diff --git a/frontend/src/components/common/AppShell.vue b/frontend/src/components/common/AppShell.vue
index 289cfac..b53ab2f 100644
--- a/frontend/src/components/common/AppShell.vue
+++ b/frontend/src/components/common/AppShell.vue
@@ -4,12 +4,11 @@ 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 { useAgentStore } from '@/stores/agent'
 import PrimarySidebar from './PrimarySidebar.vue'
 import SecondarySidebar from './SecondarySidebar.vue'
 import StatusBar from './StatusBar.vue'
 import TitleBar from './TitleBar.vue'
+import CommandPalette from './CommandPalette.vue'
 
 defineProps<{
   showSecondarySidebar?: boolean
@@ -18,8 +17,6 @@ defineProps<{
 const workspaceStore = useWorkspaceStore()
 const themeStore = useThemeStore()
 const editorStore = useEditorStore()
-const settingsStore = useSettingsStore()
-const agentStore = useAgentStore()
 const route = useRoute()
 const router = useRouter()
 
@@ -58,6 +55,7 @@ defineExpose({ openCitation })
       </main>
     </div>
     <StatusBar />
+    <CommandPalette />
   </div>
 </template>
 
diff --git a/frontend/src/components/common/CommandPalette.vue b/frontend/src/components/common/CommandPalette.vue
new file mode 100644
index 0000000..b501f1a
--- /dev/null
+++ b/frontend/src/components/common/CommandPalette.vue
@@ -0,0 +1,101 @@
+<script setup lang="ts">
+import { computed, nextTick, onBeforeUnmount, onMounted, ref } from 'vue'
+import { useRouter } from 'vue-router'
+import { useEditorStore } from '@/stores/editor'
+import { useThemeStore } from '@/stores/theme'
+import { useWorkspaceStore } from '@/stores/workspace'
+import * as workspaceService from '@/services/workspaceService'
+
+const router = useRouter()
+const editorStore = useEditorStore()
+const themeStore = useThemeStore()
+const workspaceStore = useWorkspaceStore()
+const open = ref(false)
+const query = ref('')
+const input = ref<HTMLInputElement | null>(null)
+
+interface Command { id: string; label: string; hint: string; run: () => void | Promise<void> }
+
+const commands = computed<Command[]>(() => [
+  { id: 'workspace', label: '打开工作区', hint: '导航', run: () => router.push('/workspace') },
+  { id: 'search', label: '全局搜索', hint: '导航', run: () => router.push('/search') },
+  { id: 'chat', label: '打开 AI 对话', hint: '导航', run: () => router.push('/chat') },
+  { id: 'agent', label: '创建 Agent Run', hint: '导航', run: () => router.push('/agent/runs') },
+  { id: 'settings', label: '打开设置', hint: '导航', run: () => router.push('/settings') },
+  { id: 'mode', label: `切换为${editorStore.mode === 'source' ? '写作' : '源码'}模式`, hint: '编辑器', run: () => editorStore.toggleMode() },
+  { id: 'save', label: '保存当前笔记', hint: '编辑器', run: () => editorStore.save() },
+  { id: 'theme', label: `切换为${themeStore.isDark ? '浅色' : '深色'}主题`, hint: '外观', run: () => themeStore.toggleTheme() },
+  { id: 'new-note', label: '创建笔记', hint: '工作区', run: createNote },
+])
+
+const filteredCommands = computed(() => {
+  const value = query.value.trim().toLocaleLowerCase()
+  return value ? commands.value.filter((command) => `${command.label} ${command.hint}`.toLocaleLowerCase().includes(value)) : commands.value
+})
+
+function show() {
+  open.value = true
+  query.value = ''
+  void nextTick(() => input.value?.focus())
+}
+
+function hide() { open.value = false }
+
+async function execute(command: Command | undefined) {
+  if (!command) return
+  hide()
+  await command.run()
+}
+
+async function createNote() {
+  const rawName = window.prompt('笔记名称')?.trim()
+  if (!rawName) return
+  const name = rawName.endsWith('.md') ? rawName : `${rawName}.md`
+  const file = await workspaceService.createFile('/', name, `# ${rawName}\n\n`)
