fix: handle UnicodeEncodeError on Windows with gbk console encoding

[ThanhNguyxn]

Summary

Fixes #4765

On Windows with non-UTF8 console encodings (e.g., gbk for Chinese locale), Rich's console.print() can fail when printing Unicode characters like bullet points (• / U+2022) that aren't supported by the encoding.

Root Cause

The error occurs at mdstream.py line 207 when console.print(show) tries to output markdown content containing Unicode characters that can't be encoded with the console's encoding (gbk).

UnicodeEncodeError: 'gbk' codec can't encode character '\u2022' in position 1: illegal multibyte sequence

Fix

Added try/except around console.print() to catch UnicodeEncodeError and fall back to ASCII-safe text by replacing problematic characters with ?.

try:
    self.live.console.print(show)
except UnicodeEncodeError:
    safe_text = str(show).encode("ascii", errors="replace").decode("ascii")
    self.live.console.print(safe_text)

This ensures the application doesn't crash on Windows systems with non-UTF8 console encodings while still displaying readable output.

[e665107]

Hi ， When i start the aider, it will pull the new file, and have a replace? Today is ok now!