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/Sidebar.astro

@@ -1,11 +1,12 @@
 ---
 import AddTransactionForm from './AddTransactionForm.astro';
 import AccountSummary from './AccountSummary.astro';
-import type { Account } from '../types'; // We'll define this type
+import type { Account } from '../types';
 
 interface Props {
     accounts: Account[];
-    initialAccount: Account; // Pass the initially selected account
+    /* The account to show in the sidebar. */
+    initialAccount: Account;
 }
 
 const { accounts, initialAccount } = Astro.props;
@@ -25,8 +26,9 @@ const { accounts, initialAccount } = Astro.props;
         </select>
     </nav>
 
-    <AccountSummary account={initialAccount} client:load /> {/* Make summary updatable */}
+    <AccountSummary account={initialAccount} /> {}
 
-    <AddTransactionForm client:load /> {/* Make form toggle interactive */}
+    /* Make form toggle interactive */
+    <AddTransactionForm client:load /> {}
 
 </aside>