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/@volar/language-core/lib/linkedCodeMap.d.ts

@@ -0,0 +1,4 @@
+import { SourceMap } from '@volar/source-map';
+export declare class LinkedCodeMap extends SourceMap<any> {
+    getLinkedOffsets(start: number): Generator<number, void, unknown>;
+}