+  workspaceStore.addFileToTree('/', file)
+  workspaceStore.openFile(file.path)
+  await editorStore.loadFile(file.path)
+  await router.push('/workspace')
+}
+
+function handleKeydown(event: KeyboardEvent) {
+  if ((event.ctrlKey || event.metaKey) && event.key.toLocaleLowerCase() === 'p') {
+    event.preventDefault()
+    open.value ? hide() : show()
+  } else if (event.key === 'Escape' && open.value) {
+    hide()
+  }
+}
+
+onMounted(() => window.addEventListener('keydown', handleKeydown))
+onBeforeUnmount(() => window.removeEventListener('keydown', handleKeydown))
+</script>
+
+<template>
+  <Teleport to="body">
+    <div v-if="open" class="command-backdrop" @click.self="hide">
+      <section class="command-palette" role="dialog" aria-modal="true" aria-label="命令面板">
+        <input ref="input" v-model="query" class="command-input" placeholder="输入命令…" @keydown.enter.prevent="execute(filteredCommands[0])" />
+        <div class="command-list">
+          <button v-for="command in filteredCommands" :key="command.id" type="button" @click="execute(command)">
+            <span>{{ command.label }}</span><small>{{ command.hint }}</small>
+          </button>
+          <p v-if="!filteredCommands.length">没有匹配的命令</p>
+        </div>
+        <footer><span>Enter 执行</span><span>Esc 关闭</span></footer>
+      </section>
+    </div>
+  </Teleport>
+</template>
+
+<style scoped>
+.command-backdrop { position: fixed; inset: 0; z-index: var(--z-modal); display: flex; justify-content: center; align-items: flex-start; padding-top: 12vh; background: var(--color-background-overlay); }
+.command-palette { width: min(600px, calc(100vw - 32px)); overflow: hidden; border: 1px solid var(--color-border-default); border-radius: var(--radius-lg); background: var(--color-surface-elevated); box-shadow: var(--shadow-xl); }
+.command-input { width: 100%; padding: var(--space-lg); border: 0; border-bottom: 1px solid var(--color-border-default); outline: 0; background: transparent; font-size: var(--font-size-xl); }
+.command-list { max-height: 360px; overflow: auto; padding: var(--space-sm); }
+.command-list button { display: flex; justify-content: space-between; width: 100%; padding: var(--space-md); border-radius: var(--radius-md); text-align: left; }
+.command-list button:hover, .command-list button:focus { outline: 0; background: var(--color-accent-soft); color: var(--color-accent-primary); }
+.command-list small, .command-list p, footer { color: var(--color-text-tertiary); }
+.command-list p { padding: var(--space-xl); text-align: center; }
+footer { display: flex; gap: var(--space-lg); padding: var(--space-sm) var(--space-lg); border-top: 1px solid var(--color-border-subtle); font-size: var(--font-size-xs); }
+</style>
diff --git a/frontend/src/components/common/PrimarySidebar.vue b/frontend/src/components/common/PrimarySidebar.vue
index e5d0047..5aa7886 100644
--- a/frontend/src/components/common/PrimarySidebar.vue
+++ b/frontend/src/components/common/PrimarySidebar.vue
@@ -1,9 +1,10 @@
 <script setup lang="ts">
 import { useRoute, useRouter } from 'vue-router'
-import { computed } from 'vue'
+import { computed, ref } from 'vue'
 
 const route = useRoute()
 const router = useRouter()
+const expanded = ref(localStorage.getItem('primary-sidebar-expanded') === 'true')
 
 const navItems = [
   { name: 'workspace', icon: '📁', label: '工作区' },
@@ -26,10 +27,15 @@ const currentName = computed(() => {
 function navigate(name: string) {
   router.push({ name })
 }
+
+function toggleExpanded() {
+  expanded.value = !expanded.value
+  localStorage.setItem('primary-sidebar-expanded', String(expanded.value))
+}
 </script>
 
