diff --git a/frontend/src/components/common/AppShell.vue b/frontend/src/components/common/AppShell.vue
index b53ab2f..fe7c007 100644
--- a/frontend/src/components/common/AppShell.vue
+++ b/frontend/src/components/common/AppShell.vue
@@ -1,9 +1,10 @@
 <script setup lang="ts">
-import { computed } from 'vue'
+import { computed, onMounted, watch } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import { useWorkspaceStore } from '@/stores/workspace'
 import { useThemeStore } from '@/stores/theme'
 import { useEditorStore } from '@/stores/editor'
+import { useSettingsStore } from '@/stores/settings'
 import PrimarySidebar from './PrimarySidebar.vue'
 import SecondarySidebar from './SecondarySidebar.vue'
 import StatusBar from './StatusBar.vue'
@@ -17,9 +18,16 @@ defineProps<{
 const workspaceStore = useWorkspaceStore()
 const themeStore = useThemeStore()
 const editorStore = useEditorStore()
+const settingsStore = useSettingsStore()
 const route = useRoute()
 const router = useRouter()
 
+onMounted(() => { void settingsStore.loadDiagnostics() })
+watch(() => settingsStore.defaultEditorMode, (mode) => editorStore.setMode(mode), { immediate: true })
+watch(() => settingsStore.editorLineWidth, (width) => {
+  document.documentElement.style.setProperty('--editor-line-width', `${width}ch`)
+}, { immediate: true })
+
 const routeName = computed(() => route.name as string)
 
 const secondaryComponent = computed(() => {
diff --git a/frontend/src/components/common/PrimarySidebar.vue b/frontend/src/components/common/PrimarySidebar.vue
index 5aa7886..8a24394 100644
--- a/frontend/src/components/common/PrimarySidebar.vue
+++ b/frontend/src/components/common/PrimarySidebar.vue
@@ -19,9 +19,7 @@ const navItems = [
 ]
 
 const currentName = computed(() => {
-  const name = route.name as string
-  if (name === 'skills' || name === 'plugins') return 'skills'
-  return name
+  return route.name as string
 })
 
 function navigate(name: string) {
diff --git a/frontend/src/features/settings/SettingsView.vue b/frontend/src/features/settings/SettingsView.vue
index 4469f19..6462c36 100644
--- a/frontend/src/features/settings/SettingsView.vue
+++ b/frontend/src/features/settings/SettingsView.vue
@@ -3,6 +3,7 @@ import { onMounted, reactive, ref } from 'vue'
 import type { ProviderConfig, ProviderType } from '@/contracts'
 import { useProviderStore } from '@/stores/provider'
 import { useSettingsStore } from '@/stores/settings'
+import { useThemeStore } from '@/stores/theme'
 
 type Section = 'general' | 'editor' | 'providers' | 'index' | 'permissions' | 'ai-core'
 const sections: Array<{ id: Section; label: string }> = [
@@ -12,6 +13,7 @@ const sections: Array<{ id: Section; label: string }> = [
 const activeSection = ref<Section>('general')
 const settingsStore = useSettingsStore()
 const providerStore = useProviderStore()
+const themeStore = useThemeStore()
 const showProviderForm = ref(false)
 const editingProviderId = ref<string | null>(null)
 const providerAction = ref('')
@@ -43,7 +45,7 @@ async function testProvider(provider: ProviderConfig) { testResults.value[provid
 
