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/components/chat/DyadTokenSavings.tsx

@@ -0,0 +1,36 @@
+import React from "react";
+import { Zap } from "lucide-react";
+import { Tooltip, TooltipTrigger, TooltipContent } from "../ui/tooltip";
+
+interface DyadTokenSavingsProps {
+  originalTokens: number;
+  smartContextTokens: number;
+}
+
+export const DyadTokenSavings: React.FC<DyadTokenSavingsProps> = ({
+  originalTokens,
+  smartContextTokens,
+}) => {
+  const tokensSaved = originalTokens - smartContextTokens;
+  const percentageSaved = Math.round((tokensSaved / originalTokens) * 100);
+
+  return (
+    <Tooltip>
+      <TooltipTrigger asChild>
+        <div className="bg-green-50 dark:bg-green-950 hover:bg-green-100 dark:hover:bg-green-900 rounded-lg px-4 py-2 border border-green-200 dark:border-green-800 my-2 cursor-pointer">
+          <div className="flex items-center gap-2 text-green-700 dark:text-green-300">
+            <Zap size={16} className="text-green-600 dark:text-green-400" />
+            <span className="text-xs font-medium">
+              Saved {percentageSaved}% of codebase tokens with Smart Context
+            </span>
+          </div>
+        </div>
+      </TooltipTrigger>
+      <TooltipContent side="top" align="center">
+        <div className="text-left">
+          Saved {Math.round(tokensSaved).toLocaleString()} tokens
+        </div>
+      </TooltipContent>
+    </Tooltip>
+  );
+};