feat(agent-panel): 添加可调整宽度的agent面板

- 为 AgentPanel 组件添加拖拽调整宽度功能
- 引入 resize-handle 组件处理拖拽交互
- 设置面板宽度范围限制（280px-600px）

web/src/components/AgentChatComponent.vue

@@ -167,12 +167,18 @@
         <!-- Agent Panel Area -->
 
         <transition name="panel-slide">
-          <div class="agent-panel-wrapper" v-if="isAgentPanelOpen && hasAgentStateContent">
+          <div
+            class="agent-panel-wrapper"
+            v-if="isAgentPanelOpen && hasAgentStateContent"
+            :style="{ width: `${panelWidth}px` }"
+          >
             <AgentPanel
               :agent-state="currentAgentState"
               :thread-id="currentChatId"
+              :panel-width="panelWidth"
               @refresh="handleAgentStateRefresh"
               @close="toggleAgentPanel"
+              @resize="handlePanelResize"
             />
           </div>
         </transition>
@@ -257,6 +263,9 @@ const localUIState = reactive({
 
 // Agent Panel State
 const isAgentPanelOpen = ref(false)
+const panelWidth = ref(360)
+const minPanelWidth = 280
+const maxPanelWidth = 600
 
 // ==================== COMPUTED PROPERTIES ====================
 const currentAgentId = computed(() => {
@@ -973,6 +982,12 @@ const toggleAgentPanel = () => {
   isAgentPanelOpen.value = !isAgentPanelOpen.value
 }
 
+// 处理面板宽度调整
+// 反转 deltaX：向左拖动时让面板变宽（像拉出更多空间）
+const handlePanelResize = (deltaX) => {
+  panelWidth.value = Math.min(maxPanelWidth, Math.max(minPanelWidth, panelWidth.value - deltaX))
+}
+
 // ==================== HELPER FUNCTIONS ====================
 const getLastMessage = (conv) => {
   if (!conv?.messages?.length) return null
@@ -1153,7 +1168,7 @@ watch(
 }
 
 .agent-panel-wrapper {
-  flex: 3; /* 4:3 ratio with chat-main */
+  flex: 0 0 auto;
   height: calc(100% - 32px);
   overflow: hidden;
   z-index: 20;
@@ -1163,7 +1178,7 @@ watch(
   border-radius: 12px;
   box-shadow: 0 4px 20px var(--shadow-1);
   border: 1px solid var(--gray-200);
-  min-width: 0; /* Prevent flex item from overflowing */
+  min-width: 0;
 }
 
 /* Workbench transition animations */

web/src/components/AgentPanel.vue

@@ -1,5 +1,7 @@
 <template>
-  <div class="agent-panel">
+  <div class="agent-panel" :class="{ resizing: isResizing }">
+    <!-- 拖拽手柄 -->
+    <div class="resize-handle" @mousedown="startResize"></div>
     <div class="panel-header">
       <div class="panel-title">
         <FolderCode :size="16" class="header-icon" />
@@ -238,7 +240,7 @@ const props = defineProps({
   }
 })
 
-const emit = defineEmits(['refresh', 'close'])
+const emit = defineEmits(['refresh', 'close', 'resize'])
 
 const activeTab = ref('todos')
 const modalVisible = ref(false)
@@ -396,14 +398,68 @@ const handleFileChange = async (event) => {
 const emitRefresh = () => {
   emit('refresh')
 }
+
+// 拖拽调整宽度相关
+const isResizing = ref(false)
+const startX = ref(0)
+
+const startResize = (e) => {
+  isResizing.value = true
+  startX.value = e.clientX
+  document.body.style.cursor = 'col-resize'
+  document.body.style.userSelect = 'none'
+  // 添加全局事件监听
+  document.addEventListener('mousemove', onMouseMove)
+  document.addEventListener('mouseup', stopResize)
+}
+
+const onMouseMove = (e) => {
+  if (!isResizing.value) return
+  const deltaX = e.clientX - startX.value
+  startX.value = e.clientX
+  emit('resize', deltaX)
+}
+
+const stopResize = () => {
+  if (isResizing.value) {
+    isResizing.value = false
+    document.body.style.cursor = ''
+    document.body.style.userSelect = ''
+    document.removeEventListener('mousemove', onMouseMove)
+    document.removeEventListener('mouseup', stopResize)
+  }
+}
 </script>
 
 <style scoped lang="less">
+.resize-handle {
+  position: absolute;
+  left: -2px;
+  top: 50%;
+  transform: translateY(-50%);
+  height: 32px;
+  width: 4px;
+  cursor: col-resize;
+  background: var(--gray-300);
+  border-radius: 2px;
+  z-index: 10;
+  transition: background 0.2s;
+
+  &:hover {
+    background: var(--main-400);
+  }
+}
+
 .agent-panel {
   height: 100%;
   display: flex;
   flex-direction: column;
   background: var(--gray-0);
+  transition: none;
+
+  &.resizing {
+    transition: none;
+  }
 }
 
 .panel-header {
@@ -412,7 +468,7 @@ const emitRefresh = () => {
   justify-content: space-between;
   padding: 0 12px;
   height: 40px;
-  border-bottom: 1px solid var(--gray-200);
+  background: var(--gray-25);
   flex-shrink: 0;
 }
 
@@ -464,10 +520,11 @@ const emitRefresh = () => {
 
 .tabs {
   display: flex;
-  border-bottom: 1px solid var(--gray-100);
+  background: var(--gray-25);
   position: relative;
   align-items: center;
-  padding: 4px 6px;
+  padding: 8px 6px;
+  padding-top: 0px;
   gap: 4px;
   flex-shrink: 0;
 }
@@ -484,12 +541,12 @@ const emitRefresh = () => {
   border-radius: 999px;
 
   &:hover {
-    background: var(--gray-100);
+    background: var(--gray-150);
     color: var(--gray-900);
   }
 
   &.active {
-    background: var(--gray-100);
+    background: var(--gray-150);
     color: var(--gray-900);
   }
 }