style(ui): 优化界面颜色和文字样式

- 在App视图中取消撤销提示框的草稿状态
- 修改DropdownMenu标题颜色为#229ac3，增强视觉统一
- 精简McpStatusList的状态文本样式，去除加粗效果
- 将UndoSelector中的标题文字颜色改为#229ac3，提升界面一致性

Author: hqwlkj

src/ui/components/DropdownMenu/index.tsx

@@ -64,7 +64,7 @@ const DropdownMenu = React.memo(function DropdownMenu({
   maxVisible = 8,
   width,
   title,
-  titleColor = "magenta",
+  titleColor = "#229ac3",
   activeColor = "cyanBright",
   helpText,
   emptyText = "No items found",

src/ui/views/App.tsx

@@ -751,6 +751,7 @@ function App({ projectRoot, initialPrompt, onRestart }: AppProps): React.ReactEl
           targets={undoTargets}
           onSelect={(target, restoreMode) => void handleUndoRestore(target, restoreMode)}
           onCancel={() => {
+            setPromptDraft(null);
             setView("chat");
             setShowWelcome(true);
           }}

src/ui/views/McpStatusList.tsx

@@ -195,20 +195,10 @@ function ServerListView({
           </Text>
           <Box gap={1}>
             <Text dimColor>(</Text>
-            <Text color="green" bold>
-              {readyCount} ready,
-            </Text>
-            <Text color="yellow" bold>
-              {startingCount} starting,
-            </Text>
-            {reconnectingCount > 0 && (
-              <Text color="#ff9900" bold>
-                {reconnectingCount} reconnecting,
-              </Text>
-            )}
-            <Text color="red" bold>
-              {failedCount} failed
-            </Text>
+            <Text color="green">{readyCount} ready,</Text>
+            <Text color="yellow">{startingCount} starting,</Text>
+            {reconnectingCount > 0 && <Text color="#ff9900">{reconnectingCount} reconnecting,</Text>}
+            <Text color="red">{failedCount} failed</Text>
             <Text dimColor>)</Text>
           </Box>
         </Box>

src/ui/views/UndoSelector.tsx

@@ -99,7 +99,7 @@ export function UndoSelector({ targets, onSelect, onCancel }: Props): React.Reac
     >
       <Box flexDirection="column" borderStyle="round" borderDimColor flexGrow={1} overflow="hidden">
         <Box paddingX={1}>
-          <Text bold color="cyanBright">
+          <Text bold color="#229ac3">
             Undo
           </Text>
           <Text dimColor> restore to the point before a prompt</Text>