feat: 优化 todo_write 工具的 merge 参数描述，调整默认值逻辑并添加测试

src/gateway/todo_prompt_provider.rs

@@ -27,8 +27,8 @@ const TODO_WRITE_INSTRUCTIONS: &str = r#"
 - 不需要为简单的单步操作（如回答一个问题、读取一个文件）创建 todo
 
 ### merge 参数
-- `merge: false`（默认）：全量替换 — 只传入需要追踪的 todo，不在列表中的项将被移除
-- `merge: true`（推荐）：增量更新 — 只传入需要添加或更新的项，未提及的项保持不变。**绝大多数情况应该使用 merge=true**
+- `merge: true`（默认，推荐）：增量更新 — 只传入需要添加或更新的项，未提及的项保持不变。**绝大多数情况使用默认即可**
+- `merge: false`：全量替换 — 只传入需要追踪的 todo，不在列表中的项将被移除
 
 ### 状态语义
 - `pending` — 尚未开始

src/protocol/ws_adapter.rs

@@ -26,6 +26,7 @@ pub(crate) fn ws_outbound_from_chat_message(message: &ChatMessage) -> Vec<WsOutb
                         topic_id: None,
                         timestamp: None,
                         reasoning_content: message.reasoning_content.clone(),
+                        user_message_id: None,
                     });
                 }
 
@@ -42,6 +43,7 @@ pub(crate) fn ws_outbound_from_chat_message(message: &ChatMessage) -> Vec<WsOutb
                     topic_id: None,
                     timestamp: None,
                     reasoning_content: tc_reasoning.clone(),
+                    user_message_id: None,
                 }));
                 outbound
             } else {
@@ -54,6 +56,7 @@ pub(crate) fn ws_outbound_from_chat_message(message: &ChatMessage) -> Vec<WsOutb
                     topic_id: None,
                     timestamp: None,
                     reasoning_content: message.reasoning_content.clone(),
+                    user_message_id: None,
                 }]
             }
         }

src/tools/session_send.rs

@@ -456,7 +456,7 @@ fn parse_attachments(value: &serde_json::Value) -> anyhow::Result<Vec<MediaItem>
             return Err(anyhow!("attachment file is empty: {}", raw_path));
         }
 
-        let content_base64 = (metadata.len() <= 50 * 1024 * 1024)
+        let content_base64 = (metadata.len() <= 200 * 1024 * 1024)
             .then(|| {
                 let mut file = std::fs::File::open(&resolved_path)?;
                 let mut buf = Vec::with_capacity(metadata.len() as usize);

src/tools/todo_write.rs

@@ -77,9 +77,9 @@ impl Tool for TodoWriteTool {
 
     fn description(&self) -> &str {
         "Manage a structured task list for tracking work within the current conversation. \
-        Two modes: merge=false (default, full replacement — omitted items are removed); \
-        merge=true (incremental — only send the items you want to add/update, \
-        previously existing items are preserved). \
+        Two modes: merge=true (default, incremental — only send the items you want to add/update, \
+        previously existing items are preserved); \
+        merge=false (full replacement — omitted items are removed). \
         Use when you have 3+ distinct steps to track. \
         Rules: only ONE in_progress at a time, complete work before marking completed, \
         every item requires an id (generate a short random string for new items)."
@@ -91,7 +91,7 @@ impl Tool for TodoWriteTool {
             "properties": {
                 "merge": {
                     "type": "boolean",
-                    "description": "false (default): full replacement — todos not in the list are removed. true: incremental — only send items you want to add or update, existing items not mentioned are preserved."
+                    "description": "true (default): incremental — only send items you want to add or update, existing items not mentioned are preserved. false: full replacement — todos not in the list are removed."
                 },
                 "todos": {
                     "type": "array",
@@ -156,7 +156,7 @@ impl Tool for TodoWriteTool {
         let merge_mode = args
             .get("merge")
             .and_then(|v| v.as_bool())
-            .unwrap_or(false);
+            .unwrap_or(true);
 
         // 3. 读锁获取旧状态
         let old_items = {
@@ -754,11 +754,12 @@ mod tests {
             .await
             .unwrap();
 
-        // 只传入一个任务（任务B 被移除）
+        // 全量替换：只传入一个任务（任务B 被移除）
         let result = tool
             .execute_with_context(
                 &context,
                 json!({
+                    "merge": false,
                     "todos": [
                         {"id": "i1", "content": "任务A", "status": "in_progress"}
                     ]
@@ -1054,11 +1055,12 @@ mod tests {
             .await
             .unwrap();
 
