[Feature Request] Add a button to copy the snippet code

# 🐛 Problem / Context
When viewing code snippets in a list, it’s sometimes difficult to copy only the intended snippet.
Users often end up selecting extra rows or unrelated text, which slows things down and causes mistakes.

# 🎯 Goal
Make copying code snippets quick, precise, and frustration-free.

# ✅ Done When
Each row that contains a code snippet includes a “Copy” button
Clicking the button copies only the code snippet, nothing else
The action works consistently across all rows where code snippets are displayed

# 💡 Notes (Optional)
The button should be clearly visible but not visually distracting
Bonus points for user feedback (e.g. tooltip or toast: “Copied!”)

首先定位渲染代码片段列表的 view 或 component，并检查该列表的测试方式。跟踪每一行可用的 snippet 值，然后确认每一行都有一个可见的 Copy 操作，该操作只复制该行的 snippet，并在已实现的情况下提供所要求的反馈。

由索引模型根据 Issue 内容生成。