Update Next.js to version 15.4.2 and refactor invoice pages

- Upgrade Next.js and related packages for improved performance and security
- Refactor invoice-related pages to streamline navigation and enhance user experience
- Consolidate invoice editing and viewing functionality into a single page
- Remove deprecated edit page and implement a new view page for invoices
- Update links and routing for consistency across the dashboard

drizzle.config.ts

@@ -1,6 +1,6 @@
-import { type Config } from "drizzle-kit";
-
-import { env } from "~/env";
+import type { Config } from "drizzle-kit";
+// Use a relative import; path alias "~" may not resolve in CLI context
+import { env } from "./src/env.js";
 
 export default {
   schema: "./src/server/db/schema.ts",