 <template>
-  <aside class="primary-sidebar">
+  <aside class="primary-sidebar" :class="{ expanded }">
     <nav class="nav-list">
       <div
         v-for="item in navItems"
@@ -44,9 +50,10 @@ function navigate(name: string) {
       </div>
     </nav>
     <div class="sidebar-footer">
-      <div class="nav-item" @click="navigate('settings')" title="设置">
-        <span class="nav-icon">⚙️</span>
-      </div>
+      <button class="nav-item collapse-button" type="button" :title="expanded ? '收起导航' : '展开导航'" @click="toggleExpanded">
+        <span class="nav-icon">{{ expanded ? '«' : '»' }}</span>
+        <span class="nav-label">{{ expanded ? '收起' : '展开' }}</span>
+      </button>
     </div>
   </aside>
 </template>
@@ -62,6 +69,11 @@ function navigate(name: string) {
   z-index: var(--z-sidebar);
 }
 
+.primary-sidebar.expanded { width: var(--sidebar-primary-width-expanded); }
+.primary-sidebar.expanded .nav-item { flex-direction: row; justify-content: flex-start; gap: var(--space-md); padding: 0 var(--space-lg); }
+.primary-sidebar.expanded .nav-icon { margin-bottom: 0; }
+.primary-sidebar.expanded .nav-label { font-size: var(--font-size-sm); }
+
 .nav-list {
   flex: 1;
   padding: var(--space-sm) 0;
@@ -121,4 +133,6 @@ function navigate(name: string) {
   padding: var(--space-sm) 0;
   border-top: 1px solid var(--color-border-subtle);
 }
+
+.collapse-button { width: calc(100% - 8px); }
 </style>
diff --git a/frontend/src/components/common/SecondarySidebar.vue b/frontend/src/components/common/SecondarySidebar.vue
index 99c5a68..1c51e1f 100644
--- a/frontend/src/components/common/SecondarySidebar.vue
+++ b/frontend/src/components/common/SecondarySidebar.vue
@@ -1,6 +1,11 @@
 <script setup lang="ts">
 import { computed } from 'vue'
 import FileTreePanel from '@/features/workspace/FileTreePanel.vue'
+import ConversationListPanel from '@/features/chat/ConversationListPanel.vue'
+import RunListPanel from '@/features/agent/RunListPanel.vue'
+import SearchFiltersPanel from '@/features/search/SearchFiltersPanel.vue'
+import TaskFiltersPanel from '@/features/tasks/TaskFiltersPanel.vue'
+import ExtensionListPanel from '@/components/common/ExtensionListPanel.vue'
 import { useRoute } from 'vue-router'
 
 const props = defineProps<{
@@ -36,7 +41,11 @@ const showSkillToggle = computed(() => routeName.value === 'skills' || routeName
     </div>
     <div class="sidebar-content">
       <FileTreePanel v-if="component === 'file-tree'" />
-      <p v-else class="sidebar-placeholder">该功能将在对应页面实现时补充。</p>
+      <ConversationListPanel v-else-if="component === 'conversation-list'" />
+      <RunListPanel v-else-if="component === 'run-list'" />
+      <SearchFiltersPanel v-else-if="component === 'search-filters'" />
+      <TaskFiltersPanel v-else-if="component === 'task-filters'" />
+      <ExtensionListPanel v-else-if="component === 'extension-list'" />
     </div>
   </aside>
 </template>
@@ -101,9 +110,4 @@ const showSkillToggle = computed(() => routeName.value === 'skills' || routeName
   overflow-x: hidden;
 }
 
