[Enhancement] Add One-Click 'Copy Code' Button to Output Blocks

🌟 Feature Request: Copy Code Button

Current Pain Point

When MonkeyCode generates code blocks in the chat response, it is difficult and tedious for users to copy them.

• Selection issues: Double-clicking or dragging to select large blocks of code is cumbersome, especially for long scripts.
• Scrolling: Navigating to copy text while the scrollbar moves is a bad UX.

Suggestion

Add a One-Click Copy Button (Icon) to the top-right corner of every code block.

• Icon: Use a standard clipboard icon (📋 or Copy).
• Feedback: Change icon to Check (✅) or tooltip "Copied!" briefly after clicking.

Why this matters

• Efficiency: Developers frequently copy-paste code to local editors or terminals to test. This is a high-frequency action.
• Standard Practice: Almost all modern AI coding tools (Cursor, GitHub Copilot, Claude) include this as a baseline feature.

Mockup Idea

+---------------------------------------+
| Python                               [📋 Copy] |
+---------------------------------------+
| import os                             |
| ...                                   |
+---------------------------------------+

No file or test is named; start by locating the chat response renderer for generated code blocks and inspect how their header and actions are built. Add a copy action with brief copied feedback, then verify it works for every output code block and does not alter the displayed code.