Bug/accounting suggestion (#456)

* feat: add bike benefit handling and optional vacation accrual

- Introduced bike benefit (cykelförmån) with calculations for annual market value and monthly taxable value.
- Updated schemas to include new benefit types and validation rules.
- Implemented API routes for creating, updating, and deleting employee benefits.
- Enhanced salary calculation logic to accommodate new vacation rule options, including a 'none' option for no accrual.
- Added UI components for managing employee benefits, including input for bike benefit specifics.
- Created database migrations for employee benefits and updated salary line items to support new benefit types.

* chore: remove Langfuse env var checks

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* feat: enhance OAuth callback URL handling and update default scopes for Visma integration

* feat: remove trade_name field and simplify company naming in invoices

* refactor: destructure canWrite from useCanWrite for consistency across components

* feat: enhance PATCH endpoint to validate existing benefits and handle bike benefit updates

* feat: add missing label for bike benefit in salary line item types

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

lib/init.ts

@@ -24,11 +24,6 @@ const REQUIRED_EXTENSION_VARS = [
   'OPENAI_API_KEY',
 ] as const
 
-const OPTIONAL_VARS = [
-  'LANGFUSE_SECRET_KEY',
-  'LANGFUSE_PUBLIC_KEY',
-] as const
-
 function validateEnvironment(): void {
   // During builds (CI, Docker, Vercel), env vars may be absent or set to
   // placeholder sentinels. Skip validation so Next.js page collection
@@ -54,12 +49,6 @@ function validateEnvironment(): void {
   if (missingExt.length > 0) {
     log.warn(`Missing extension environment variables (extensions needing them may not work): ${missingExt.join(', ')}`)
   }
-
-  for (const v of OPTIONAL_VARS) {
-    if (!process.env[v]) {
-      log.warn(`Optional environment variable ${v} is not set`)
-    }
-  }
 }
 
 /**