VS Code extension: Markdown links with non-ASCII (Japanese) file paths are not clickable

In the Claude Code VS Code extension chat panel, markdown links with non-ASCII characters (e.g., Japanese) in the file path are not clickable, while links with ASCII-only paths work fine.

Steps to reproduce

1. Open Claude Code in VS Code extension
2. Have Claude reference a file with a Japanese path, e.g. [ACTION.md](1_actions/IN_TK_食品特化企画提案待ち/ACTION.md)
3. Try clicking the link

Expected

File opens in editor

Actual

Nothing happens (link is not clickable)

Working case

[CLAUDE.md](.claude/CLAUDE.md) (ASCII-only path) — works fine, file opens on click.

Additional testing

| Pattern | Non-ASCII in path | Result |
|---------|-------------------|--------|
| Relative path, ASCII only | No | Clickable |
| Relative path, Japanese | Yes | Not clickable |
| Absolute path, Japanese | Yes | Not clickable |
| Absolute path, ASCII only | No | Clickable |
| URL-encoded Japanese path | Yes (encoded) | Not clickable |

Note

The same markdown link format works correctly when written inside a .md file in the editor (Cmd+click opens the file). The issue is specific to the chat panel output.

Environment

• macOS (Darwin 25.2.0)
• VS Code extension (latest)