chore: update dependencies and add Cloudflare support

- Updated dependencies in package.json for Astro, React, and testing libraries.
- Added .assetsignore to exclude specific files from asset uploads.
- Refactored AccountSummary, MainContent, and Sidebar components for clarity and maintainability.
- Enhanced tsconfig.json to support React JSX syntax.
- Created wrangler.jsonc for Cloudflare Workers configuration.

astro.config.mjs

@@ -1,7 +1,13 @@
 // @ts-check
 import { defineConfig } from "astro/config";
 
+import cloudflare from "@astrojs/cloudflare";
+
+import react from "@astrojs/react";
+
 // https://astro.build/config
 export default defineConfig({
   output: "server",
-});
+  adapter: cloudflare(),
+  integrations: [react()],
+});