-        // merge=false（默认）— 只传一个，另一个被删
+        // 显式指定 merge=false — 只传一个，另一个被删
         let result = tool
             .execute_with_context(
                 &context,
                 json!({
+                    "merge": false,
                     "todos": [
                         {"id": "p1", "content": "任务A", "status": "in_progress"}
                     ]
@@ -1140,4 +1142,45 @@ mod tests {
         assert!(!result.success);
         assert!(result.error.unwrap().contains("missing or empty 'id'"));
     }
+
+    #[tokio::test]
+    async fn test_default_is_merge_mode() {
+        let state = test_state();
+        let tool = TodoWriteTool::new(state.clone());
+        let context = test_context();
+
+        // 先创建 2 个 todo
+        let _ = tool
+            .execute_with_context(
+                &context,
+                json!({
+                    "todos": [
+                        {"id": "x1", "content": "任务A", "status": "pending"},
+                        {"id": "x2", "content": "任务B", "status": "pending"}
+                    ]
+                }),
+            )
+            .await
+            .unwrap();
+
+        // 不传 merge 参数，只更新一项 — 默认应为 merge=true，旧项保留
+        let result = tool
+            .execute_with_context(
+                &context,
+                json!({
+                    "todos": [
+                        {"id": "x1", "content": "任务A", "status": "in_progress"}
+                    ]
+                }),
+            )
+            .await
+            .unwrap();
+
+        assert!(result.success);
+        let output: serde_json::Value = serde_json::from_str(&result.output).unwrap();
+        let todos = output["current_todos"].as_array().unwrap();
+        assert_eq!(todos.len(), 2); // 默认 merge，旧项保留
+        let task_a = todos.iter().find(|t| t["id"] == "x1").unwrap();
+        assert_eq!(task_a["status"], "in_progress");
+    }
 }

web/src/App.tsx

@@ -1,5 +1,5 @@
 import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
-import { Zap, ArrowLeft, Bot, Clock, Sun, Moon, PanelRightOpen, X, Brain, Settings as SettingsIcon, ChevronRight } from 'lucide-react'
+import { Zap, ArrowLeft, Bot, Clock, Sun, Moon, PanelRightOpen, PanelLeftClose, PanelLeftOpen, X, Brain, Settings as SettingsIcon, ChevronRight } from 'lucide-react'
 import { ChatContainer } from './components/Chat/ChatContainer'
 import { TopicList } from './components/Sidebar/TopicList'
 import { SchedulerJobList } from './components/Sidebar/SchedulerJobList'
@@ -120,6 +120,22 @@ function App() {
 
   const [rightPanelTab, setRightPanelTab] = useState<'memory' | 'skill'>('memory')
 
+  const [sidebarCollapsed, setSidebarCollapsed] = useState(() => {
+    try {
+      return localStorage.getItem('picobot-sidebar-collapsed') === 'true'
+    } catch {
+      return false
+    }
+  })
+
+  const toggleSidebar = useCallback(() => {
+    setSidebarCollapsed(prev => {
+      const next = !prev
+      localStorage.setItem('picobot-sidebar-collapsed', String(next))
+      return next
+    })
+  }, [])
+
   const [theme, setTheme] = useState<'dark' | 'light'>(() => {
     const saved = localStorage.getItem('picobot-theme')
     return saved === 'light' ? 'light' : 'dark'
@@ -486,10 +502,10 @@ function App() {
       }
     }
 
-    // 过滤无实质内容的 merged_tool（无结果且非等待中）
+    // 过滤无实质内容的 merged_tool：result 到达后才显示保留；calling/pending 有 callContent 也保留
     return result.filter(msg => {
       if (msg.type !== 'merged_tool') return true
-      if (msg.status === 'pending') return true
+      if (msg.status === 'calling' || msg.status === 'pending') return true
       return !!(msg.resultContent && msg.resultContent.trim())
     })
   }, [messages])
@@ -562,13 +578,52 @@ function App() {
 
