TUI crashes when typing bare '/' and pressing Enter #33867

Description

Typing a bare / (just the slash character) and pressing Enter in the TUI prompt causes a fatal crash. The TUI disappears.

This affects any case where the input is a standalone / with no following text. The command parser likely attempts to process an empty command name "", hitting an unhandled null/undefined reference.

Steps to reproduce

1. Open OpenCode TUI
2. Type / (single slash character only)
3. Press Enter
4. TUI crashes immediately

Expected behavior

• Bare / should be treated as literal text input, or
• The command parser should gracefully handle empty command names (e.g., show "No matching command" or ignore), instead of crashing

Related issues

• TUI blocks path input starting with / due to command matching #11965 — TUI blocks path input starting with / due to command matching
• Single-token slash commands are swallowed when no local TUI slash matches #25932 — Single-token slash commands are swallowed when no local TUI slash matches

Environment

• OpenCode version: 1.17.10
• OS: Windows
• Terminal: Windows Terminal (PowerShell 5.1)
• Plugins: oh-my-openagent@latest, opencode-supermemory@latest, opencode-subagent-statusline@latest