refactor(ui): 优化主题管理和界面相关代码

- 移除 ExitSummaryView 中对宽度的传参，简化组件接口
- 在颜色淡化函数中添加非 hex 色值直接返回的处理，避免错误
- 修改 inlineCode 颜色为更合适的透明紫色
- 修正 markdown 代码块渲染，使用正确的颜色函数
- 精简 slash-commands 中 /new 命令描述文本
- 重构 ThemeManager 中的 revertTheme 方法，改用加载主题设置并解析对比度后应用新主题

Author: hqwlkj

src/ui/components/MessageView/markdown.ts

@@ -39,7 +39,7 @@ export function renderMarkdownSegments(text: string, maxWidth?: number): Markdow
   for (const seg of fenceSegments) {
     if (seg.kind === "code") {
       const langTag = seg.lang ? tc.dim(`[${seg.lang}]`) + "\n" : "";
-      segments.push({ kind: "code", body: langTag + tc.dim(seg.body), lang: seg.lang });
+      segments.push({ kind: "code", body: langTag + tc.code(seg.body), lang: seg.lang });
       continue;
     }
     const blocks = splitTableBlocks(seg.body);

src/ui/core/slash-commands.ts

@@ -46,7 +46,7 @@ export const BUILTIN_SLASH_COMMANDS: SlashCommandItem[] = [
     kind: "new",
     name: "new",
     label: "/new",
-    description: "Start a new session with empty context; previous session stays on disk (resumable with /resume)",
+    description: "Start a new session (previous session resumable with /resume)",
   },
   {
     kind: "init",

src/ui/theme/ThemeManager.ts

@@ -115,8 +115,9 @@ export class ThemeManager {
    */
   revertTheme(): void {
     this.currentPreset = this.loadPresetFromSettings();
-    const savedSettings = resolveCurrentSettings(this.projectRoot);
-    this.applyTheme(savedSettings.theme, this.currentPreset);
+    const themeSettings = this.loadThemeSettings();
+    const newTheme = this.resolveWithContrast(themeSettings);
+    this.applyTheme(newTheme, this.currentPreset);
   }
 
   /**

src/ui/theme/colors-theme.ts

@@ -42,9 +42,13 @@ export interface ColorsTheme {
 
 /**
  * 将 hex 颜色淡化（混合灰色）。
+ * 对非 hex 命名色（如 ANSI 的 "white"、"black"）返回原色，不做淡化。
  */
 function dimHex(hex: string, ratio: number): string {
-  const h = hex.replace("#", "");
+  if (!hex.startsWith("#")) {
+    return hex;
+  }
+  const h = hex.slice(1);
   const r = parseInt(h.slice(0, 2), 16);
   const g = parseInt(h.slice(2, 4), 16);
   const b = parseInt(h.slice(4, 6), 16);
@@ -143,7 +147,7 @@ export function buildThemeTokens(
       hover: c.LightBlue,
     },
     inlineCode: {
-      foreground: c.AccentBlue,
+      foreground: `${c.AccentPurple}cc`,
       background: dimHex(c.Background, 0.08),
       border: dimHex(fg, 0.7),
     },

src/ui/views/App.tsx

@@ -795,7 +795,7 @@ function App({ projectRoot, initialPrompt, onRestart }: AppProps): React.ReactEl
           onCancel={handlePermissionCancel}
         />
       ) : isExiting ? (
-        <ExitSummaryView session={exitSession} width={screenWidth} />
+        <ExitSummaryView session={exitSession} />
       ) : (
         <PromptInput
           projectRoot={projectRoot}

src/ui/views/ExitSummaryView.tsx

@@ -7,7 +7,6 @@ import { buildExitSummaryData } from "../exit-summary";
 
 type Props = {
   session: SessionEntry | null;
-  width: number;
 };
 
 function formatNumber(n: number): string {