[optimize] simplify AI codes

Co-authored-by: Copilot <copilot@github.com>

Author: TechQuery

components/Activity/Hackathon/constant.ts

@@ -1,3 +1,4 @@
+import { TableCellUser } from 'mobx-lark';
 import { Activity, ActivityModel } from '../../../models/Activity';
 import { Agenda, Organization, Person, Prize, Project, Template } from '../../../models/Hackathon';
 import { i18n } from '../../../models/Translation';
@@ -11,7 +12,6 @@ import {
   formatPeriod,
   normalizeAgendaType,
   previewText,
-  userOf,
 } from './utility';
 
 export const RequiredTableKeys = [
@@ -335,7 +335,6 @@ export const buildProjectItems = (
   { projects, activity }: { projects: Project[]; activity: Activity },
 ) =>
   projects.map(({ id, name, score, summary, createdBy, members }) => {
-    const creator = userOf(createdBy);
     const scoreText = score === null || score === undefined || score === '' ? '—' : `${score}`;
 
     return {
@@ -345,10 +344,10 @@ export const buildProjectItems = (
       score: scoreText,
       description: (summary as string) || '',
       meta: [
-        creator
+        createdBy
           ? {
               label: t('created_by'),
-              value: creator.name || '—',
+              value: (createdBy as TableCellUser)?.name || '—',
             }
           : { label: t('created_by'), value: '—' },
         {

components/Activity/Hackathon/utility.ts

@@ -1,5 +1,5 @@
-import { TableCellUser, TableCellValue, TableFormView } from 'mobx-lark';
-import { formatDate } from 'web-utility';
+import { TableCellValue, TableFormView } from 'mobx-lark';
+import { Day, formatDate } from 'web-utility';
 
 import type { HackathonScheduleTone } from './Schedule';
 import { i18n, I18nKey } from '../../../models/Translation';
@@ -94,16 +94,6 @@ const textOf = (value: TextLike) => {
 export const firstTextOf = (value: TextListLike) =>
   (Array.isArray(value) ? value.map(textOf).find(Boolean) : textOf(value)) || '';
 
-export const textListOf = (value: TextListLike) =>
-  (Array.isArray(value) ? value : [value]).map(textOf).filter(Boolean);
-
-export const relationNameOf = (value: TextListLike) => firstTextOf(value);
-
-export const userOf = (value?: TableCellValue | TableCellUser) =>
-  value && typeof value === 'object' && !Array.isArray(value) && 'name' in value
-    ? (value as TableCellUser)
-    : undefined;
-
 export const formatMoment = (value?: TableCellValue) => (value ? formatDate(value as string) : '');
 
 export const formatPeriod = (startedAt?: TableCellValue, endedAt?: TableCellValue) =>
@@ -152,7 +142,8 @@ export const resolveCountdownState = <T extends CountdownWindow>(
       ? nextItem?.startedAt
       : nextItem?.endedAt;
   const fallbackCountdownTarget = timeOf(startTime) > referenceTime ? startTime : endTime;
-  const countdownTo = countdownTextOf(nextCountdownTarget) || countdownTextOf(fallbackCountdownTarget);
+  const countdownTo =
+    countdownTextOf(nextCountdownTarget) || countdownTextOf(fallbackCountdownTarget);
 
   return { nextItem, countdownTo };
 };
@@ -219,7 +210,7 @@ export const daysBetween = (startedAt?: TableCellValue, endedAt?: TableCellValue
 
   if (!Number.isFinite(start) || !Number.isFinite(end) || end < start) return 0;
 
-  return Math.max(1, Math.ceil((end - start) / (24 * 60 * 60 * 1000)));
+  return Math.max(1, Math.ceil((end - start) / Day));
 };
 
 export const normalizeAgendaType = (value?: TableCellValue) =>