WebSearch source links are not clickable in terminal

When using WebSearch, Claude Code includes a "Sources:" section with markdown hyperlinks like [Title](URL). In the terminal, these render as colored/underlined text but are not clickable or selectable as URLs.

Expected behavior: URLs from search results should be displayed in a way that's usable in a terminal — either as plain URLs that terminal emulators can detect and make clickable, or using OSC 8 hyperlink escape sequences.

Current behavior: Sources render as [Title](URL) markdown which gets styled but the URL itself is hidden inside the markdown syntax, making it impossible to open or copy.

Reproduction:

1. Ask Claude Code a question that triggers a web search
2. Observe the "Sources:" section at the end of the response
3. Try to click or copy any source URL