Incorrect parsing of Unicode smart quotes from `.docx` files

Bug: Incorrect parsing of Unicode smart quotes from .docx files

When using MarkItDown to convert .docx files created by Microsoft Word (default settings, smart quotes enabled), Unicode characters such as:

• Apostrophes (’ U+2019)
• Left double quotes (“ U+201C)
• Right double quotes (” U+201D)

are incorrectly parsed and appear in the Markdown output as corrupted characters like Æ, ô, ö.

Steps to Reproduce:

1. Create a new .docx in Word with smart quotes enabled (default setting).
2. Add text such as: It’s important to “quote” text properly.
3. Run MarkItDown to convert the .docx to .md.
4. Observe corrupted characters in the output.

Expected Behavior:
Smart punctuation should either:

• Be preserved correctly as Unicode characters, or
• Be flattened gracefully to ASCII equivalents (' and ").

Actual Behavior:
Corrupted non-ASCII characters appear in Markdown.

Workarounds:

• Disabling smart quotes in Word avoids the issue.
• Alternative tools like Pandoc handle .docx smart punctuation correctly.

Environment:

• MarkItDown version: 0.1.1
• Python version: 3.12
• OS: Windows 11

Reproduce the issue with a Microsoft Word .docx containing the listed smart punctuation, then trace the MarkItDown .docx conversion entry point and its text decoding path. Done means the Markdown output preserves the Unicode characters or converts them cleanly to ASCII equivalents without corrupted characters.