feat(FN-2269): migrate dashboard session selection to global settings

- Add global settings schema/types fields for persisted dashboard session state (selected project and node)
- Refactor NodeContext and current-project hooks to read/write project and node selection via global settings instead of project-local state
- Update App wiring to use the new selection flow across dashboard startup and switching behavior
- Add and expand dashboard tests for NodeContext, useCurrentProject, and view-state persistence behavior

packages/core/src/settings-schema.ts

@@ -47,6 +47,9 @@ export const DEFAULT_GLOBAL_SETTINGS = {
   settingsSyncAuth: false,
   settingsSyncInterval: 900000,
   settingsSyncConflictResolution: "last-write-wins",
+  // Dashboard session state (persisted to global settings for PWA/offline restore)
+  dashboardCurrentNodeId: undefined,
+  dashboardCurrentProjectIdByNode: undefined,
 } satisfies CompleteSettings<GlobalSettings>;
 
 /** Default values for project-level settings. */