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/utils.d.ts

@@ -0,0 +1,12 @@
+export declare class FileMap<T> extends Map<string, T> {
+    private caseSensitive;
+    private originalFileNames;
+    constructor(caseSensitive: boolean);
+    keys(): IterableIterator<string>;
+    get(key: string): T | undefined;
+    has(key: string): boolean;
+    set(key: string, value: T): this;
+    delete(key: string): boolean;
+    clear(): void;
+    normalizeId(id: string): string;
+}