     <div v-if="activeSection === 'general'" class="panel settings-section"><h2>通用</h2><label class="setting-row"><span><strong>恢复上次 Vault</strong><small>启动后自动打开最近使用的知识库</small></span><input v-model="settingsStore.restoreLastVault" type="checkbox" /></label><div class="setting-row"><span><strong>自动保存间隔</strong><small>编辑停止后等待多久写入文件</small></span><select v-model.number="settingsStore.autoSaveInterval" class="select short"><option :value="500">0.5 秒</option><option :value="1500">1.5 秒</option><option :value="3000">3 秒</option></select></div><div class="setting-row"><span><strong>界面语言</strong><small>当前阶段支持中文和英文入口</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>版本</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>编辑器</h2><div class="setting-row"><span><strong>默认模式</strong><small>新打开文件使用的编辑器模式</small></span><select v-model="settingsStore.defaultEditorMode" class="select short"><option value="wysiwyg">所见即所得</option><option value="source">Markdown 源码</option></select></div><div class="setting-row"><span><strong>字号</strong></span><input v-model.number="settingsStore.editorFontSize" class="input short" type="number" min="12" max="32" /></div><div class="setting-row"><span><strong>行高</strong></span><input v-model.number="settingsStore.editorLineHeight" class="input short" type="number" min="1.2" max="2.4" step="0.1" /></div><div class="setting-row"><span><strong>行宽</strong><small>正文最大字符宽度</small></span><input v-model.number="settingsStore.editorLineWidth" class="input short" type="number" min="40" max="140" /></div><label class="setting-row"><span><strong>拼写检查</strong></span><input v-model="settingsStore.spellCheck" type="checkbox" /></label></div>
+    <div v-else-if="activeSection === 'editor'" class="panel settings-section"><h2>编辑器</h2><div class="setting-row"><span><strong>默认模式</strong><small>新打开文件使用的编辑器模式</small></span><select v-model="settingsStore.defaultEditorMode" class="select short"><option value="wysiwyg">写作与预览</option><option value="source">Markdown 源码</option></select></div><div class="setting-row"><span><strong>字号</strong></span><input v-model.number="themeStore.fontEditorSize" class="input short" type="number" min="12" max="32" /></div><div class="setting-row"><span><strong>行高</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>行宽</strong><small>Markdown 预览最大字符宽度</small></span><input v-model.number="settingsStore.editorLineWidth" class="input short" type="number" min="40" max="140" /></div><label class="setting-row"><span><strong>拼写检查</strong></span><input v-model="settingsStore.spellCheck" type="checkbox" /></label></div>
 
     <div v-else-if="activeSection === 'providers'" class="settings-section"><div class="section-head"><h2>模型提供商</h2><button class="button-primary" @click="openProvider()">新增 Provider</button></div><div v-if="providerStore.error || providerAction" class="error-banner">{{ providerStore.error || providerAction }}</div><div class="provider-list"><article v-for="provider in providerStore.providers" :key="provider.provider_id" class="item-card provider-card"><div><div class="inline-actions"><strong>{{ provider.name }}</strong><span class="badge" :class="{ success: provider.enabled }">{{ provider.provider_type }}</span></div><p class="subtle">{{ provider.base_url || '本地内置' }} · 默认模型 {{ provider.default_model || '未设置' }}</p><div class="tag-list"><span v-for="(_, capability) in provider.capabilities" :key="capability" class="badge">{{ capability }}</span></div><p v-if="testResults[provider.provider_id]" class="test-result">{{ testResults[provider.provider_id] }}</p></div><div class="inline-actions"><button class="button-secondary" @click="testProvider(provider)">测试</button><button class="button-secondary" @click="openProvider(provider)">编辑</button><button class="button-danger" :disabled="provider.provider_id === 'mock'" @click="removeProvider(provider)">删除</button></div></article></div></div>
 
diff --git a/frontend/src/features/vault/VaultEntry.vue b/frontend/src/features/vault/VaultEntry.vue
index 0e908dc..8f5995b 100644
--- a/frontend/src/features/vault/VaultEntry.vue
+++ b/frontend/src/features/vault/VaultEntry.vue
@@ -17,7 +17,12 @@ const newVaultPath = ref('')
 const aiCoreStatus = ref<'checking' | 'running' | 'stopped'>('checking')
 
