diff --git a/web/src/components/MemoActionMenu/hooks.ts b/web/src/components/MemoActionMenu/hooks.ts
index 53c5c80e8..b0fecaabb 100644
--- a/web/src/components/MemoActionMenu/hooks.ts
+++ b/web/src/components/MemoActionMenu/hooks.ts
@@ -4,7 +4,7 @@ import { useCallback } from "react";
 import toast from "react-hot-toast";
 import { useLocation } from "react-router-dom";
 import { useInstance } from "@/contexts/InstanceContext";
-import { memoKeys, useDeleteMemo, useUpdateMemo } from "@/hooks/useMemoQueries";
+import { useDeleteMemo, useUpdateMemo } from "@/hooks/useMemoQueries";
 import useNavigateTo from "@/hooks/useNavigateTo";
 import { userKeys } from "@/hooks/useUserQueries";
 import { State } from "@/types/proto/api/v1/common_pb";
diff --git a/web/src/components/MemoDetailSidebar/MemoDetailSidebar.tsx b/web/src/components/MemoDetailSidebar/MemoDetailSidebar.tsx
index 3c13361a2..f236d0e84 100644
--- a/web/src/components/MemoDetailSidebar/MemoDetailSidebar.tsx
+++ b/web/src/components/MemoDetailSidebar/MemoDetailSidebar.tsx
@@ -3,7 +3,7 @@ import { timestampDate } from "@bufbuild/protobuf/wkt";
 import { isEqual } from "lodash-es";
 import { CheckCircleIcon, Code2Icon, HashIcon, LinkIcon } from "lucide-react";
 import { cn } from "@/lib/utils";
-import { Memo, Memo_Property, Memo_PropertySchema, MemoRelation_Type } from "@/types/proto/api/v1/memo_service_pb";
+import { Memo, Memo_PropertySchema, MemoRelation_Type } from "@/types/proto/api/v1/memo_service_pb";
 import { useTranslate } from "@/utils/i18n";
 import MemoRelationForceGraph from "../MemoRelationForceGraph";
 
diff --git a/web/src/components/MemoEditor/components/LocationDialog.tsx b/web/src/components/MemoEditor/components/LocationDialog.tsx
index 33e49f757..da5a088bd 100644
--- a/web/src/components/MemoEditor/components/LocationDialog.tsx
+++ b/web/src/components/MemoEditor/components/LocationDialog.tsx
@@ -25,7 +25,7 @@ export const LocationDialog = ({
   open,
   onOpenChange,
   state,
-  locationInitialized,
+  locationInitialized: _locationInitialized,
   onPositionChange,
   onUpdateCoordinate,
   onPlaceholderChange,
diff --git a/web/src/components/MemoEditor/hooks/useKeyboard.ts b/web/src/components/MemoEditor/hooks/useKeyboard.ts
index 5eacbad2a..1cd22ada3 100644
--- a/web/src/components/MemoEditor/hooks/useKeyboard.ts
+++ b/web/src/components/MemoEditor/hooks/useKeyboard.ts
@@ -7,7 +7,7 @@ interface UseKeyboardOptions {
   onToggleFocusMode?: () => void;
 }
 
-export const useKeyboard = (editorRef: React.RefObject<EditorRefActions | null>, options: UseKeyboardOptions) => {
+export const useKeyboard = (_editorRef: React.RefObject<EditorRefActions | null>, options: UseKeyboardOptions) => {
   useEffect(() => {
     const handleKeyDown = (event: KeyboardEvent) => {
       // Cmd/Ctrl + Enter to save
diff --git a/web/src/components/MemoEditor/hooks/useLinkMemo.ts b/web/src/components/MemoEditor/hooks/useLinkMemo.ts
index 60f881787..fd1524136 100644
--- a/web/src/components/MemoEditor/hooks/useLinkMemo.ts
+++ b/web/src/components/MemoEditor/hooks/useLinkMemo.ts
@@ -5,14 +5,7 @@ import { memoServiceClient } from "@/connect";
 import { DEFAULT_LIST_MEMOS_PAGE_SIZE } from "@/helpers/consts";
 import { extractUserIdFromName } from "@/helpers/resource-names";
 import useCurrentUser from "@/hooks/useCurrentUser";
-import {
-  Memo,
-  MemoRelation,
-  MemoRelation_Memo,
-  MemoRelation_MemoSchema,
-  MemoRelation_Type,
-  MemoRelationSchema,
-} from "@/types/proto/api/v1/memo_service_pb";
+import { Memo, MemoRelation, MemoRelation_MemoSchema, MemoRelation_Type, MemoRelationSchema } from "@/types/proto/api/v1/memo_service_pb";
 
