feat: add initial frontend setup with styles, types, and testing framework

- Created a global CSS file for styling the frontend with responsive design.
- Introduced TypeScript types for various entities including Research, Alpha, and Account.
- Implemented Playwright tests for account management and data synchronization workflows.
- Configured TypeScript with strict settings and included necessary libraries.
- Set up Vite as the build tool with React plugin and API proxy configuration.
- Added a Python script to initialize environment variables securely.

frontend/playwright.config.ts

@@ -0,0 +1,30 @@
+import { defineConfig } from "@playwright/test";
+
+export default defineConfig({
+  testDir: "./tests",
+  fullyParallel: false,
+  workers: 1,
+  timeout: 60000,
+  use: {
+    actionTimeout: 10000,
+    baseURL: "http://127.0.0.1:5179",
+    viewport: { width: 1440, height: 1000 },
+    trace: "retain-on-failure",
+    screenshot: "only-on-failure",
+  },
+  webServer: [
+    {
+      command:
+        "cd ../backend && uv run uvicorn tests.browser_server:create_test_app --factory --host 127.0.0.1 --port 18000",
+      url: "http://127.0.0.1:18000/api/v1/health",
+      reuseExistingServer: false,
+      timeout: 30000,
+    },
+    {
+      command: "WQ_DEV_API=http://127.0.0.1:18000 pnpm dev --port 5179",
+      url: "http://127.0.0.1:5179",
+      reuseExistingServer: false,
+      timeout: 30000,
+    },
+  ],
+});