feat: add project-aware agent workspace

src/shared/ui/reading-workspace-context.ts

@@ -0,0 +1,13 @@
+import { createContext, useContext } from "react";
+
+export type ReadingDocument = { id: string; title: string; host: HTMLDivElement };
+export type ReadingWorkspace = {
+  active: ReadingDocument | null;
+  view: "focus" | "map_split" | "map_only";
+  open: (document: ReadingDocument) => void;
+  close: (id?: string) => void;
+  setView: (view: ReadingWorkspace["view"]) => void;
+};
+export const ReadingWorkspaceContext = createContext<ReadingWorkspace | null>(null);
+
+export const useReadingWorkspace = () => useContext(ReadingWorkspaceContext);