 interface UseLinkMemoParams {
   isOpen: boolean;
diff --git a/web/src/components/MemoEditor/state/actions.ts b/web/src/components/MemoEditor/state/actions.ts
index fc405d54c..89296f7da 100644
--- a/web/src/components/MemoEditor/state/actions.ts
+++ b/web/src/components/MemoEditor/state/actions.ts
@@ -1,6 +1,6 @@
 import type { LocalFile } from "@/components/memo-metadata";
 import type { Attachment } from "@/types/proto/api/v1/attachment_service_pb";
-import type { Location, MemoRelation } from "@/types/proto/api/v1/memo_service_pb";
+import type { MemoRelation } from "@/types/proto/api/v1/memo_service_pb";
 import type { EditorAction, EditorState, LoadingKey } from "./types";
 
 export const editorActions = {
diff --git a/web/src/components/Settings/MemberSection.tsx b/web/src/components/Settings/MemberSection.tsx
index ced068cf8..b339b1f49 100644
--- a/web/src/components/Settings/MemberSection.tsx
+++ b/web/src/components/Settings/MemberSection.tsx
@@ -2,7 +2,7 @@ import { create } from "@bufbuild/protobuf";
 import { FieldMaskSchema } from "@bufbuild/protobuf/wkt";
 import { sortBy } from "lodash-es";
 import { MoreVerticalIcon, PlusIcon } from "lucide-react";
-import React, { useState } from "react";
+import { useState } from "react";
 import toast from "react-hot-toast";
 import ConfirmDialog from "@/components/ConfirmDialog";
 import { Button } from "@/components/ui/button";
diff --git a/web/src/components/UpdateAccountDialog.tsx b/web/src/components/UpdateAccountDialog.tsx
index 3faf9ea30..c75026528 100644
--- a/web/src/components/UpdateAccountDialog.tsx
+++ b/web/src/components/UpdateAccountDialog.tsx
@@ -1,4 +1,3 @@
-import { create } from "@bufbuild/protobuf";
 import { isEqual } from "lodash-es";
 import { XIcon } from "lucide-react";
 import { useState } from "react";
@@ -12,7 +11,6 @@ import { useInstance } from "@/contexts/InstanceContext";
 import { convertFileToBase64 } from "@/helpers/utils";
 import useCurrentUser from "@/hooks/useCurrentUser";
 import { useUpdateUser } from "@/hooks/useUserQueries";
-import { User as UserPb, UserSchema } from "@/types/proto/api/v1/user_service_pb";
 import { useTranslate } from "@/utils/i18n";
 import UserAvatar from "./UserAvatar";
 
diff --git a/web/src/components/UserMenu.tsx b/web/src/components/UserMenu.tsx
index 43639901b..3bb9b56f3 100644
--- a/web/src/components/UserMenu.tsx
+++ b/web/src/components/UserMenu.tsx
@@ -89,8 +89,8 @@ const UserMenu = (props: Props) => {
 
     try {
       // Then clear user-specific localStorage items
-      // Preserve app-wide settings like theme
-      const keysToPreserve = ["memos-theme", "tag-view-as-tree", "tag-tree-auto-expand", "viewStore"];
+      // Preserve app-wide settings (theme, locale, view preferences, tag view settings)
+      const keysToPreserve = ["memos-theme", "memos-locale", "memos-view-setting", "tag-view-as-tree", "tag-tree-auto-expand"];
       const keysToRemove: string[] = [];
 
       for (let i = 0; i < localStorage.length; i++) {
@@ -105,8 +105,8 @@ const UserMenu = (props: Props) => {
       // Ignore errors from localStorage operations
     }
 
-    // Always redirect to auth page
-    window.location.href = Routes.AUTH;
+    // Always redirect to auth page (use replace to prevent back navigation)
+    window.location.replace(Routes.AUTH);
   };
 
   return (
diff --git a/web/src/connect.ts b/web/src/connect.ts
index 125385cfc..1a8cb7177 100644
--- a/web/src/connect.ts
+++ b/web/src/connect.ts
@@ -2,8 +2,6 @@ import { timestampDate } from "@bufbuild/protobuf/wkt";
 import { Code, ConnectError, createClient, type Interceptor } from "@connectrpc/connect";
 import { createConnectTransport } from "@connectrpc/connect-web";
 import { getAccessToken, setAccessToken } from "./auth-state";
-import { getInstanceConfig } from "./instance-config";
-import { ROUTES } from "./router/routes";
 import { ActivityService } from "./types/proto/api/v1/activity_service_pb";
 import { AttachmentService } from "./types/proto/api/v1/attachment_service_pb";
 import { AuthService } from "./types/proto/api/v1/auth_service_pb";
@@ -12,6 +10,7 @@ import { InstanceService } from "./types/proto/api/v1/instance_service_pb";
 import { MemoService } from "./types/proto/api/v1/memo_service_pb";
 import { ShortcutService } from "./types/proto/api/v1/shortcut_service_pb";
 import { UserService } from "./types/proto/api/v1/user_service_pb";
+import { redirectOnAuthFailure } from "./utils/auth-redirect";
 
