App Navigation

Window and shell

PiNativeApp.swift creates one WindowGroup, injects a single AppModel, declares menu shortcuts, refreshes Git stats on activation, and stops every runtime on termination.
MainWindowView.swift uses a manual HStack, not NavigationSplitView: left sidebar, center region, and right pane.
Side panes animate width to zero instead of being removed, preserving state during collapse.
The center chat remains mounted while side panes open, close, or switch modes, preserving transcript scroll and view-local expansion state.
WindowChromeConfigurator.swift bridges into AppKit for hidden titlebar styling and custom leading/trailing titlebar controls.

selectedProjectID + selectedSessionID identify the selected conversation.
isRightPaneOpen and nullable rightPaneMode distinguish closed, picker-open, and selected-mode states.
Left visibility and pane widths persist; right-pane open state intentionally resets at launch.

ProjectSidebarView.swift routes New Chat, project rows, chat rows, pin/archive actions, promotion, and pending changes.
⌘N starts a projectless Quick Chat; ⌘1…⌘9 follows visible sidebar order.
Right-pane shortcuts open Pending Changes and Browser without replacing the selected conversation.
Settings and Promote to Project are sheets owned by MainWindowView.swift.