Voice mode: noise detection works but STT transcription never fires

Description

Voice mode (/voice) detects microphone input — the new visual noise-detection bar animates correctly — but speech-to-text transcription never produces any output. The spoken audio is captured (visual cue confirms it) but no text appears after releasing Space.

Additionally, Space sometimes inserts literal space characters into the input instead of being fully consumed by push-to-talk.

Environment

• Claude Code version: 2.1.83
• OS: Windows 11 Home 25H2 (Build 26200)
• Machine: Alienware m18 R2, i9-14900HX, 64GB RAM
• Interface: Claude Code desktop app (Windows)

Steps to Reproduce

1. Run /voice to enable voice mode
2. Hold Space to record — noise detection bar animates, confirming mic input
3. Release Space
4. No transcription text appears
5. Space key sometimes inserts a space character instead of being consumed

Expected Behavior

Speech should be transcribed to text after releasing Space.

Actual Behavior

• Noise detection bar works (mic input is captured)
• No transcription output
• Space key occasionally leaks through as a literal character