Caps Lock produces garbled characters in TUI input on WSL #16433

Description

When Caps Lock is enabled while typing in the OpenCode TUI input field on WSL, characters are replaced with unexpected symbols (e.g., @ characters). For example, typing "TESTING" with Caps Lock on produces @@T@esting instead of the expected uppercase text.

This seems to be related to how the TUI handles key events with the Caps Lock modifier on WSL terminals.

Plugins

No response

OpenCode version

1.2.20

Steps to reproduce

1. Run OpenCode inside WSL (Ubuntu)
2. Enable Caps Lock on the keyboard
3. Start typing in the input field
4. Observe that characters are replaced with @ or other unexpected symbols instead of uppercase letters****

Screenshot and/or share link

Operating System

WSL2 on Windows (Ubuntu)

Terminal

Windows Terminal