-.sidebar-placeholder {
-  padding: var(--space-lg);
-  color: var(--color-text-tertiary);
-  font-size: var(--font-size-sm);
-}
 </style>
diff --git a/frontend/src/components/common/StatusBar.vue b/frontend/src/components/common/StatusBar.vue
index 825b833..41089d7 100644
--- a/frontend/src/components/common/StatusBar.vue
+++ b/frontend/src/components/common/StatusBar.vue
@@ -75,8 +75,8 @@ const showEditorInfo = computed(() => route.name === 'workspace')
         {{ saveStatusText }}
       </span>
       <span class="status-item" :title="indexStatusText">
-        <span class="status-dot" style="background: var(--color-success)" />
-        索引就绪
+        <span class="status-dot" :style="{ background: settingsStore.indexStatus.status === 'error' ? 'var(--color-error)' : settingsStore.indexStatus.status === 'indexing' ? 'var(--color-warning)' : 'var(--color-success)' }" />
+        {{ indexStatusText }}
       </span>
       <span class="status-item" :style="{ color: aiCoreColor }">
         <span class="status-dot" :style="{ background: aiCoreColor }" />
diff --git a/frontend/src/features/common/PlaceholderView.vue b/frontend/src/features/common/PlaceholderView.vue
deleted file mode 100644
index faf015f..0000000
--- a/frontend/src/features/common/PlaceholderView.vue
+++ /dev/null
@@ -1,34 +0,0 @@
-<script setup lang="ts">
-import { computed } from 'vue'
-import { useRoute } from 'vue-router'
-
-const route = useRoute()
-const title = computed(() => String(route.meta.title ?? '功能开发中'))
-</script>
-
-<template>
-  <section class="placeholder-view">
-    <div>
-      <h1>{{ title }}</h1>
-      <p>基础路由已经就绪，具体页面将在后续功能开发中实现。</p>
-    </div>
-  </section>
-</template>
-
-<style scoped>
-.placeholder-view {
-  display: grid;
-  height: 100%;
-  place-items: center;
-  color: var(--color-text-secondary);
-}
-
-.placeholder-view div {
-  text-align: center;
-}
-
-.placeholder-view h1 {
-  margin: 0 0 var(--space-sm);
-  color: var(--color-text-primary);
-}
-</style>
diff --git a/frontend/src/features/editor/EditorHeader.vue b/frontend/src/features/editor/EditorHeader.vue
index 42a2801..82d0497 100644
--- a/frontend/src/features/editor/EditorHeader.vue
+++ b/frontend/src/features/editor/EditorHeader.vue
@@ -4,12 +4,24 @@ import { useWorkspaceStore } from '@/stores/workspace'
 
 const editorStore = useEditorStore()
 const workspaceStore = useWorkspaceStore()
+
+const statusText: Record<string, string> = {
+  idle: '空闲', dirty: '未保存', saving: '保存中…', saved: '已保存', save_failed: '保存失败',
+  external_changed: '外部文件已变化', conflict: '存在编辑冲突',
+}
 </script>
 
 <template>
   <header class="editor-header">
-    <strong>{{ workspaceStore.activeFile?.name ?? '未命名笔记' }}</strong>
-    <span>{{ editorStore.saveStatus }}</span>
+    <div class="file-identity"><strong>{{ workspaceStore.activeFile?.name ?? '未命名笔记' }}</strong><small>{{ workspaceStore.activeFilePath }}</small></div>
+    <div class="editor-actions">
+      <span class="save-status" :class="editorStore.saveStatus">{{ statusText[editorStore.saveStatus] }}</span>
+      <div class="mode-switch" aria-label="编辑模式">
+        <button type="button" :class="{ active: editorStore.mode === 'wysiwyg' }" @click="editorStore.setMode('wysiwyg')">写作</button>
+        <button type="button" :class="{ active: editorStore.mode === 'source' }" @click="editorStore.setMode('source')">源码</button>
+      </div>
+      <button type="button" class="save-button" :disabled="editorStore.saveStatus === 'saving'" @click="editorStore.save">保存</button>
+    </div>
   </header>
 </template>
 
@@ -23,4 +35,17 @@ const workspaceStore = useWorkspaceStore()
   border-bottom: 1px solid var(--color-border-subtle);
   color: var(--color-text-secondary);
 }
+.file-identity { display: grid; min-width: 0; }
+.file-identity strong, .file-identity small { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.file-identity small { color: var(--color-text-tertiary); font-size: var(--font-size-xs); }
+.editor-actions, .mode-switch { display: flex; align-items: center; gap: var(--space-sm); }
+.save-status { color: var(--color-text-tertiary); font-size: var(--font-size-xs); }
+.save-status.dirty, .save-status.external_changed { color: var(--color-warning); }
+.save-status.save_failed, .save-status.conflict { color: var(--color-error); }
+.save-status.saved { color: var(--color-success); }
+.mode-switch { gap: 2px; padding: 2px; border-radius: var(--radius-md); background: var(--color-background-secondary); }
+.mode-switch button, .save-button { padding: 5px 9px; border-radius: var(--radius-sm); }
+.mode-switch button.active { background: var(--color-surface-primary); color: var(--color-accent-primary); box-shadow: var(--shadow-sm); }
+.save-button { background: var(--color-accent-primary); color: var(--color-text-inverse); }
+.save-button:disabled { opacity: .55; }
 </style>
diff --git a/frontend/src/features/editor/EditorPane.vue b/frontend/src/features/editor/EditorPane.vue
index d4a60ba..f575ee5 100644
--- a/frontend/src/features/editor/EditorPane.vue
+++ b/frontend/src/features/editor/EditorPane.vue
@@ -5,10 +5,12 @@ const editorStore = useEditorStore()
 </script>
 
