refactor(admin): colocate editor content tools

apps/admin/src/common/wangeditor-customer/core/selection.js

+const parseFontSize = value => {
+  const size = Number.parseInt(value, 10)
+  return Number.isFinite(size) ? size : 18
+}
+
+export const getSelectionFontSize = editor => {
+  const path = editor?.selection?.anchor?.path
+  if (!path) return 18
+
+  const node = path.slice(0, 2).reduce(
+    (value, index) => value?.children?.[index],
+    { children: editor.children },
+  )
+  if (!node) return 18
+  if (node.fontSize) return parseFontSize(node.fontSize)
+  if (!editor.toDOMNode) return 18
+
+  const element = editor.toDOMNode(node)
+  const text = element?.querySelector("[data-slate-string='true']")
+  return parseFontSize(window.getComputedStyle(text || element).fontSize)
+}

apps/admin/src/common/wangeditor-customer/features/content-tools/feature.js

 import { defineEditorFeature } from '../../core/define-editor-feature'
-import convertTooltipMenu from '../../customer/ConvertTooltipType'
-import removeSpacesMenu from '../../customer/RemoveSpaces'
+import convertTooltipMenu from './convert-tooltip-type-menu'
+import removeSpacesMenu from './remove-spaces-menu'
 
 export default defineEditorFeature({
   id: 'content-tools',

apps/admin/src/test/wangeditor-customer/selection.test.ts

+import { describe, expect, it } from 'vitest'
+
+import { getSelectionFontSize } from '@/common/wangeditor-customer/core/selection'
+
+describe('getSelectionFontSize', () => {
+  it('uses the default size without a selection', () => {
+    expect(getSelectionFontSize({ selection: null })).toBe(18)
+  })
+
+  it('reads the selected Slate node synchronously', () => {
+    const editor = {
+      selection: { anchor: { path: [0, 0] } },
+      children: [{ children: [{ text: '正文', fontSize: '21px' }] }],
+    }
+
+    expect(getSelectionFontSize(editor)).toBe(21)
+  })
+})