feat(publish): unify image fetch failure message across adapters

Consolidate per-platform cover/image fetch failure prompts into a single
PUBLISH_IMAGE_FETCH_FAILED_MESSAGE constant shared by baijiahao, bilibili,
dongchedi, qiehao, smzdm, and zol adapters, and generalize the normalizer
to match any *_image_fetch_failed / *_cover_fetch_failed code. Also split
desktop publish list loading into initial vs manual-refresh states so the
refresh button no longer blanks the table, and fix admin-web active-task
detection to cover all pending statuses.

apps/desktop-client/src/main/adapters/smzdm.ts

@@ -4,6 +4,7 @@ import { createCipheriv, createHash } from 'node:crypto'
 import type { JsonValue } from '@geo/shared-types'
 import { nativeImage } from 'electron'
 
+import { PUBLISH_IMAGE_FETCH_FAILED_MESSAGE } from '../../shared/publisher-errors'
 import { resolveDesktopApiURL } from '../transport/api-client'
 import type { PublishAdapter, PublishAdapterContext } from './base'
 import {
@@ -776,7 +777,7 @@ function failureResult(
   if (message.startsWith('smzdm_cover_fetch_failed')) {
     return {
       status: 'failed',
-      summary: '什么值得买封面文件读取失败，请重新上传封面图后重试。',
+      summary: PUBLISH_IMAGE_FETCH_FAILED_MESSAGE,
       error: {
         code: 'smzdm_cover_fetch_failed',
         message,
@@ -787,7 +788,7 @@ function failureResult(
   if (message.startsWith('smzdm_image_fetch_failed')) {
     return {
       status: 'failed',
-      summary: '图片获取错误，请检查你文章和封面图片是否正确',
+      summary: PUBLISH_IMAGE_FETCH_FAILED_MESSAGE,
       error: {
         code: 'smzdm_image_fetch_failed',
         message,