Fix most segfaults on Windows with Bun v1.3.10 stable

Improvements

• CoreSplit TUI and server configuration
• DesktopRemove interactive shell flag from sidecar spawn to prevent hang on macOS@kilhyeonjun
• DesktopFixed permissions and questions handling from child sessions in the app
• DesktopFixed keyboard navigation for previous/next message@neriousy
• DesktopCorrect Copilot provider description in i18n files@Oleksii-Pavliuk