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.

src/components/MainContent.astro

@@ -13,5 +13,6 @@ const { account, transactions } = Astro.props;
     <header class="main-header">
          <h1>Transactions for <span id="current-account-name">{account.name} (***{account.last4})</span></h1>
     </header>
-    <TransactionTable transactions={transactions} client:load /> {/* Make table updatable */}
+    /* Make table updatable */
+    <TransactionTable transactions={transactions} client:load /> {}
 </main>