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/email/invoice-templates.ts

@@ -137,7 +137,6 @@ export function generateInvoiceEmailHtml(data: InvoiceEmailData): string {
       <p style="margin: 0; color: #666; font-size: 14px;">
         Med vänliga hälsningar,<br>
         <strong>${getCompanyPrimaryName(company)}</strong>
-        ${company.trade_name && company.company_name ? `<br><span style="font-weight: normal; font-size: 12px; color: #999;">(${company.company_name})</span>` : ''}
       </p>
       ${company.org_number ? `
       <p style="margin: 10px 0 0 0; color: #999; font-size: 12px;">

lib/email/reminder-templates.ts

@@ -180,7 +180,6 @@ export function generateReminderEmailHtml(data: ReminderEmailData): string {
         <p style="margin: 0; color: #666; font-size: 14px;">
           Med vänliga hälsningar,<br>
           <strong>${getCompanyPrimaryName(company)}</strong>
-          ${company.trade_name && company.company_name ? `<br><span style="font-weight: normal; font-size: 12px; color: #999;">(${company.company_name})</span>` : ''}
         </p>
         ${company.org_number ? `
         <p style="margin: 10px 0 0 0; color: #999; font-size: 12px;">