fix: flush stdout after queue_description to display tool information

[yayami3]

Description

Fixes #3155 - Tool descriptions (e.g., file paths) were not displayed in permission prompts.

Problem

When Q requests permission to use a tool, the tool description was not visible to users:

Before:

🛠️  Using tool: fs_read
 ⋮ 
 ● 
Allow this action? [y/n/t]:

After:

🛠️  Using tool: fs_read
 ⋮ 
 ● Reading file: /tmp/foo.txt, all lines
Allow this action? [y/n/t]:

Root Cause

The queue! macro buffers output and requires an explicit flush() to display content. The print_tool_description() method was missing a flush() call after queue_description().

Changes

• Added self.stdout.flush()? in print_tool_description() method
• File: crates/chat-cli/src/cli/chat/mod.rs
• Lines: +2

Checklist

• Code follows the project's style guidelines
• Changes have been tested locally
• No breaking changes introduced