fix(build): Add missing source path to jupyter-book build command

The build command was missing the target directory argument (.), causing it to fail to generate output. This lead to the copy step failing.

Author: ConstCorrectness

package.json

@@ -8,7 +8,7 @@
     "build": "tsc -b && vite build",
     "lint": "eslint . --ext ts,tsx --report-unused-disable-directives --max-warnings 0",
     "preview": "vite preview",
-    "build:book": "cd jupyter-books && uv run jupyter-book build",
+    "build:book": "cd jupyter-books && uv run jupyter-book build .",
     "copy:book": "shx mkdir -p public/notes && shx cp -r jupyter-books/_build/html/* public/notes/"
   },
   "dependencies": {