fix(tui): support middle-click paste from X11 primary selection

[linuxhd0]

Issue for this PR

Closes #8915

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

It allows someone on Linux (Xorg, Wayland) to select text in one application and use the middle mouse button to paste into the prompt textbox without have to do ctrl-c + ctrl-v. This is common behaviour on Linux systems.

How did you verify your code works?

I ran bun dev after making the changes, selected some text in another terminal and pasted it into opencode and it worked. Without the fix, you don't get anything indication that anything at all happened in opencode.

I use Xorg, didn't try Wayland though.

Screenshots / recordings

N/A

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

If you do not follow this template your PR will be automatically rejected.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Potential Duplicate PRs Found

1. PR fix: enable primary clipboard copy for Wayland/X11 to fix Linux middle-click paste #6370: "fix: enable primary clipboard copy for Wayland/X11 to fix Linux middle-click paste"

   • fix: enable primary clipboard copy for Wayland/X11 to fix Linux middle-click paste #6370
   • Reason: Directly addresses the same Linux middle-click paste functionality with X11/Wayland support

2. PR feat(opencode): add linux clipboard toast warnings  #10332: "feat(opencode): add linux clipboard toast warnings"

   • feat(opencode): add linux clipboard toast warnings  #10332
   • Reason: Related to Linux clipboard handling and may have overlapping implementation

These PRs appear to be addressing the same or very similar issue regarding middle-click paste support on Linux systems.