diff --git a/crates/df-storage/src/crud.rs b/crates/df-storage/src/crud.rs
index 80d3c28..fee1a64 100644
--- a/crates/df-storage/src/crud.rs
+++ b/crates/df-storage/src/crud.rs
@@ -1339,6 +1339,28 @@ impl KnowledgeEventsRepo {
 // AiConversationRepo 的整体更新已由 impl_repo! 宏统一生成的 update_full 提供。
 
 impl AiConversationRepo {
+    /// 清空对话消息内容(保留 conversation 记录本身,只清 messages JSON + 清零 token 计数)
+    ///
+    /// "清空对话"语义:对话壳保留(侧栏仍可见,可继续在该对话内聊),仅清空历史消息。
+    /// messages 是 ai_conversations 表内的 JSON 列而非独立行,故"删 messages"= 置空该列。
+    pub async fn clear_messages(&self, id: &str) -> Result<bool> {
+        let conn = self.conn.clone();
+        let id = id.to_owned();
+        let now = now_millis_str();
+        tokio::task::spawn_blocking(move || {
+            let guard = conn.blocking_lock();
+            let affected = guard
+                .execute(
+                    "UPDATE ai_conversations SET messages = '[]', prompt_tokens = 0, completion_tokens = 0, updated_at = ?1 WHERE id = ?2",
+                    params![now, id],
+                )
+                .map_err(|e| Error::Storage(e.to_string()))?;
+            Ok(affected > 0)
+        })
+        .await
+        .map_err(|e| Error::Storage(e.to_string()))?
+    }
+
     /// 设置归档标记(仅改 archived,不动 updated_at)
     ///
     /// 区别于 update_field(后者强制 SET updated_at=now,会把归档/取消归档误判为内容更新,
diff --git a/src-tauri/src/commands/ai/commands.rs b/src-tauri/src/commands/ai/commands.rs
index d6baec9..8bcf19a 100644
--- a/src-tauri/src/commands/ai/commands.rs
+++ b/src-tauri/src/commands/ai/commands.rs
@@ -214,8 +214,19 @@ pub async fn ai_pending_tool_calls(
 #[tauri::command]
 pub async fn ai_chat_clear(state: State<'_, AppState>) -> Result<(), String> {
     let mut session = state.ai_session.lock().await;
+    // 取活跃对话 id 后释放锁(避免持 session 锁调 DB)
+    let active_id = session.active_conversation_id.clone();
     session.messages.clear();
     session.pending_approvals.clear();
+    drop(session);
+    // 真删 DB:清空该对话 messages JSON + 清零 token(保留对话壳),刷新不再恢复(AR-7)
+    if let Some(id) = active_id {
+        state
+            .ai_conversations
+            .clear_messages(&id)
+            .await
+            .map_err(|e| e.to_string())?;
+    }
     Ok(())
 }
 
diff --git a/src/components/AiChat.vue b/src/components/AiChat.vue
index 92ff771..f6b8fe8 100644
--- a/src/components/AiChat.vue
+++ b/src/components/AiChat.vue
@@ -103,6 +103,10 @@
           <button class="ai-btn-icon" @click="store.newConversation()" :title="$t('aiChat.newConversation')">
             <svg width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><path d="M12 20h9"/><path d="M16.5 3.5a2.121 2.121 0 013 3L7 19l-4 1 1-4L16.5 3.5z"/></svg>
           </button>
+          <!-- 清空对话(真删 DB messages,带二次确认防误删) -->
+          <button class="ai-btn-icon" @click="confirmClearChat" title="清空">
+            <svg width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><polyline points="3 6 5 6 21 6"/><path d="M19 6l-1 14a2 2 0 01-2 2H8a2 2 0 01-2-2L5 6"/><path d="M10 11v6"/><path d="M14 11v6"/><path d="M9 6V4a1 1 0 011-1h4a1 1 0 011 1v2"/></svg>
+          </button>
           <!-- 嵌入模式：最大化/还原 + 分离 + 关闭 -->
           <template v-if="!props.detached">
             <button class="ai-btn-icon" @click="store.toggleMaximize()" :title="store.state.maximized ? $t('aiChat.restoreSidebar') : $t('aiChat.maximize')">
@@ -386,6 +390,13 @@ async function confirmDeleteConversation(id: string) {
   store.deleteConversation(id)
 }
 
+/** 清空当前对话(真删 DB messages,带二次确认防误删) */
+async function confirmClearChat() {
+  // i18n 不在本任务白名单:文案硬编码,后续补 aiChat.confirmClearChat key
+  if (!await confirmDialog('确定清空当前对话的所有消息？此操作不可恢复。')) return
+  await store.clearChat()
+}
+
 // ── 技能 `/` 联想 ──
 const skillOpen = ref(false)
 const skillIndex = ref(0)
diff --git a/src/composables/ai/useAiEvents.ts b/src/composables/ai/useAiEvents.ts
index 896b0bf..874b314 100644
--- a/src/composables/ai/useAiEvents.ts
+++ b/src/composables/ai/useAiEvents.ts
@@ -14,11 +14,16 @@ import { listen, emit } from '@tauri-apps/api/event'
 import { aiApi } from '../../api'
 import { useAppSettingsStore } from '../../stores/appSettings'
 import { state } from '../../stores/ai'
+import i18n from '../../i18n'
 import { resetStreamWatchdog, clearStreamWatchdog } from './useAiStream'
 import { drainQueue } from './useAiSend'
 import { loadConversations } from './useAiConversations'
 import type { AiChatEvent, AiToolCallInfo } from '../../api/types'
 
