add price history routes and implement modal hook; enhance MainLayout tests with default mock values

vitest.config.integration.ts

@@ -3,6 +3,9 @@ import { defineConfig, mergeConfig } from 'vitest/config';
 import type { UserConfig } from 'vite';
 import viteConfig from './vite.config';
 
+// Ensure NODE_ENV is set to 'test' for all Vitest runs.
+process.env.NODE_ENV = 'test';
+
 // 1. Separate the 'test' config (which has Unit Test settings) 
 //    from the rest of the general Vite config (plugins, aliases, etc.)
 // DEBUG: Use console.error to ensure logs appear in CI/CD output