 onMounted(async () => {
-  await workspaceStore.loadRecentVaults()
+  await Promise.all([workspaceStore.loadRecentVaults(), settingsStore.loadDiagnostics()])
+  const lastVaultPath = localStorage.getItem('last-vault-path')
+  if (settingsStore.restoreLastVault && lastVaultPath) {
+    await openVault(lastVaultPath)
+    return
+  }
   setTimeout(() => {
     aiCoreStatus.value = settingsStore.aiCoreStatus === 'running' ? 'running' : 'stopped'
   }, 800)
diff --git a/frontend/src/stores/search.ts b/frontend/src/stores/search.ts
index 03cae07..754563a 100644
--- a/frontend/src/stores/search.ts
+++ b/frontend/src/stores/search.ts
@@ -2,6 +2,12 @@ import { defineStore } from 'pinia'
 import { ref } from 'vue'
 import type { SearchResult, SearchRequest } from '@/contracts'
 import * as searchService from '@/services/searchService'
+import { ApiErrorClass } from '@/services/apiClient'
+
+const VECTOR_ERROR_CODES = new Set([
+  'VECTOR_UNAVAILABLE', 'EMBEDDING_UNAVAILABLE', 'INDEX_UNAVAILABLE',
+  'MODEL_NOT_FOUND', 'MODEL_CAPABILITY_MISMATCH', 'PROVIDER_UNAVAILABLE',
+])
 
 export const useSearchStore = defineStore('search', () => {
   const query = ref('')
@@ -19,16 +25,33 @@ export const useSearchStore = defineStore('search', () => {
     mode.value = request.mode || 'hybrid'
     isSearching.value = true
     error.value = null
+    vectorUnavailable.value = false
 
     try {
       const resp = await searchService.search(request)
       results.value = resp.results
       total.value = resp.total
       selectedIndex.value = 0
-    } catch (e: any) {
-      error.value = e.message || '搜索失败'
-      results.value = []
-      total.value = 0
+    } catch (reason) {
+      const canFallback = mode.value !== 'fts' && reason instanceof ApiErrorClass && VECTOR_ERROR_CODES.has(reason.code)
+      if (canFallback) {
+        try {
+          const fallback = await searchService.search({ ...request, mode: 'fts' })
+          results.value = fallback.results
+          total.value = fallback.total
+          mode.value = 'fts'
+          vectorUnavailable.value = true
+          selectedIndex.value = 0
+        } catch (fallbackError) {
+          error.value = fallbackError instanceof Error ? fallbackError.message : '全文检索降级失败'
+          results.value = []
+          total.value = 0
+        }
+      } else {
+        error.value = reason instanceof Error ? reason.message : '搜索失败'
+        results.value = []
+        total.value = 0
+      }
     } finally {
       isSearching.value = false
     }
diff --git a/frontend/src/stores/settings.ts b/frontend/src/stores/settings.ts
index 5266aba..b2fce1c 100644
--- a/frontend/src/stores/settings.ts
+++ b/frontend/src/stores/settings.ts
@@ -1,24 +1,26 @@
 import { defineStore } from 'pinia'
-import { ref } from 'vue'
+import { ref, watch } from 'vue'
 import type { AiCoreStatus, IndexStatus } from '@/contracts'
 import { mockIndexStatus } from '@/services/indexService'
 import * as indexService from '@/services/indexService'
 import * as systemService from '@/services/systemService'
 
 export const useSettingsStore = defineStore('settings', () => {
+  const saved = (() => {
+    try { return JSON.parse(localStorage.getItem('app-settings') ?? '{}') as Record<string, unknown> }
+    catch { localStorage.removeItem('app-settings'); return {} }
+  })()
   // General
-  const restoreLastVault = ref(true)
-  const autoSaveInterval = ref(1500)
-  const language = ref<'zh-CN' | 'en'>('zh-CN')
+  const restoreLastVault = ref(saved.restoreLastVault !== false)
+  const autoSaveInterval = ref(typeof saved.autoSaveInterval === 'number' ? saved.autoSaveInterval : 1500)
+  const language = ref<'zh-CN' | 'en'>(saved.language === 'en' ? 'en' : 'zh-CN')
   const appVersion = ref('0.1.0')
   const aiCoreVersion = ref('0.1.0')
 
   // Editor
-  const defaultEditorMode = ref<'wysiwyg' | 'source'>('wysiwyg')
-  const editorFontSize = ref(15)
-  const editorLineHeight = ref(1.7)
-  const editorLineWidth = ref(80)
-  const spellCheck = ref(false)
+  const defaultEditorMode = ref<'wysiwyg' | 'source'>(saved.defaultEditorMode === 'source' ? 'source' : 'wysiwyg')
+  const editorLineWidth = ref(typeof saved.editorLineWidth === 'number' ? saved.editorLineWidth : 80)
+  const spellCheck = ref(saved.spellCheck === true)
 
