openclaw - 💡(How to fix) Fix WebChat: render custom protocol links (obsidian://, things://, etc.) as clickable [2 pull requests]

Problem

The WebChat markdown renderer only linkifies http:// and https:// URLs. Custom protocol scheme links like obsidian://open?vault=...&file=... are rendered as plain text, even when wrapped in standard markdown link syntax ([text](obsidian://...)).

These URIs work fine when pasted into a browser address bar — the OS routes them to the registered app. But users can't click them in the WebChat UI.

Expected behavior

Markdown links with custom protocol schemes (e.g. obsidian://, things://, fantastical://, shortcuts://) should render as clickable <a> tags, the same way https:// links do.

Reproduction

1. In a WebChat conversation, have the assistant output: [Open in Obsidian](obsidian://open?vault=Personal%20Vault&file=Plans%2FTest)
2. The link is not clickable.

Notes

• Security consideration: an allowlist of known-safe schemes may be preferable to allowing arbitrary protocols.
• Candidate allowlist: obsidian, things, fantastical, shortcuts, craftdocs, notion, bear, ulysses, drafts, hook, x-apple-reminderkit, calshow.
• Alternatively, render any scheme used inside explicit markdown link syntax [text](scheme://...) — the user is already opting in by writing the link.