 // ============================================================================
 // Constants
@@ -20,19 +19,6 @@ import { UserService } from "./types/proto/api/v1/user_service_pb";
 const RETRY_HEADER = "X-Retry";
 const RETRY_HEADER_VALUE = "true";
 
-const ROUTE_CONFIG = {
-  // Routes accessible without authentication (uses prefix matching)
-  public: [
-    ROUTES.AUTH, // Authentication pages
-    ROUTES.EXPLORE, // Explore page
-    "/u/", // User profile pages (dynamic)
-    "/memos/", // Individual memo detail pages (dynamic)
-  ],
-
-  // Routes that require authentication (uses exact matching)
-  private: [ROUTES.ROOT, ROUTES.ATTACHMENTS, ROUTES.INBOX, ROUTES.ARCHIVED, ROUTES.SETTING],
-} as const;
-
 // ============================================================================
 // Token Refresh State Management
 // ============================================================================
@@ -60,42 +46,6 @@ const createTokenRefreshManager = () => {
 
 const tokenRefreshManager = createTokenRefreshManager();
 
-// ============================================================================
-// Route Access Control
-// ============================================================================
-
-function isPublicRoute(path: string): boolean {
-  return ROUTE_CONFIG.public.some((route) => path.startsWith(route));
-}
-
-function isPrivateRoute(path: string): boolean {
-  return (ROUTE_CONFIG.private as readonly string[]).includes(path);
-}
-
-function getAuthFailureRedirect(currentPath: string): string | null {
-  if (isPublicRoute(currentPath)) {
-    return null;
-  }
-
-  if (getInstanceConfig().memoRelatedSetting.disallowPublicVisibility) {
-    return ROUTES.AUTH;
-  }
-
-  if (isPrivateRoute(currentPath)) {
-    return ROUTES.EXPLORE;
-  }
-
-  return null;
-}
-
-function performRedirect(redirectUrl: string | null): void {
-  if (redirectUrl) {
-    // Use replace() instead of href to prevent back button from showing cached sensitive data
-    // This removes the current page from browser history after authentication failure
-    window.location.replace(redirectUrl);
-  }
-}
-
 // ============================================================================
 // Token Refresh
 // ============================================================================
@@ -165,8 +115,7 @@ const authInterceptor: Interceptor = (next) => async (req) => {
       req.header.set(RETRY_HEADER, RETRY_HEADER_VALUE);
       return await next(req);
     } catch (refreshError) {
-      const redirectUrl = getAuthFailureRedirect(window.location.pathname);
-      performRedirect(redirectUrl);
+      redirectOnAuthFailure();
       throw refreshError;
     }
   }
diff --git a/web/src/hooks/useMediaQuery.ts b/web/src/hooks/useMediaQuery.ts
index af8df11a1..ed5e1986b 100644
--- a/web/src/hooks/useMediaQuery.ts
+++ b/web/src/hooks/useMediaQuery.ts
@@ -32,4 +32,3 @@ const useMediaQuery = (breakpoint: Breakpoint): boolean => {
 };
 
 export default useMediaQuery;
-
diff --git a/web/src/layouts/RootLayout.tsx b/web/src/layouts/RootLayout.tsx
index 6568172e7..cf2454a83 100644
--- a/web/src/layouts/RootLayout.tsx
+++ b/web/src/layouts/RootLayout.tsx
@@ -1,4 +1,4 @@
-import { Suspense, useEffect, useMemo, useState } from "react";
+import { Suspense, useEffect, useMemo } from "react";
 import { Outlet, useLocation, useSearchParams } from "react-router-dom";
 import usePrevious from "react-use/lib/usePrevious";
 import Navigation from "@/components/Navigation";
@@ -8,7 +8,7 @@ import useCurrentUser from "@/hooks/useCurrentUser";
 import useMediaQuery from "@/hooks/useMediaQuery";
 import { cn } from "@/lib/utils";
 import Loading from "@/pages/Loading";
-import { Routes } from "@/router";
+import { redirectOnAuthFailure } from "@/utils/auth-redirect";
 
