Voice mode: Space bar trigger doesn't work with full-width (Japanese IME) input mode

Description

When using voice mode, holding the Space bar to trigger recording only works in half-width (direct input / alphanumeric) mode. If the keyboard is in full-width mode (e.g., Japanese IME / Hiragana input), holding Space does not activate the voice recording.

Impact

This is a significant usability issue for non-English users (Japanese, Chinese, Korean, etc.) who frequently use IME and stay in full-width input mode. Having to manually switch to half-width mode every time before using push-to-talk adds unnecessary friction.

Expected behavior

Voice trigger should activate regardless of the current IME / input mode state.

Possible solutions

• Detect the raw physical key event rather than the character input
• Allow users to configure an alternative trigger key (e.g., a modifier key like Fn or a key combination)

Environment

• OS: macOS
• Input method: Japanese IME