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/platform.js

@@ -0,0 +1,14 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+'use strict';
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.isWindows = void 0;
+if (typeof process === 'object') {
+    exports.isWindows = process.platform === 'win32';
+}
+else if (typeof navigator === 'object') {
+    let userAgent = navigator.userAgent;
+    exports.isWindows = userAgent.indexOf('Windows') >= 0;
+}