fix(local-replica): sanitize invalid windows chars in project folder name

[astarforbae]

Fixes #329

Summary

• sanitize invalid Windows folder-name characters when creating local replica folder from project
  title
• apply sanitization only on Windows (win32) to preserve existing behavior on other platforms

Validation

• manually verified in VS Code Extension Development Host
• confirmed local replica creation works for project titles containing : on Windows

[Copilot]

Pull request overview

This PR fixes issue #329 where users cannot create local replicas of Overleaf projects with invalid Windows filename characters (like colons) in their titles. The fix adds a sanitization function that replaces invalid characters with underscores, removes trailing dots/spaces, handles empty results, and avoids Windows reserved filenames (like "con", "aux", etc.), but only applies this sanitization on Windows to preserve existing behavior on other platforms.

Changes:

• Added a private static method sanitizeProjectFolderName() that sanitizes project names for Windows filesystem compatibility
• Modified validateBaseUri() to use the sanitized folder name instead of the raw project name when creating local replica directories
• Platform-specific handling ensures sanitization only occurs on Windows (win32 platform)

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