 <template>
-  <textarea
+<textarea
     class="editor-pane"
+    :class="editorStore.mode"
     :value="editorStore.content"
-    spellcheck="false"
+    :spellcheck="editorStore.mode === 'wysiwyg'"
+    :aria-label="editorStore.mode === 'source' ? 'Markdown 源码编辑器' : 'Markdown 写作编辑器'"
     @input="editorStore.updateContent(($event.target as HTMLTextAreaElement).value); editorStore.scheduleAutoSave()"
   />
 </template>
@@ -26,5 +28,8 @@ const editorStore = useEditorStore()
   color: var(--color-text-primary);
   font: inherit;
   line-height: 1.7;
+  user-select: text;
 }
+.editor-pane.wysiwyg { max-width: 920px; margin: 0 auto; padding: var(--space-3xl) clamp(var(--space-xl), 8vw, 80px); font-family: var(--font-editor-sans); font-size: var(--font-editor-size); line-height: var(--font-editor-line-height); }
+.editor-pane.source { font-family: var(--font-editor-mono); font-size: var(--font-editor-size); line-height: var(--font-editor-line-height); }
 </style>
diff --git a/frontend/src/router/index.ts b/frontend/src/router/index.ts
index 091f4b2..426b5f9 100644
--- a/frontend/src/router/index.ts
+++ b/frontend/src/router/index.ts
@@ -1,6 +1,5 @@
 import { createRouter, createWebHashHistory } from 'vue-router'
 import { useWorkspaceStore } from '@/stores/workspace'
-import PlaceholderView from '@/features/common/PlaceholderView.vue'
 
 const routes = [
   {
@@ -18,49 +17,49 @@ const routes = [
   {
     path: '/search',
     name: 'search',
-    component: PlaceholderView,
+    component: () => import('@/features/search/SearchView.vue'),
     meta: { title: '搜索', requiresVault: true },
   },
   {
     path: '/chat',
     name: 'chat',
-    component: PlaceholderView,
+    component: () => import('@/features/chat/ChatView.vue'),
     meta: { title: 'AI 对话', requiresVault: true },
   },
   {
     path: '/agent/runs/:runId?',
     name: 'agent',
-    component: PlaceholderView,
+    component: () => import('@/features/agent/AgentView.vue'),
     meta: { title: 'Agent Trace', requiresVault: true },
   },
   {
     path: '/tasks',
     name: 'tasks',
-    component: PlaceholderView,
+    component: () => import('@/features/tasks/TasksView.vue'),
     meta: { title: '任务', requiresVault: true },
   },
   {
     path: '/extensions/skills',
     name: 'skills',
-    component: PlaceholderView,
+    component: () => import('@/features/skills/SkillsView.vue'),
     meta: { title: 'Skill 管理', requiresVault: true },
   },
   {
     path: '/extensions/plugins',
     name: 'plugins',
-    component: PlaceholderView,
+    component: () => import('@/features/plugins/PluginsView.vue'),
     meta: { title: 'Plugin 管理', requiresVault: true },
   },
   {
     path: '/themes',
     name: 'themes',
-    component: PlaceholderView,
+    component: () => import('@/features/themes/ThemesView.vue'),
     meta: { title: '主题管理', requiresVault: true },
   },
   {
     path: '/settings',
     name: 'settings',
-    component: PlaceholderView,
+    component: () => import('@/features/settings/SettingsView.vue'),
     meta: { title: '设置', requiresVault: true },
   },
 ]