Prevent missing characters in Sway transcription output

[none23]

Summary

Prevent Chromium and Electron applications from interpreting wtype's fourteenth generated keycode as Backspace when Local Wisper types a transcript into the focused window.

Changes

• Split transcripts only when another distinct character would receive the problematic keycode.
• Send each chunk through a fresh wtype process over standard input.
• Keep clipboard delivery unchanged and cover the reported phrase and split boundary.