+// composable 内非组件上下文(无 setup),用 vue-i18n 全局实例的 t 而非 useI18n()。
+// 通过 any 中转规避 vue-i18n 深度 message schema 泛型导致的 TS2589(类型实例化过深)。
+const t = ((i18n as any).global.t as (key: string) => string).bind((i18n as any).global)
+
 let _unlistenAiEvent: (() => void) | null = null
 let _unlistenConvChanged: (() => void) | null = null
 // startListener 并发去重:防 onMounted 与 sendMessage 首发竞态下重复注册 listener
@@ -40,10 +45,10 @@ export function notifyConversationChanged() {
 
 /** 后端原始错误转用户友好提示 */
 export function friendlyError(raw: string): string {
-  if (/404|not\s*found/i.test(raw)) return '调用失败:接口地址或模型不存在,请检查 Provider 配置'
-  if (/401|403|unauthorized|api[_\s-]?key/i.test(raw)) return '调用失败:API Key 无效或无权限'
-  if (/timeout|超时/i.test(raw)) return '响应超时,请重试'
-  if (/network|connection|ECONN|网络|连接/i.test(raw)) return '网络连接失败,请检查网络'
+  if (/404|not\s*found/i.test(raw)) return t('ai.errorNotFound')
+  if (/401|403|unauthorized|api[_\s-]?key/i.test(raw)) return t('ai.errorAuth')
+  if (/timeout|超时/i.test(raw)) return t('ai.errorTimeout')
+  if (/network|connection|ECONN|网络|连接/i.test(raw)) return t('ai.errorNetwork')
   return raw
 }
 
diff --git a/src/composables/ai/useAiSend.ts b/src/composables/ai/useAiSend.ts
index d62c127..b38b543 100644
--- a/src/composables/ai/useAiSend.ts
+++ b/src/composables/ai/useAiSend.ts
@@ -12,7 +12,7 @@
 import { aiApi } from '../../api'
 import { useAppSettingsStore } from '../../stores/appSettings'
 import { state } from '../../stores/ai'
-import { resetStreamWatchdog } from './useAiStream'
+import { resetStreamWatchdog, clearStreamWatchdog } from './useAiStream'
 import { startListener } from './useAiEvents'
 import { nextMsgId } from './useAiEvents'
 
@@ -107,8 +107,12 @@ function clearQueue() {
   state.queue = []
 }
 
-/** 停止当前生成：仅发停止信号，streaming 状态由后端 AiCompleted 事件收尾 */
+/** 停止当前生成：本地先复位 streaming，再发停止信号。
+ *  不依赖后端 AiCompleted 收尾——审批态看门狗已 clear(useAiEvents)，若 AiCompleted 竞态丢失则 streaming 永久 true 卡死，故本地兜底。
+ */
 async function stopChat() {
+  state.streaming = false // 本地先复位，不依赖后端 AiCompleted（审批态看门狗已 clear，竞态丢失则卡死）
+  clearStreamWatchdog() // 清残留看门狗
   await aiApi.stopChat()
 }
 
diff --git a/src/i18n/en/ai.ts b/src/i18n/en/ai.ts
index 034b64f..47e4694 100644
--- a/src/i18n/en/ai.ts
+++ b/src/i18n/en/ai.ts
@@ -6,5 +6,9 @@ export default {
       listDirectory: 'List Directory',
       writeFile: 'Write File',
     },
+    errorNotFound: 'Request failed: the endpoint or model does not exist. Please check the Provider configuration.',
+    errorAuth: 'Request failed: the API key is invalid or lacks permission.',
+    errorTimeout: 'The response timed out. Please try again.',
+    errorNetwork: 'Network connection failed. Please check your network.',
   },
 }
diff --git a/src/i18n/zh-CN/ai.ts b/src/i18n/zh-CN/ai.ts
index 96d1917..b66c568 100644
--- a/src/i18n/zh-CN/ai.ts
+++ b/src/i18n/zh-CN/ai.ts
@@ -6,5 +6,9 @@ export default {
       listDirectory: '查看目录',
       writeFile: '写入文件',
     },
+    errorNotFound: '调用失败:接口地址或模型不存在,请检查 Provider 配置',
+    errorAuth: '调用失败:API Key 无效或无权限',
+    errorTimeout: '响应超时,请重试',
+    errorNetwork: '网络连接失败,请检查网络',
   },
 }