       {/* Main Content */}
       <div className="flex flex-1 overflow-hidden relative">
-        {/* Left Sidebar */}
-        <div className={`w-72 shrink-0 border-r border-[var(--border-color)] bg-[var(--bg-secondary)]/50 flex flex-col ${subAgentView || schedulerView ? 'opacity-50 pointer-events-none' : ''}`}>
-          {/* Tab 栏 */}
-          <div className="flex border-b border-[var(--border-color)]">
+        {/* Left Sidebar — smooth width animation via will-change + overflow-hidden */}
+        <div
+          className={`shrink-0 border-r border-[var(--border-color)] bg-[var(--bg-secondary)]/50 flex flex-col overflow-hidden ${sidebarCollapsed ? 'w-11' : 'w-72'} ${subAgentView || schedulerView ? 'opacity-50 pointer-events-none' : ''}`}
+          style={{ transition: 'width 200ms ease-out', willChange: 'width' }}
+        >
+          {/* Tab 栏 + collapse toggle */}
+          <div className="flex border-b border-[var(--border-color)]" style={{ minWidth: sidebarCollapsed ? 0 : '288px' }}>
+            {sidebarCollapsed ? (
+              /* 收起态：紧凑竖排 tab 按钮 */
+              <div className="flex flex-col w-full">
+                <button
+                  onClick={() => { setSidebarTab('topics'); setSidebarCollapsed(false); localStorage.setItem('picobot-sidebar-collapsed', 'false'); }}
+                  className={`py-2 text-xs font-medium text-center transition-colors ${
+                    sidebarTab === 'topics'
+                      ? 'text-[var(--accent-cyan)] bg-[var(--accent-cyan)]/10'
+                      : 'text-[var(--text-muted)] hover:text-[var(--text-secondary)] hover:bg-[var(--overlay-hover)]'
+                  }`}
+                  title="话题"
+                >
+                  话<br/>题
+                </button>
+                <button
+                  onClick={() => { setSidebarTab('scheduler'); setSidebarCollapsed(false); localStorage.setItem('picobot-sidebar-collapsed', 'false'); }}
+                  className={`py-2 text-xs font-medium text-center transition-colors ${
+                    sidebarTab === 'scheduler'
+                      ? 'text-[var(--accent-cyan)] bg-[var(--accent-cyan)]/10'
+                      : 'text-[var(--text-muted)] hover:text-[var(--text-secondary)] hover:bg-[var(--overlay-hover)]'
+                  }`}
+                  title="定时任务"
+                >
+                  定<br/>时
+                </button>
+                {/* 展开按钮 */}
+                <button
+                  onClick={toggleSidebar}
+                  className="flex items-center justify-center py-2 text-[var(--text-muted)] hover:text-[var(--accent-cyan)] hover:bg-[var(--overlay-hover)] transition-colors"
+                  title="展开侧栏"
+                >
+                  <PanelLeftOpen className="h-3.5 w-3.5" />
+                </button>
+              </div>
+            ) : (
+              <>
                 <button
                   onClick={() => setSidebarTab('topics')}
-              className={`flex-1 py-2.5 text-sm font-medium text-center transition-colors ${
+                  className={`flex-1 py-2.5 text-sm font-medium text-center transition-colors whitespace-nowrap ${
                     sidebarTab === 'topics'
                       ? 'text-[var(--accent-cyan)] border-b-2 border-[var(--accent-cyan)]'
                       : 'text-[var(--text-muted)] hover:text-[var(--text-secondary)]'
@@ -578,7 +633,7 @@ function App() {
                 </button>
                 <button
                   onClick={() => setSidebarTab('scheduler')}
-              className={`flex-1 py-2.5 text-sm font-medium text-center transition-colors ${
+                  className={`flex-1 py-2.5 text-sm font-medium text-center transition-colors whitespace-nowrap ${
                     sidebarTab === 'scheduler'
                       ? 'text-[var(--accent-cyan)] border-b-2 border-[var(--accent-cyan)]'
                       : 'text-[var(--text-muted)] hover:text-[var(--text-secondary)]'
@@ -586,10 +641,20 @@ function App() {
                 >
                   定时任务
                 </button>
+                {/* 收起按钮 */}
+                <button
+                  onClick={toggleSidebar}
+                  className="flex items-center justify-center px-2 text-[var(--text-muted)] hover:text-[var(--accent-cyan)] hover:bg-[var(--overlay-hover)] transition-colors shrink-0"
+                  title="收起侧栏"
+                >
+                  <PanelLeftClose className="h-4 w-4" />
+                </button>
+              </>
+            )}
           </div>
 
-          <div className="flex-1 overflow-hidden">
-            {sidebarTab === 'topics' ? (
+          <div className="flex-1 overflow-hidden" style={{ minWidth: sidebarCollapsed ? 0 : '288px' }}>
+            {sidebarCollapsed ? null : sidebarTab === 'topics' ? (
               <TopicList
                 sessionId={sessionId}
                 topics={topics}