0455d1f8c6
Change Workspace.singlePaneScreen (single string) to singlePaneScreens (list of typeKey strings). First screen is the default. On workspace switch, loads the screen list into PinnedNavBarState and navigates to the first screen. - Add SinglePaneScreensEditor to workspace editor dialog - Add PinnedNavBarState.loadFromList() for workspace-driven nav - Backward compat: load old "singlePaneScreen" format as single-item list - Cmd+Shift+S captures current deck columns as singlePaneScreens Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>