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/@vue/devtools-api/lib/esm/api/util.d.ts

@@ -0,0 +1,4 @@
+export type ID = number | string;
+export interface WithId {
+    id: ID;
+}