fix: open Windows file links in chat

[thiscallnet]

Summary

Make chat file links in Windows native app clickable
Clicking opens sidebar with the file
Adds a relevant file icon too

Why

Chat file links in Windows native apps look clickable, act clickable, but arent, its confusing, would be nice to add clickable behavior

Validation

Have AI reply to you with file links in chat on Windows app:

Before:

After ( clickable, opens sidebar with file ):

---

Note

Low Risk
Localized markdown link normalization and sanitize allowlist for chat rendering; no auth or server changes, with added unit tests.

Overview
Windows drive-letter paths in chat markdown (e.g. C:/Users/... or file:///D:/...) now survive sanitization and are normalized so the existing file-link UI can treat them as workspace files instead of broken or external links.

rehype-sanitize is extended so single-letter href protocols are allowed before urlTransform runs—otherwise C: is stripped as an unknown scheme. rewriteMarkdownFileUriHref then canonicalizes backslashes, encoded %5C, and duplicate slashes to a leading-slash form like /C:/path, which keeps the drive letter from being parsed as a URL scheme downstream.

Tests cover file:// Windows URIs, angle-bracketed destinations, and several slash/encoding variants; non-file hrefs like https:// and x:command stay unchanged.

^{Reviewed by Cursor Bugbot for commit 76625da. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

[!NOTE]

Fix Windows drive letter file links opening in chat

• Extends the rehype-sanitize schema in ChatMarkdown.tsx to allow Windows drive-letter pseudo-protocols (e.g. C:) so they are not stripped before urlTransform runs.
• Updates rewriteMarkdownFileUriHref in markdown-links.ts to canonicalize Windows drive-style hrefs (including backslash, URL-encoded backslash, and duplicate-slash variants) to a leading-slash form like /C:/path.
• Adds tests in markdown-links.test.ts covering normalization of file:// URIs, angle-bracketed paths, and various slash/encoding variants.

^{Macroscope summarized 76625da.}

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[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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[macroscopeapp]

Approvability

Verdict: Approved e1752e5

Straightforward bug fix for Windows file path handling in chat markdown. Changes are self-contained to link processing logic, include comprehensive test coverage, and have no security or infrastructure implications.

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