style(vscode-ide-companion): update UI components and styling

- Updated chat message container spacing and styling
- Adjusted AssistantMessage text color handling
- Enhanced QwenMessageTimeline CSS rules for better visual flow
- Moved InfoBanner to ui directory for better organization
- Updated InputForm styling
- Added new CSS classes and updated tailwind configuration
- Improved timeline connection lines and message item spacing

These changes enhance the visual appearance and user experience of the chat interface.

packages/vscode-ide-companion/src/webview/App.tsx

@@ -32,7 +32,7 @@ import { EmptyState } from './components/ui/EmptyState.js';
 import type { PlanEntry } from './components/PlanDisplay.js';
 import { type CompletionItem } from './types/CompletionTypes.js';
 import { useCompletionTrigger } from './hooks/useCompletionTrigger.js';
-import { InfoBanner } from './components/InfoBanner.js';
+import { InfoBanner } from './components/ui/InfoBanner.js';
 import { ChatHeader } from './components/ui/layouts/ChatHeader.js';
 import {
   UserMessage,
@@ -487,7 +487,7 @@ export const App: React.FC = () => {
 
       <div
         ref={messagesContainerRef}
-        className="chat-messages flex-1 overflow-y-auto overflow-x-hidden pt-5 pr-5 pl-5 pb-[120px] flex flex-col relative min-w-0 focus:outline-none [&::-webkit-scrollbar]:w-2 [&::-webkit-scrollbar-track]:bg-transparent [&::-webkit-scrollbar-thumb]:bg-white/20 [&::-webkit-scrollbar-thumb]:rounded-sm [&::-webkit-scrollbar-thumb:hover]:bg-white/30 [&>*]:flex [&>*]:gap-0 [&>*]:items-start [&>*]:text-left [&>*]:py-2 [&>*:not(:last-child)]:pb-[10px] [&>.message-item]:px-0 [&>.message-item]:py-0 [&>*]:flex-col [&>*]:relative [&>*]:animate-[fadeIn_0.2s_ease-in]"
+        className="chat-messages flex-1 overflow-y-auto overflow-x-hidden pt-5 pr-5 pl-5 pb-[120px] flex flex-col relative min-w-0 focus:outline-none [&::-webkit-scrollbar]:w-2 [&::-webkit-scrollbar-track]:bg-transparent [&::-webkit-scrollbar-thumb]:bg-white/20 [&::-webkit-scrollbar-thumb]:rounded-sm [&::-webkit-scrollbar-thumb:hover]:bg-white/30 [&>*]:flex [&>*]:gap-0 [&>*]:items-start [&>*]:text-left [&>*]:py-2 [&>*:not(:last-child)]:pb-[8px] [&>*]:flex-col [&>*]:relative [&>*]:animate-[fadeIn_0.2s_ease-in]"
         style={{ backgroundColor: 'var(--app-primary-background)' }}
       >
         {!hasContent ? (

packages/vscode-ide-companion/src/webview/components/InputForm.tsx

@@ -201,6 +201,9 @@ export const InputForm: React.FC<InputFormProps> = ({
               </button>
             )}
 
+            {/* Spacer */}
+            <div className="flex-1 min-w-0" />
+
             {/* Thinking button */}
             <button
               type="button"

packages/vscode-ide-companion/src/webview/components/messages/AssistantMessage.tsx

@@ -66,11 +66,10 @@ export const AssistantMessage: React.FC<AssistantMessageProps> = ({
         paddingBottom: '8px',
       }}
     >
-      <span style={{ color: 'var(--app-secondary-foreground)', width: '100%' }}>
+      <span style={{ width: '100%' }}>
         <p
           style={{
             margin: 0,
-            color: 'var(--app-secondary-foreground)',
             width: '100%',
             wordWrap: 'break-word',
             overflowWrap: 'break-word',

packages/vscode-ide-companion/src/webview/components/messages/QwenMessageTimeline.css

@@ -8,7 +8,7 @@
  * 实现原理：
  * 1. 为所有AI消息项(qwen-message.message-item:not(.user-message-container))创建垂直连接线
  * 2. 当用户消息(user-message-container)隔断AI消息序列时，会自动重新开始一组新的时间线规则
- * 3. 每组AI消息序列的开始元素(top设为15px)，结束元素(bottom设为calc(100% - 15px))
+ * 3. 每组AI消息序列的开始元素(top设为15px)，结束元素(底部预留15px)
  */
 
