L54: DownloadBar preview image now tracks failed src in state (same pattern as
MediaThumb); on load error shows the kind icon fallback instead of broken img.
L61: Convert taskbarProgress from ipcMain.on/ipcRenderer.send to ipcMain.handle/
ipcRenderer.invoke so all IPC channels use the same request-response idiom.
App.tsx calls void to explicitly discard the resolved promise.
L63: audioQuality() now has an explicit 'Best' case alongside the bitrate strings;
unknown labels still fall back to '0' but the default branch is documented.
typecheck + 242 tests + eslint + prettier green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
debont80
ba208de98b