feature request: Add copy message content functionality to OpenCode web interface

[jhrudden]

The OpenCode web interface currently supports copying links to thread messages, but lacks the ability to copy the actual message content. While users can manually select content with Ctrl+C, this loses markdown formatting. This feature would preserve the original markdown when copying message text.

Proposed Enhancement:
When a user selects a message, automatically copy the message content to clipboard.

I'd be happy to implement this feature if there's interest from the maintainers.

[jayair]

Not sure if we'd want it on select but I can see adding a copy button or menu option for this.

What's the use case btw? What are you using the copied markdown for?

[jhrudden]

@jayair Didn't see your message till it was too late.

As for usecase: I want to be able to copy messages for docs and branching. When a conversation goes off track or gets too long, I like to branch off from a specific message and the terminal ux gets kinda cumbersome for longer conversations.

[jayair]

That looks pretty good. Yeah I'll review it and merge.