fix: 修复 VisionModelSwitch mermaid 图表渲染失败（转义特殊字符）

Author: tt-a1i

src/pages/StartHere.tsx

@@ -82,7 +82,7 @@ export function StartHere({ onNavigate }: StartHereProps) {
  <div className="mb-8">
  <p className="text-xs font-mono text-dim uppercase tracking-widest mb-4">Architecture Deep Dive</p>
  <h1 className="text-3xl md:text-4xl font-bold tracking-tight text-heading leading-tight">
- Gemini CLI<br />
+ AI Agent CLI<br />
  <span className="text-body font-normal">架构深度解析</span>
  </h1>
  </div>
@@ -128,7 +128,7 @@ export function StartHere({ onNavigate }: StartHereProps) {
  </div>
 
  <p className="text-sm text-dim border-t border-edge pt-4">
- 基于 Google Gemini CLI 源码分析，涵盖
+ 基于 AI Agent CLI 源码分析，涵盖
  <code>GeminiChat</code>、<code>Hook/Policy</code>、<code>Agent 框架</code>
  等事件驱动架构。
  </p>

src/pages/VisionModelSwitch.tsx

@@ -13,16 +13,16 @@ import { CodeBlock } from '../components/CodeBlock';
 
 export function VisionModelSwitch() {
  const multimodalFlow = `flowchart TD
- A[用户输入\n(文本 + @file/@dir 等)] --> B[解析为 PartListUnion]
- B --> C{Part 类型?}
- C -->|text| T[Part.text]
- C -->|inlineData| I[Part.inlineData\n(image/audio/pdf...)]
- C -->|fileData| F[Part.fileData\n(gs://... 等引用)]
- T --> D[contentGenerator.generateContentStream()]
+ A["用户输入<br/>(文本 + file/dir 引用)"] --> B["解析为 PartListUnion"]
+ B --> C{"Part 类型?"}
+ C -->|text| T["Part.text"]
+ C -->|inlineData| I["Part.inlineData<br/>(image/audio/pdf)"]
+ C -->|fileData| F["Part.fileData<br/>(gs:// 等引用)"]
+ T --> D["contentGenerator.generateContentStream()"]
  I --> D
  F --> D
- D --> E[Gemini API 返回流式 chunks]
- E --> G[Turn.run 归一为事件\nContent/Thought/ToolCallRequest/Finished]
+ D --> E["Gemini API 返回流式 chunks"]
+ E --> G["Turn.run 归一为事件<br/>Content/Thought/ToolCallRequest/Finished"]
 `;
 
  return (