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/vscode-uri/lib/umd/index.d.ts

@@ -0,0 +1,3 @@
+import { URI } from './uri';
+import { Utils } from './utils';
+export { URI, Utils };