[FEATURE]: Copy assistant messages as rich text for pasting into Google Docs, Notion, etc. #10693

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Describe the enhancement you want to request

Problem

OpenCode renders markdown beautifully in the terminal - headers, code blocks, lists, and formatting all look great. But when I copy Claude's responses to paste into Google Docs, Notion, or other rich text editors, all that formatting is lost. I get plain text and have to manually reformat everything.

Proposed Solution

Add a setting copy_as_rich_text (default: false) that converts markdown to HTML when copying assistant messages. When enabled:

• Bold, italic, inline code, and links preserve their formatting
• Headers, bullet lists, and numbered lists maintain structure
• Code blocks become monospace <pre> blocks
• Tables stay as tables

The feature would gracefully fall back to plain text with a helpful warning toast if the system doesn't support rich text clipboard (e.g., missing wl-clipboard on Linux, or copying over SSH).

Use Cases

1. Documentation: Copy Claude's explanations directly into team docs without reformatting
2. Note-taking: Paste code snippets and instructions into Notion/Obsidian with formatting intact
3. Sharing: Quickly share formatted responses in emails or collaborative documents

Usage

Option 1: Toggle at runtime

Press Ctrl+P to open the command palette and select "Toggle copy as rich text". A toast confirms the current mode. This setting persists for the session.

Option 2: Set in config (permanent default)

{
  "tui": {
    "copy_as_rich_text": true,
  },
}

Platform Considerations

• macOS: AppleScript pasteboard (built-in)
• Linux Wayland: wl-copy --type text/html (requires wl-clipboard)
• Linux X11: xclip -t text/html (requires xclip)
• Windows: PowerShell clipboard API (built-in)
• SSH/tmux: Falls back to plain text with notification