feat(frontend): introduce ESLint no-multiple-empty-lines rule

frontend/.eslintrc.js

@@ -70,6 +70,7 @@ module.exports = {
       ],
       2,
     ],
+    "no-multiple-empty-lines": ["error", { max: 1 }],
   },
   settings: {
     react: {

frontend/src/app-components/attachment/AttachmentInput.tsx

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import { Box, FormHelperText, FormLabel } from "@mui/material";
 import { forwardRef } from "react";
 

frontend/src/app-components/attachment/AttachmentUploader.tsx

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import CloudUploadIcon from "@mui/icons-material/CloudUpload";
 import FolderCopyIcon from "@mui/icons-material/FolderCopy";
 import { Box, Button, Divider, Grid, styled, Typography } from "@mui/material";

frontend/src/app-components/attachment/MultipleAttachmentInput.tsx

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import { Box, Button, FormHelperText, FormLabel } from "@mui/material";
 import { forwardRef, useState } from "react";
 

frontend/src/app-components/inputs/AvatarInput.tsx

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import { Avatar, Box, FormHelperText, FormLabel } from "@mui/material";
 import { forwardRef, useState } from "react";
 

frontend/src/app-components/inputs/FileInput.tsx

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import UploadIcon from "@mui/icons-material/Upload";
 import { Button, CircularProgress } from "@mui/material";
 import { ChangeEvent, forwardRef } from "react";

frontend/src/app-components/tables/columns/renderPicture.tsx

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import { Grid } from "@mui/material";
 import { GridRenderCellParams } from "@mui/x-data-grid";
 

frontend/src/components/content-types/components/FieldInput.tsx

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import DeleteOutlineIcon from "@mui/icons-material/DeleteOutline";
 import { MenuItem } from "@mui/material";
 import { useEffect } from "react";

frontend/src/components/contents/ContentImportDialog.tsx

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import CloseIcon from "@mui/icons-material/Close";
 import { Button, Dialog, DialogActions, DialogContent } from "@mui/material";
 import { FC, useState } from "react";

frontend/src/components/inbox/components/Carousel.tsx

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import ArrowBackIosNewIcon from "@mui/icons-material/ArrowBackIosNew";
 import ArrowForwardIosIcon from "@mui/icons-material/ArrowForwardIos";
 import {

frontend/src/components/inbox/components/ConversationsList.tsx

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import {
   Avatar,
   Conversation,

frontend/src/components/labels/index.tsx

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import { faTags } from "@fortawesome/free-solid-svg-icons";
 import AddIcon from "@mui/icons-material/Add";
 import { Button, Grid, Paper } from "@mui/material";

frontend/src/components/media-library/index.tsx

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import DriveFolderUploadIcon from "@mui/icons-material/DriveFolderUpload";
 import { Box, Grid, Paper } from "@mui/material";
 import { GridColDef, GridEventListener } from "@mui/x-data-grid";

frontend/src/components/nlp/components/NlpEntity.tsx

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import AddIcon from "@mui/icons-material/Add";
 import DeleteIcon from "@mui/icons-material/Delete";
 import { Button, Chip, Grid } from "@mui/material";

frontend/src/components/nlp/components/NlpSample.tsx

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import CircleIcon from "@mui/icons-material/Circle";
 import ClearIcon from "@mui/icons-material/Clear";
 import DeleteIcon from "@mui/icons-material/Delete";

frontend/src/components/nlp/index.tsx

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import { faGraduationCap } from "@fortawesome/free-solid-svg-icons";
 import { Grid, Paper, Tab, Tabs } from "@mui/material";
 import dynamic from "next/dynamic";

frontend/src/components/profile/profile.tsx

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import CheckIcon from "@mui/icons-material/Check";
 import EmailIcon from "@mui/icons-material/Email";
 import KeyIcon from "@mui/icons-material/Key";

frontend/src/components/settings/SettingInput.tsx

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import KeyIcon from "@mui/icons-material/Key";
 import { FormControlLabel, MenuItem, Switch } from "@mui/material";
 import { ControllerRenderProps } from "react-hook-form";

frontend/src/components/visual-editor/constants.ts

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import { IBlockAttributes } from "@/types/block.types";
 import {
   ButtonType,

frontend/src/components/visual-editor/form/AttachmentMessageForm.tsx

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import { Controller, useFormContext } from "react-hook-form";
 
 import AttachmentInput from "@/app-components/attachment/AttachmentInput";

frontend/src/components/visual-editor/form/inputs/triggers/PatternInput.tsx

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2024 Hexastack. All rights reserved.
+ * Copyright © 2025 Hexastack. All rights reserved.
  *
  * Licensed under the GNU Affero General Public License v3.0 (AGPLv3) with the following additional terms:
  * 1. The name "Hexabot" is a trademark of Hexastack. You may not use this name in derivative works without express written permission.
@@ -25,7 +25,6 @@ import {
 
 import { PostbackInput } from "./PostbackInput";
 
-
 const isRegex = (str: Pattern) => {
   return typeof str === "string" && str.startsWith("/") && str.endsWith("/");
 };

frontend/src/components/visual-editor/v2/AdvancedLink/AdvancedLinkFactory.tsx

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import { css, keyframes } from "@emotion/react";
 import styled from "@emotion/styled";
 import {

frontend/src/components/visual-editor/v2/CustomCanvasWidget.tsx

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import styled from "@emotion/styled";
 import {
   CanvasEngine,

frontend/src/components/visual-editor/v2/CustomDiagramNodes/NodeWidget.tsx

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import BrokenImageOutlinedIcon from "@mui/icons-material/BrokenImageOutlined";
 import ChatBubbleOutlineOutlinedIcon from "@mui/icons-material/ChatBubbleOutlineOutlined";
 import ExtensionOutlinedIcon from "@mui/icons-material/ExtensionOutlined";

frontend/src/hooks/useHasPermission.ts

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import { useCallback, useContext } from "react";
 
 import { PermissionContext } from "@/contexts/permission.context";

frontend/src/services/api.class.ts

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import { AxiosInstance, AxiosResponse } from "axios";
 
 import { AttachmentResourceRef } from "@/types/attachment.types";

frontend/src/services/entities.ts

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import { schema } from "normalizr";
 
 import { IBaseSchema } from "@/types/base.types";
@@ -305,7 +304,6 @@ export const LlmHelperEntity = new schema.Entity(
   },
 );
 
-
 export const StorageHelperEntity = new schema.Entity(
   EntityType.STORAGE_HELPER,
   undefined,

frontend/src/services/types.ts

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import { UseMutationOptions } from "react-query";
 
 export enum EntityType {

frontend/src/types/attachment.types.ts

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import { EntityType, Format } from "@/services/types";
 
 import { IBaseSchema, IFormat, OmitPopulate } from "./base.types";

frontend/src/types/base.types.ts

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import { GridPaginationModel, GridSortModel } from "@mui/x-data-grid";
 
 import { EntityType, Format } from "@/services/types";

frontend/src/types/block.types.ts

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import { EntityType, Format } from "@/services/types";
 
 import { IBaseSchema, IFormat, OmitPopulate } from "./base.types";

frontend/src/types/model.types.ts

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import { EntityType, Format } from "@/services/types";
 
 import { IBaseSchema, IFormat, OmitPopulate } from "./base.types";

frontend/src/types/user.types.ts

@@ -6,7 +6,6 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-
 import { EntityType, Format } from "@/services/types";
 
 import { IAttachment } from "./attachment.types";