Voice dictation in VSCode extension frequently mis-transcribes speech

Environment

• Extension: anthropic.claude-code v2.1.217
• VSCode: 1.129.1
• OS: Linux Mint 22.3

Issue
When using the microphone/dictation button in the Claude Code VSCode extension to speak input instead of typing, the transcribed text frequently comes out wrong / different from what was actually said. This forces falling back to typing manually, defeating the purpose of the dictation feature.

Expected behavior
Dictated speech should be transcribed accurately, or at minimum close enough to be usable without heavy manual correction.

Notes
No OS-level mic issue identified (input device/levels appear normal in system sound settings) — the problem seems specific to the extension's dictation feature itself.