Cropped the speech-bubble-with-sparkles mark from the new
WhispAssist logo/promo graphic (not the full graphic — text and
illustration detail don't read at 16-32px), color-keyed its background
to transparent, and regenerated the whole icon set via `tauri icon`
(title bar, taskbar, system tray, installer). Removed the iOS/Android/
Appx/macOS outputs tauri icon generates by default — this project only
targets Windows.
iamdoubz