fix: macOS cmd+v image paste in TUI

[hernandezsanti]

Summary

On macOS, pasting images into the TUI prompt with cmd+v does not work reliably.

Repro

• Platform: macOS
• Terminals tested:
  • Ghostty
  • iTerm2
  • Terminal.app

Steps:

1. Copy an image to the clipboard
2. Focus the OpenCode TUI prompt
3. Press cmd+v

Expected

The image should attach to the prompt.

Actual

cmd+v does not consistently attach the image. In my testing, behavior differs by terminal.

Notes

I have a local prototype that improves cmd+v image paste handling on macOS.

[github-actions]

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

• Regression: Ctrl+V image paste into chatbox no longer works (TUI) #13322: Regression: Ctrl+V image paste into chatbox no longer works (TUI) — same core symptom (clipboard image paste broken in TUI)
• fix(tui): Ctrl+V image paste fails with Russian input source on macOS #7556: Ctrl+V image paste fails with Russian input source on macOS — same platform and feature
• Feature request: Paste to attach image #906: Feature request: Paste to attach image — overlapping scope
• In Memory Image can't be Pasted in Opencode After TUI Upgrade. #4077: In Memory Image can't be Pasted in Opencode After TUI Upgrade — related image paste failure

Please review these issues before continuing, and consider whether your report adds new information not already covered.

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For keybind-related issues, please also check our pinned keybinds documentation: #4997