feat(editor): add markdown presets, heading folding and external file refresh

frontend/src/features/settings/SettingsView.vue

@@ -5,6 +5,8 @@ const { actionDialog, resolveAction, askConfirm } = useActionDialog()
 import { computed, onMounted, ref } from 'vue'
 import type { ProviderConfig } from '@/contracts'
 import ProviderForm from './ProviderForm.vue'
+import HeadingStyleSettings from '@/features/editor/HeadingStyleSettings.vue'
+import MarkdownPreferenceSettings from '@/features/editor/MarkdownPreferenceSettings.vue'
 import ChatPersonaDialog from '@/features/chat/ChatPersonaDialog.vue'
 import ProviderLogo from './ProviderLogo.vue'
 import ModelRoutingSettings from './ModelRoutingSettings.vue'
@@ -85,7 +87,7 @@ async function chooseDefaultModel(provider: ProviderConfig, event: Event) {
     <ChatPersonaDialog v-if="showPersona" @close="showPersona = false" />
     <div v-if="activeSection === 'general'" class="panel settings-section"><h2>{{ t('通用', 'General') }}</h2><label class="setting-row"><span><strong>{{ t('恢复上次 Vault', 'Restore last Vault') }}</strong><small>{{ t('启动后自动打开最近使用的知识库', 'Open the most recently used knowledge base at startup') }}</small></span><input v-model="settingsStore.restoreLastVault" type="checkbox" /></label><div class="setting-row"><span><strong>{{ t('自动保存间隔', 'Autosave interval') }}</strong><small>{{ t('编辑停止后等待多久写入文件', 'How long to wait after editing before saving') }}</small></span><select v-model.number="settingsStore.autoSaveInterval" class="select short"><option :value="500">0.5 {{ t('秒', 'sec') }}</option><option :value="1500">1.5 {{ t('秒', 'sec') }}</option><option :value="3000">3 {{ t('秒', 'sec') }}</option></select></div><div class="setting-row"><span><strong>{{ t('界面语言', 'Interface language') }}</strong><small>{{ t('切换后立即应用到界面', 'Applied to the interface immediately') }}</small></span><select v-model="settingsStore.language" class="select short"><option value="zh-CN">简体中文</option><option value="en">English</option></select></div><div class="setting-row"><span><strong>{{ t('版本', 'Version') }}</strong><small>Desktop / AI Core</small></span><span>{{ settingsStore.appVersion }} / {{ settingsStore.aiCoreVersion }}</span></div></div>
 
-    <div v-else-if="activeSection === 'editor'" class="panel settings-section"><h2>{{ t('编辑器', 'Editor') }}</h2><div class="setting-row"><span><strong>{{ t('默认模式', 'Default mode') }}</strong><small>{{ t('新打开文件使用的编辑器模式', 'Editor mode used for newly opened files') }}</small></span><select v-model="settingsStore.defaultEditorMode" class="select short"><option value="wysiwyg">{{ t('写作与预览', 'Writing and preview') }}</option><option value="source">{{ t('Markdown 源码', 'Markdown source') }}</option></select></div><div class="setting-row"><span><strong>{{ t('字号', 'Font size') }}</strong></span><input v-model.number="themeStore.fontEditorSize" class="input short" type="number" min="12" max="32" /></div><div class="setting-row"><span><strong>{{ t('行高', 'Line height') }}</strong></span><input v-model.number="themeStore.lineHeight" class="input short" type="number" min="1.2" max="2.4" step="0.1" /></div><div class="setting-row"><span><strong>{{ t('行宽', 'Line width') }}</strong><small>{{ t('Markdown 预览最大字符宽度', 'Maximum character width for Markdown preview') }}</small></span><input v-model.number="settingsStore.editorLineWidth" class="input short" type="number" min="40" max="140" /></div><label class="setting-row"><span><strong>{{ t('拼写检查', 'Spell check') }}</strong><small>{{ t('在写作与源码编辑器中使用系统拼写检查', 'Use system spell checking in visual and source editors') }}</small></span><input v-model="settingsStore.spellCheck" type="checkbox" /></label></div>
+    <div v-else-if="activeSection === 'editor'" class="panel settings-section"><h2>{{ t('编辑器', 'Editor') }}</h2><div class="setting-row"><span><strong>{{ t('默认模式', 'Default mode') }}</strong><small>{{ t('新打开文件使用的编辑器模式', 'Editor mode used for newly opened files') }}</small></span><select v-model="settingsStore.defaultEditorMode" class="select short"><option value="wysiwyg">{{ t('写作与预览', 'Writing and preview') }}</option><option value="source">{{ t('Markdown 源码', 'Markdown source') }}</option></select></div><div class="setting-row"><span><strong>{{ t('字号', 'Font size') }}</strong></span><input v-model.number="themeStore.fontEditorSize" class="input short" type="number" min="12" max="32" /></div><div class="setting-row"><span><strong>{{ t('行高', 'Line height') }}</strong></span><input v-model.number="themeStore.lineHeight" class="input short" type="number" min="1.2" max="2.4" step="0.1" /></div><div class="setting-row"><span><strong>{{ t('行宽', 'Line width') }}</strong><small>{{ t('Markdown 预览最大字符宽度', 'Maximum character width for Markdown preview') }}</small></span><input v-model.number="settingsStore.editorLineWidth" class="input short" type="number" min="40" max="140" /></div><label class="setting-row"><span><strong>{{ t('拼写检查', 'Spell check') }}</strong><small>{{ t('在写作与源码编辑器中使用系统拼写检查', 'Use system spell checking in visual and source editors') }}</small></span><input v-model="settingsStore.spellCheck" type="checkbox" /></label><MarkdownPreferenceSettings /><HeadingStyleSettings /></div>
 
     <div v-else-if="activeSection === 'providers'" class="settings-section">
       <section class="panel provider-settings-card">