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

src/server/db/index.ts

@@ -16,7 +16,10 @@ export const pool =
   globalForDb.pool ??
   new Pool({
     connectionString: env.DATABASE_URL,
-    ssl: env.NODE_ENV === "production" ? { rejectUnauthorized: false } : false,
+    ssl:
+      env.NODE_ENV === "production" && !env.DB_DISABLE_SSL
+        ? { rejectUnauthorized: false }
+        : false,
     max: 20,
     idleTimeoutMillis: 30000,
   });