feat(tui): clickable hyperlinks via OSC 8#530
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Detect URLs in rendered chat buffer and emit OSC 8 open/close sequences directly to stdout after ratatui frame render. Markdown links are parsed via pulldown-cmark Tag::Link and styled with underline. Bare URLs are detected post-render via regex scan of the buffer contents. OSC 8 sequences are written via crossterm cursor positioning after draw, avoiding ratatui buffer corruption. Terminals without OSC 8 support silently ignore the sequences. Closes #518
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Summary
Tag::Linkwith underline+cyan stylinghttps?://URLs via regex post-renderFiles
crates/zeph-tui/src/hyperlink.rs(new) — URL regex,HyperlinkSpan,inject_osc8()crates/zeph-tui/src/widgets/chat.rs—MdRendererLink handling, buffer scan + injectioncrates/zeph-tui/src/theme.rs—linkstyle (Cyan, underlined)Test plan
cargo build --features tuicargo clippy --features tui -- -D warnings— zero warningscargo nextest run -p zeph-tui— 111 tests passCloses #518