Phase 1 MVP - Complete implementation

- Login with JWT and refresh token rotation
- Dashboard with projects cards
- ProjectView with TreeView navigation
- DocumentView with markdown editor and auto-save
- Tag management (create, assign, remove)
- Dark mode CSS variables
- Security fixes applied (logout to backend, createDocument endpoint)

node_modules/@babel/helper-string-parser/README.md

@@ -0,0 +1,19 @@
+# @babel/helper-string-parser
+
+> A utility package to parse strings
+
+See our website [@babel/helper-string-parser](https://babeljs.io/docs/babel-helper-string-parser) for more information.
+
+## Install
+
+Using npm:
+
+```sh
+npm install --save @babel/helper-string-parser
+```
+
+or using yarn:
+
+```sh
+yarn add @babel/helper-string-parser
+```