System Prompt Customization for Personalization & Select and Copy

Feature Description

Add a /personalization (or /persona) command where it's a input box for a custom instructions for the model you use. Could be Project or Global personalization. For example you could ask it to add some emojis or a header so that the AI's response would be more reactive, or to never use an explanation inside the code the AI is writing

And then in OpenCode, when you select a text, it automatically gets copied to your clipboard, works for Linux/MacOS and Windows. Or Claude Code-like, you could select the text and Ctrl+Shift+C to copy.

Use Case

This would be beneficial because, especially for younger developers including me, they do not like bland AI responses, like a cold, emojiless response. And would like the copy mechanism as it is useful to share plans or something else without sharing the whole entire chat.

Additional Context

No response

How important is this to you?

Nice to have

The issue names no files, tests, or entry points. First map the command-handling and terminal interfaces involved, then clarify whether personalization and copy behavior are separate deliverables; done should define project/global scope and expected behavior across Linux, macOS, and Windows.