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.

wrangler.jsonc

@@ -0,0 +1,9 @@
+{
+  "$schema": "node_modules/wrangler/config-schema.json",
+  "name": "finance-tracker",
+  // Update to today's date
+  "compatibility_date": "2025-04-24",
+  "assets": {
+    "directory": "./dist"
+  }
+}