Electron derived userData from package.json's `@backspace/desktop` name, leaking
the monorepo's pnpm scope into ~/Library/Application Support/. Now `app.setName`
runs at module load before any userData consumer, and a one-shot migration
atomically moves the historical folder to <appData>/Backspace, cleaning the
empty @backspace/ parent. Conservative on conflict — never clobbers an existing
populated target. EXDEV fallback to recursive copy. Smoke-recovery path flipped
back to Backspace.
Jannis Braun
2b0f93ec62