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/entities/decode.js

@@ -0,0 +1,3 @@
+// Make exports work in Node < 12
+// eslint-disable-next-line no-undef, unicorn/prefer-module
+module.exports = require("./dist/commonjs/decode.js");