style: apply Biome formatting to TypeScript files (#27)

- Fix import sorting
- Standardize code formatting
- Apply consistent TypeScript style
- Update code to match Biome configuration

Part of #27

src/test/transactions.test.ts

@@ -7,13 +7,13 @@
 // - Add load testing for API endpoints
 // - Implement test data factories
 
-import { describe, it, expect } from 'vitest';
-import { POST as createTransaction } from '../pages/api/transactions/index';
-import {
-  PUT as updateTransaction,
-  DELETE as deleteTransaction,
-} from '../pages/api/transactions/[id]/index';
+import { describe, expect, it } from 'vitest';
 import { accounts, transactions } from '../data/store';
+import {
+  DELETE as deleteTransaction,
+  PUT as updateTransaction,
+} from '../pages/api/transactions/[id]/index';
+import { POST as createTransaction } from '../pages/api/transactions/index';
 import type { Transaction } from '../types';
 import { createMockAPIContext } from './setup';
 
@@ -273,7 +273,7 @@ describe('Transactions API', () => {
       const initialCount = transactions.length;
 
       const response = await deleteTransaction(
-        createMockAPIContext({ params: { id: '1' } }) as any
+        createMockAPIContext({ params: { id: '1' } }) as any,
       );
 
       expect(response.status).toBe(204);
@@ -292,7 +292,7 @@ describe('Transactions API', () => {
 
     it('should return 404 for non-existent transaction', async () => {
       const response = await deleteTransaction(
-        createMockAPIContext({ params: { id: '999' } }) as any
+        createMockAPIContext({ params: { id: '999' } }) as any,
       );
 
       const error = await response.json();
@@ -313,7 +313,7 @@ describe('Transactions API', () => {
       transactions.push(testTransaction);
 
       const response = await deleteTransaction(
-        createMockAPIContext({ params: { id: 'test-delete' } }) as any
+        createMockAPIContext({ params: { id: 'test-delete' } }) as any,
       );
 
       const error = await response.json();