Voice mode: holding spacebar inserts spaces instead of triggering recording on Linux

Description

Voice mode spacebar capture does not work on Linux. When voice mode is enabled (via /voice) and the spacebar is held, it just inserts spaces into the input instead of triggering audio recording.

Steps to reproduce

1. Start Claude Code on Linux
2. Run /voice to enable voice mode
3. Hold the spacebar

Expected: Recording starts
Actual: Spaces are inserted into the input field

Additional notes

• Tested both inside a bubblewrap sandbox and running claude directly — same behaviour in both cases
• voiceEnabled: true is set in ~/.claude/settings.json
• The issue appears to be that the spacebar key handler is not intercepting the keypress at all

Environment

• Claude Code version: 2.1.76
• OS: Linux (Ubuntu, kernel 6.8.0-101-generic)
• Shell: zsh
• TERM: xterm-256color