Add SubtaskPart with metadata reference

Improvements

• CoreAdd global configuration support to app
• CoreGlobal configuration updates in app package
• CoreBump plugins
• TerminalAdd streaming prop to markdown element@remorses
• DesktopClose review pane when pressing escape key
• DesktopEnable ctrl+n and ctrl+p for popover navigation in desktop app@sairajchouhan
• DesktopAdd Thai locale support@natt-v
• DesktopAdd custom provider support to app
• CoreEnsure Copilot plugin properly sets headers for new messages API