TUI: markdown links paint as `label (url)` instead of label-only OSC 8

Summary

When an assistant message contains a markdown link [label](https://example.com/path), OpenCode’s TUI correctly attaches an OSC 8 hyperlink, but still renders the URL in the clear as:

label (https://example.com/path)

Expected (terminals with OSC 8, e.g. Warp): visible text is only label, clickable via OSC 8. The href should not appear next to the label.

Environment

• OpenCode 1.18.23 (opencode-ai)
• Terminal: Warp (OSC 8 works — span is underlined/clickable)
• OS: Linux

Steps to reproduce

1. Have the agent (or paste as assistant content) output:

   See [codecrafters-io/build-your-own-x](https://github.com/codecrafters-io/build-your-own-x).
   

2. View the message in the TUI.

Actual

Visible: codecrafters-io/build-your-own-x (https://github.com/codecrafters-io/build-your-own-x)
OSC 8 covers the whole span (label + paren URL).

Expected

Visible: codecrafters-io/build-your-own-x only
OSC 8 target: https://github.com/codecrafters-io/build-your-own-x

Why it matters

Agents are instructed to use short labels (owner/repo, etc.) so tables and lists stay readable. Appending the full URL defeats that and breaks narrow layouts (tables especially).

Agents must not emit raw OSC 8 in chat (control chars are stripped/mangled). The only workable path is markdown links → TUI paint. So the TUI needs to conceal the href when OSC 8 is available.

Root cause (1.18.23)

Inline markdown renderer, case "link" (minified opencode.exe):

case "link": {
  let $ = { url: _.href };
  if (this._conceal) {
    for (let Z of _.tokens)
      this.renderInlineTokenWithStyle(Z, J, "markup.link.label", $);
    J.push(this.createChunk(" (", "markup.link", $));
    J.push(this.createChunk(_.href, "markup.link.url", $));
    J.push(this.createChunk(")", "markup.link", $));
  } else {
    // raw [label](href)
    ...
  }
}

• createChunk(..., { url: href }) correctly sets the OSC 8 link field.
• With _conceal default true (_contentDefaultOptions has conceal: !0), it still appends " (" + href + ")".

Related symbols: OSC8LinkProvider, _linkifyMarkdownChunks, conceal: !0.

Suggested fix

When conceal is on and hyperlinks are supported (OSC 8 / setHyperlinksCapability), render only the label tokens with { url: href }. Skip the " (", href, ")" chunks.

Optional fallback when OSC 8 is unavailable: keep today’s label (url) (or bare URL) so non-OSC terminals still show a usable target.

Out of scope / related

Not the same as wrap/click bugs:

• #14966 (closed) — OSC 8 missing on tree-sitter plain URLs
• #35649 — wrapped links not clickable (Kitty)
• #44442 — Ctrl+click with mouse capture

This issue is only about visible href duplication next to an already-linked label.