[FEATURE]: Allow opencode background to match the terminal background

[preyam2002]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Title should explain it all, it will look better in my opinion. Hopefully an easy fix, I haven't looked at the code

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• [FEATURE]: Suggestion to set OpenCode TUI default background to transparent to match terminal themes. #14382: Nearly identical request — set TUI background to transparent to match terminal theme
• Add transparency/translucent background support for TUI #11866: Request for transparency/translucent background support for the TUI
• Use terminal theme colors by default #101: Request to use terminal theme colors by default so the TUI blends with the terminal

If your request is already covered by one of those, please add a thumbs-up reaction there instead so maintainers can gauge demand.

[preyam2002]

Closed as duplicated, PR not merged