doc);
-		setViewingLoading(true);
-		try {
-			const fullDoc = await documentsApiService.getDocument({ id: doc.id });
-			setViewingContent(fullDoc.content);
-		} catch (err) {
-			console.error("[DocumentsSidebar] Failed to fetch document content:", err);
-			setViewingContent("Failed to load document content.");
-		} finally {
-			setViewingLoading(false);
-		}
-	}, []);
-
-	const handleCloseViewer = useCallback(() => {
-		setViewingDoc(null);
-		setViewingContent("");
-		setViewingLoading(false);
-	}, []);
-
 	const handleToggleChatMention = useCallback(
 		(doc: { id: number; title: string; document_type: string }, isMentioned: boolean) => {
 			if (isMentioned) {
@@ -716,24 +679,18 @@ export function DocumentsSidebar({
 					onCreateFolder={handleCreateFolder}
 					searchQuery={debouncedSearch.trim() || undefined}
 					onPreviewDocument={(doc) => {
-						if (isMobileLayout) {
+						openEditorPanel({
-							handleViewDocumentPopup(doc);
-						} else {
-							openDocumentTab({
 							documentId: doc.id,
 							searchSpaceId,
 							title: doc.title,
 						});
-						}
 					}}
 					onEditDocument={(doc) => {
-						if (!isMobileLayout) {
+						openEditorPanel({
-							openDocumentTab({
 							documentId: doc.id,
 							searchSpaceId,
 							title: doc.title,
 						});
-						}
 					}}
 					onDeleteDocument={(doc) => handleDeleteDocument(doc.id)}
 					onMoveDocument={handleMoveDocument}
@@ -761,26 +718,6 @@ export function DocumentsSidebar({
 				onConfirm={handleCreateFolderConfirm}
 			/>
 
-			<Drawer open={!!viewingDoc} onOpenChange={(open) => !open && handleCloseViewer()}>
-				<DrawerContent className="max-h-[85vh] flex flex-col">
-					<DrawerHandle />
-					<DrawerHeader className="text-left shrink-0">
-						<DrawerTitle className="text-base leading-tight break-words">
-							{viewingDoc?.title}
-						</DrawerTitle>
-					</DrawerHeader>
-					<div className="overflow-y-auto flex-1 min-h-0 px-4 pb-6 select-text text-xs [&_h1]:text-base! [&_h1]:mt-3! [&_h2]:text-sm! [&_h2]:mt-2! [&_h3]:text-xs! [&_h3]:mt-2!">
-						{viewingLoading ? (
-							<div className="flex items-center justify-center py-12">
-								<Spinner size="lg" className="text-muted-foreground" />
-							</div>
-						) : (
-							<MarkdownViewer content={viewingContent} />
-						)}
-					</div>
-				</DrawerContent>
-			</Drawer>
-
 			<AlertDialog
 				open={bulkDeleteConfirmOpen}
 				onOpenChange={(open) => !open && !isBulkDeleting && setBulkDeleteConfirmOpen(false)}

surfsense_web/components/layout/ui/tabs/TabBar.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 import { useAtomValue, useSetAtom } from "jotai";
-import { FileText, MessageSquare, Plus, X } from "lucide-react";
+import { Plus, X } from "lucide-react";
 import { useCallback, useEffect, useRef } from "react";
 import {
 	activeTabIdAtom,
@@ -65,7 +65,6 @@ export function TabBar({ onTabSwitch, onNewChat, className }: TabBarProps) {
 			>
 				{tabs.map((tab) => {
 					const isActive = tab.id === activeTabId;
-					const Icon = tab.type === "document" ? FileText : MessageSquare;
 
 					return (
 						<button
@@ -74,15 +73,16 @@ export function TabBar({ onTabSwitch, onNewChat, className }: TabBarProps) {
 							data-tab-id={tab.id}
 							onClick={() => handleTabClick(tab)}
 							className={cn(
-								"group relative flex h-full items-center self-stretch gap-1.5 px-3 min-w-0 max-w-[200px] text-xs font-medium border-r transition-colors shrink-0",
+								"group relative flex h-full w-[170px] items-center self-stretch px-3 min-w-0 overflow-hidden text-sm font-medium border-r transition-colors shrink-0",
 								isActive
 									? "bg-muted/40 text-foreground"
 									: "bg-transparent text-muted-foreground hover:bg-muted/25 hover:text-foreground"
 							)}
 						>
 							{isActive && <span className="absolute bottom-0 left-0 right-0 h-[2px] bg-primary" />}
-							<Icon className="size-3.5 shrink-0" />
+							<span className="block min-w-0 flex-1 truncate text-left transition-[padding-right] duration-150 group-hover:pr-5 group-focus-within:pr-5">
-							<span className="truncate">{tab.title}</span>
+								{tab.title}
+							</span>
 							{/* biome-ignore lint/a11y/useSemanticElements: cannot nest button inside button */}
 							<span
 								role="button"
@@ -95,10 +95,10 @@ export function TabBar({ onTabSwitch, onNewChat, className }: TabBarProps) {
 									}
 								}}
 								className={cn(
-									"ml-auto shrink-0 rounded-sm p-0.5 transition-colors",
+									"absolute right-2 top-1/2 -translate-y-1/2 shrink-0 rounded-sm p-0.5 transition-colors",
 									isActive
-										? "opacity-60 hover:opacity-100 hover:bg-muted"
+										? "opacity-0 group-hover:opacity-70 group-focus-within:opacity-70 hover:opacity-100 hover:bg-muted"
-										: "opacity-0 group-hover:opacity-60 hover:opacity-100! hover:bg-muted"
+										: "opacity-0 group-hover:opacity-60 group-focus-within:opacity-60 hover:opacity-100! hover:bg-muted"
 								)}
 							>
 								<X className="size-3" />