   // AI Core
   const aiCoreStatus = ref<AiCoreStatus>('running')
@@ -41,6 +43,12 @@ export const useSettingsStore = defineStore('settings', () => {
   })
   const diagnosticsError = ref<string | null>(null)
 
+  watch(() => ({
+    restoreLastVault: restoreLastVault.value, autoSaveInterval: autoSaveInterval.value,
+    language: language.value, defaultEditorMode: defaultEditorMode.value,
+    editorLineWidth: editorLineWidth.value, spellCheck: spellCheck.value,
+  }), (value) => localStorage.setItem('app-settings', JSON.stringify(value)), { deep: true })
+
   async function loadDiagnostics() {
     try {
       const [health, status, index] = await Promise.all([
@@ -97,8 +105,6 @@ export const useSettingsStore = defineStore('settings', () => {
     appVersion,
     aiCoreVersion,
     defaultEditorMode,
-    editorFontSize,
-    editorLineHeight,
     editorLineWidth,
     spellCheck,
     aiCoreStatus,
diff --git a/frontend/src/stores/theme.ts b/frontend/src/stores/theme.ts
index 940b5fd..8fcf86f 100644
--- a/frontend/src/stores/theme.ts
+++ b/frontend/src/stores/theme.ts
@@ -37,6 +37,15 @@ export const useThemeStore = defineStore('theme', () => {
   }
 
   function initTheme() {
+    const savedAppearance = localStorage.getItem('editor-appearance')
+    if (savedAppearance) {
+      try {
+        const value = JSON.parse(savedAppearance) as { size?: number; family?: string; lineHeight?: number }
+        if (value.size) fontEditorSize.value = value.size
+        if (value.family) fontEditorFamily.value = value.family
+        if (value.lineHeight) lineHeight.value = value.lineHeight
+      } catch { localStorage.removeItem('editor-appearance') }
+    }
     const saved = localStorage.getItem('theme')
     if (saved && themes.value.find((t) => t.theme_id === saved)) {
       applyTheme(saved)
@@ -57,13 +66,24 @@ export const useThemeStore = defineStore('theme', () => {
     lineHeight.value = 1.7
   }
 
+  const persistAppearance = () => localStorage.setItem('editor-appearance', JSON.stringify({
+    size: fontEditorSize.value, family: fontEditorFamily.value, lineHeight: lineHeight.value,
+  }))
+
   watch(fontEditorSize, (v) => {
     document.documentElement.style.setProperty('--font-editor-size', `${v}px`)
-  })
+    persistAppearance()
+  }, { immediate: true })
 
   watch(lineHeight, (v) => {
     document.documentElement.style.setProperty('--font-editor-line-height', String(v))
-  })
+    persistAppearance()
+  }, { immediate: true })
+
+  watch(fontEditorFamily, (v) => {
+    document.documentElement.style.setProperty('--font-editor-sans', v)
+    persistAppearance()
+  }, { immediate: true })
 
   return {
     themes,
diff --git a/frontend/src/styles/tokens.css b/frontend/src/styles/tokens.css
index 368ac80..8e3156b 100644
--- a/frontend/src/styles/tokens.css
+++ b/frontend/src/styles/tokens.css
@@ -158,6 +158,26 @@
   --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);
 }
 
+[data-theme='sepia'] {
+  --color-background-primary: #fbf3df;
+  --color-background-secondary: #f4e8ca;
+  --color-background-tertiary: #eadbb8;
+  --color-background-hover: #eee0bf;
+  --color-background-active: #e3d1aa;
+  --color-surface-primary: #fff8e8;
+  --color-surface-secondary: #f8edd3;
+  --color-surface-elevated: #fffaf0;
+  --color-text-primary: #40372b;
+  --color-text-secondary: #746653;
+  --color-text-tertiary: #9a8a72;
+  --color-border-default: #ddcfad;
+  --color-border-subtle: #eadfc4;
+  --color-accent-primary: #8a5b32;
+  --color-accent-primary-hover: #704724;
+  --color-accent-soft: #edddbd;
+  --color-text-link: #7b512e;
+}
+
 * {
   box-sizing: border-box;
   margin: 0;