Edit the live transcript while still recording, then paste when ready

[alanshurafa]

Handy sometimes gets technical terms and email addresses wrong, and right now I can only fix them after the text is pasted. With live preview on, I'd like to click into the overlay, fix a word while I keep talking, and paste only when I'm done.

How it works in my build (Windows):

• Click the live transcript in the recording overlay to edit it. Recording keeps going.
• My edits win over later recognition updates. If the model rewrites a part I changed, my version stays.
• Stop & review (or Ctrl+Enter) stops recording without pasting. Paste (or Ctrl+Enter again) sends it. Escape throws it away.
• If you never click the overlay, dictation works exactly as it does today.

It's Windows-only right now. macOS and Linux would need their own focus and paste handling.

Related: #2009 (direct request), #1916 (editing in the overlay after transcription), #1919 (streaming into the target app, a different approach).

Branch: https://github.com/alanshurafa/Handy/tree/codex/live-transcript-editor

Would this be useful to you? If you're on macOS or Linux and would want it there, say so.