feat(KB-141): fix workspace type resolution and add clean-checkout typecheck tests

- Remove dist-dependent workspace type resolution from all tsconfig files

- Add clean-checkout typecheck regression test to CI suite

- Update package.json type definitions for core, engine, dashboard, and cli packages

- Update README with typecheck testing documentation

- Clean up unused test files and component dependencies

packages/dashboard/tsconfig.json

@@ -3,7 +3,8 @@
   "compilerOptions": {
     "outDir": "dist",
     "rootDir": "src",
-    "jsx": "react-jsx"
+    "jsx": "react-jsx",
+    "types": ["node", "vitest/globals", "@testing-library/jest-dom"]
   },
-  "include": ["src"]
+  "include": ["src/**/*"]
 }