 /* 默认的连接线样式 - 为所有AI消息项创建完整高度的连接线 */
@@ -25,13 +25,37 @@
 
 /* 处理每组AI消息序列的开始 - 包括整个消息列表的第一个AI消息和被用户消息隔断后的新AI消息 */
 .qwen-message.message-item:not(.user-message-container):first-child::after,
-.user-message-container + .qwen-message.message-item:not(.user-message-container)::after {
+.user-message-container + .qwen-message.message-item:not(.user-message-container)::after,
+/* 如果前一个兄弟不是 .qwen-message.message-item（例如等待提示、哨兵元素或卡片样式工具调用），也作为一组新开始 */
+.chat-messages > :not(.qwen-message.message-item)
+  + .qwen-message.message-item:not(.user-message-container)::after {
   top: 15px;
 }
 
 /* 处理每组AI消息序列的结尾 */
-.qwen-message.message-item:not(.user-message-container):last-child::after,
+/* 后一个兄弟是用户消息时 */
-.qwen-message.message-item:not(.user-message-container):has(+ .user-message-container)::after {
+.qwen-message.message-item:not(.user-message-container):has(+ .user-message-container)::after,
-  bottom: calc(100% - 15px);
+/* 或者后一个兄弟不是 .qwen-message.message-item（如等待提示、哨兵元素、卡片样式工具调用等）时 */
+.qwen-message.message-item:not(.user-message-container):has(+ :not(.qwen-message.message-item))::after,
+/* 真正是父容器最后一个子元素时 */
+.qwen-message.message-item:not(.user-message-container):last-child::after {
+  /* 注意：同时设置 top 和 bottom 时高度为 (容器高度 - top - bottom)。
+   * 这里期望“底部留 15px 间距”，因此 bottom 应为 15px（而不是 calc(100% - 15px)）。 */
   top: 0;
+  bottom: calc(100% - 15px);
+}
+
+.user-message-container:first-child {
+  margin-top: 0;
+}
+
+.message-item {
+  padding: 8px 0;
+  width: 100%;
+  align-items: flex-start;
+  padding-left: 30px;
+  user-select: text;
+  position: relative;
+  padding-top: 8px;
+  padding-bottom: 8px;
 }

packages/vscode-ide-companion/src/webview/components/messages/UserMessage.tsx

@@ -45,7 +45,7 @@ export const UserMessage: React.FC<UserMessageProps> = ({
 
   return (
     <div
-      className="qwen-message message-item user-message-container flex gap-0 items-start text-left flex-col relative animate-[fadeIn_0.2s_ease-in]"
+      className="qwen-message user-message-container flex gap-0 my-1 items-start text-left flex-col relative animate-[fadeIn_0.2s_ease-in]"
       style={{ position: 'relative' }}
     >
       <div

packages/vscode-ide-companion/src/webview/components/toolcalls/shared/SimpleTimeline.css

@@ -4,21 +4,19 @@
  * SPDX-License-Identifier: Apache-2.0
  *
  * Simplified timeline styles for tool calls and messages
- * Merged version of both SimpleTimeline.css files
+ * Only keeping actually used styles
  */
 
-/* Basic timeline container */
+/* ToolCallContainer timeline styles (from LayoutComponents.css) */
-.simple-toolcall-container,
+.toolcall-container {
-.simple-timeline-container {
   position: relative;
   padding-left: 30px;
   padding-top: 8px;
   padding-bottom: 8px;
 }
 
-/* Timeline connector - simple version */
+/* ToolCallContainer timeline connector */
-.simple-toolcall-container::after,
+.toolcall-container::after {
-.simple-timeline-container::after {
   content: '';
   position: absolute;
   left: 12px;
@@ -28,28 +26,45 @@
   background-color: var(--app-primary-border-color);
 }
 
-/* First item connector starts lower */
+/* First item: connector starts from status point position */
-.simple-toolcall-container:first-child::after,
+.toolcall-container:first-child::after {
-.simple-timeline-container:first-child::after {
   top: 24px;
 }
 
-/* Last item connector ends higher */
+/* Last item: connector shows only upper part */
-.simple-toolcall-container:last-child::after,
+.toolcall-container:last-child::after {
-.simple-timeline-container:last-child::after {
   height: calc(100% - 24px);
   top: 0;
   bottom: auto;
 }
 
-/* Bullet point */
+/* AssistantMessage timeline styles */
-.simple-toolcall-container::before,
+.assistant-message-container {
-.simple-timeline-container::before {
+  position: relative;
-  content: '\25cf';
+  padding-left: 30px;
-  position: absolute;
+  padding-top: 8px;
-  left: 8px;
+  padding-bottom: 8px;
-  padding-top: 2px;
+}
-  font-size: 10px;
+
-  color: var(--app-secondary-foreground);
+/* AssistantMessage timeline connector */
-  z-index: 2;
+.assistant-message-container::after {
+  content: '';
+  position: absolute;
+  left: 12px;
+  top: 0;
+  bottom: 0;
+  width: 1px;
+  background-color: var(--app-primary-border-color);
+}
+
+/* First item: connector starts from status point position */
+.assistant-message-container:first-child::after {
+  top: 24px;
+}
+
+/* Last item: connector shows only upper part */
+.assistant-message-container:last-child::after {
+  height: calc(100% - 24px);
+  top: 0;
+  bottom: auto;
 }

