feat(fake-llm-server): add initial setup for fake LLM server with TypeScript and Express

- Created package.json for dependencies and scripts
- Added tsconfig.json for TypeScript configuration
- Implemented fake stdio MCP server with basic calculator and environment variable printing tools
- Added shell script to run the fake stdio MCP server
- Updated root tsconfig.json for project references and path mapping

backups/backup-20251218-161645/src/atoms/chatAtoms.ts

@@ -0,0 +1,24 @@
+import type { FileAttachment, Message } from "@/ipc/ipc_types";
+import { atom } from "jotai";
+import type { ChatSummary } from "@/lib/schemas";
+
+// Per-chat atoms implemented with maps keyed by chatId
+export const chatMessagesByIdAtom = atom<Map<number, Message[]>>(new Map());
+export const chatErrorByIdAtom = atom<Map<number, string | null>>(new Map());
+
+// Atom to hold the currently selected chat ID
+export const selectedChatIdAtom = atom<number | null>(null);
+
+export const isStreamingByIdAtom = atom<Map<number, boolean>>(new Map());
+export const chatInputValueAtom = atom<string>("");
+export const homeChatInputValueAtom = atom<string>("");
+
+// Atoms for chat list management
+export const chatsAtom = atom<ChatSummary[]>([]);
+export const chatsLoadingAtom = atom<boolean>(false);
+
+// Used for scrolling to the bottom of the chat messages (per chat)
+export const chatStreamCountByIdAtom = atom<Map<number, number>>(new Map());
+export const recentStreamChatIdsAtom = atom<Set<number>>(new Set<number>());
+
+export const attachmentsAtom = atom<FileAttachment[]>([]);