 const RootLayout = () => {
   const location = useLocation();
@@ -17,25 +17,14 @@ const RootLayout = () => {
   const currentUser = useCurrentUser();
   const { memoRelatedSetting } = useInstance();
   const { removeFilter } = useMemoFilterContext();
-  const [initialized, setInitialized] = useState(false);
   const pathname = useMemo(() => location.pathname, [location.pathname]);
   const prevPathname = usePrevious(pathname);
 
   useEffect(() => {
-    if (!currentUser) {
-      // If disallowPublicVisibility is enabled, redirect to login
-      if (memoRelatedSetting.disallowPublicVisibility) {
-        window.location.replace(Routes.AUTH);
-        return;
-      } else if (
-        ([Routes.ROOT, Routes.ATTACHMENTS, Routes.INBOX, Routes.ARCHIVED, Routes.SETTING] as string[]).includes(location.pathname)
-      ) {
-        window.location.replace(Routes.EXPLORE);
-        return;
-      }
+    if (!currentUser && memoRelatedSetting.disallowPublicVisibility) {
+      redirectOnAuthFailure();
     }
-    setInitialized(true);
-  }, [currentUser, memoRelatedSetting.disallowPublicVisibility, location.pathname]);
+  }, [currentUser, memoRelatedSetting.disallowPublicVisibility]);
 
   useEffect(() => {
     // When the route changes and there is no filter in the search params, remove all filters
@@ -44,9 +33,7 @@ const RootLayout = () => {
     }
   }, [prevPathname, pathname, searchParams, removeFilter]);
 
-  return !initialized ? (
-    <Loading />
-  ) : (
+  return (
     <div className="w-full min-h-full flex flex-row justify-center items-start sm:pl-16">
       {sm && (
         <div
diff --git a/web/src/pages/MemoDetail.tsx b/web/src/pages/MemoDetail.tsx
index 37e0cc4ef..3dabcf59e 100644
--- a/web/src/pages/MemoDetail.tsx
+++ b/web/src/pages/MemoDetail.tsx
@@ -57,7 +57,7 @@ const MemoDetail = () => {
     setShowCommentEditor(true);
   };
 
-  const handleCommentCreated = async (memoCommentName: string) => {
+  const handleCommentCreated = async (_memoCommentName: string) => {
     // React Query will auto-refetch due to invalidation in the mutation
     setShowCommentEditor(false);
   };
diff --git a/web/src/utils/auth-redirect.ts b/web/src/utils/auth-redirect.ts
new file mode 100644
index 000000000..a352576f2
--- /dev/null
+++ b/web/src/utils/auth-redirect.ts
@@ -0,0 +1,36 @@
+import { getInstanceConfig } from "@/instance-config";
+import { ROUTES } from "@/router/routes";
+
+const PUBLIC_ROUTES = [
+  ROUTES.AUTH, // Authentication pages
+  ROUTES.EXPLORE, // Explore page
+  "/u/", // User profile pages (dynamic)
+  "/memos/", // Individual memo detail pages (dynamic)
+] as const;
+
+const PRIVATE_ROUTES = [ROUTES.ROOT, ROUTES.ATTACHMENTS, ROUTES.INBOX, ROUTES.ARCHIVED, ROUTES.SETTING] as const;
+
+function isPublicRoute(path: string): boolean {
+  return PUBLIC_ROUTES.some((route) => path.startsWith(route));
+}
+
+function isPrivateRoute(path: string): boolean {
+  return PRIVATE_ROUTES.includes(path as any);
+}
+
+export function redirectOnAuthFailure(): void {
+  const currentPath = window.location.pathname;
+
+  // Don't redirect if it's a public route
+  if (isPublicRoute(currentPath)) {
+    return;
+  }
+
+  const disallowPublicVisibility = getInstanceConfig().memoRelatedSetting.disallowPublicVisibility;
+  const target = disallowPublicVisibility ? ROUTES.AUTH : ROUTES.EXPLORE;
+
+  // Only redirect if it's a private route or disallowPublicVisibility is enabled
+  if (disallowPublicVisibility || isPrivateRoute(currentPath)) {
+    window.location.replace(target);
+  }
+}
diff --git a/web/tsconfig.json b/web/tsconfig.json
index 56a269f53..44b35c12d 100644
--- a/web/tsconfig.json
+++ b/web/tsconfig.json
@@ -8,6 +8,8 @@
     "esModuleInterop": false,
     "allowSyntheticDefaultImports": true,
     "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
     "forceConsistentCasingInFileNames": true,
     "module": "ESNext",
     "moduleResolution": "Node",