packages/vscode-ide-companion/src/webview/components/ui/InfoBanner.tsx

@@ -0,0 +1,107 @@
+/**
+ * @license
+ * Copyright 2025 Qwen Team
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import type React from 'react';
+import { TerminalIcon, CloseIcon } from '../icons/index.js';
+
+interface InfoBannerProps {
+  /**
+   * Whether the banner is visible
+   */
+  visible: boolean;
+
+  /**
+   * Callback when the banner is dismissed
+   */
+  onDismiss: () => void;
+
+  /**
+   * Optional: Custom message content (if not provided, uses default)
+   */
+  message?: React.ReactNode;
+
+  /**
+   * Optional: Custom link text
+   */
+  linkText?: string;
+
+  /**
+   * Optional: Callback when the link is clicked
+   */
+  onLinkClick?: (e: React.MouseEvent<HTMLAnchorElement>) => void;
+}
+
+export const InfoBanner: React.FC<InfoBannerProps> = ({
+  visible,
+  onDismiss,
+  message,
+  linkText = 'Switch back in Settings.',
+  onLinkClick,
+}) => {
+  if (!visible) {
+    return null;
+  }
+
+  return (
+    <div
+      className="flex items-center justify-between"
+      style={{
+        gap: '12px',
+        padding: '8px 16px',
+      }}
+    >
+      <div className="flex items-center flex-1 min-w-0" style={{ gap: '8px' }}>
+        {/* Icon */}
+        <TerminalIcon className="flex-shrink-0 w-4 h-4" />
+
+        {/* Message */}
+        <label
+          className="m-0 leading-snug text-[11px]"
+          style={{ color: 'var(--app-primary-foreground)' }}
+        >
+          {message || (
+            <>
+              Prefer the Terminal experience?{' '}
+              {onLinkClick && (
+                <a
+                  href="#"
+                  className="no-underline hover:underline cursor-pointer outline-none"
+                  style={{ color: 'var(--app-qwen-orange)' }}
+                  onClick={onLinkClick}
+                >
+                  {linkText}
+                </a>
+              )}
+            </>
+          )}
+        </label>
+      </div>
+
+      {/* Close button */}
+      <button
+        className="flex items-center justify-center cursor-pointer rounded"
+        style={{
+          background: 'none',
+          border: 'none',
+          padding: '6px',
+          color: 'var(--app-secondary-foreground)',
+          borderRadius: '4px',
+        }}
+        onMouseEnter={(e) => {
+          e.currentTarget.style.backgroundColor =
+            'var(--app-ghost-button-hover-background)';
+        }}
+        onMouseLeave={(e) => {
+          e.currentTarget.style.backgroundColor = 'transparent';
+        }}
+        aria-label="Close banner"
+        onClick={onDismiss}
+      >
+        <CloseIcon className="w-[10px] h-[10px]" />
+      </button>
+    </div>
+  );
+};

packages/vscode-ide-companion/src/webview/styles/ClaudeCodeStyles.css

@@ -10,8 +10,9 @@
 /* Import component styles */
 @import '../components/toolcalls/shared/DiffDisplay.css';
 @import '../components/messages/AssistantMessage.css';
-@import '../components/toolcalls/shared/MergedSimpleTimeline.css';
+@import '../components/toolcalls/shared/SimpleTimeline.css';
 @import '../components/messages/QwenMessageTimeline.css';
+@import '../components/MarkdownRenderer.css';
 
 
 /* ===========================

packages/vscode-ide-companion/src/webview/styles/tailwind.css

@@ -95,7 +95,8 @@
     color: var(--app-secondary-foreground);
   }
   .btn-text-compact--primary {
-    color: var(--app-primary-foreground);
+    color: var(--app-secondary-foreground);
+    /* color: var(--app-primary-foreground); */
   }
   .btn-text-compact:hover {
     background-color: var(--app-ghost-button-hover-background);

packages/vscode-ide-companion/tailwind.config.js

@@ -15,7 +15,6 @@ export default {
     './src/webview/components/toolcalls/**/*.{js,jsx,ts,tsx}',
     './src/webview/components/InProgressToolCall.tsx',
     './src/webview/components/MessageContent.tsx',
-    './src/webview/components/InfoBanner.tsx',
     './src/webview/components/InputForm.tsx',
     './src/webview/components/PermissionDrawer.tsx',
     './src/webview/components/PlanDisplay.tsx',