Psu type configuration (#248)

* feat: implement salary module with personnummer encryption, salary entries, tax tables, and AGI tracking

- Added personnummer encryption and decryption functions for secure storage.
- Created salary entries handling for journal entries including gross salary, tax withholding, and employer contributions.
- Implemented tax table lookup functionality for calculating tax amounts based on monthly income.
- Developed SQL migration for salary module including tables for payroll configuration, tax rates, employees, salary runs, salary run employees, salary line items, and AGI declarations.
- Established row-level security policies for all new tables to ensure company-scoped access.

* feat: add salary calculation modules for 2026

- Implemented engångsskatt calculation for one-time payments with tax brackets.
- Added löneväxling functionality for salary sacrifice to pension, including employer savings and warnings.
- Created pain.001 generator for salary batch payments in compliance with Swedish banking standards.
- Developed PDF template for payslips, including detailed breakdowns and employer costs.
- Generated seed data for Swedish tax tables for 2026, including SQL insert statements.
- Implemented traktamente calculations for per diem and mileage allowances, adhering to Skatteverket regulations.
- Added seed script for populating tax tables in the database.

* feat: Update meal reduction percentages in traktamente calculation

fix: Remove obsolete seed script for 2026 tax tables

feat: Extend SalaryRunStatus type to include 'corrected' status

feat: Implement KU10 XML generation endpoint for annual employee income statements

feat: Add endpoint for creating corrections to booked salary runs

feat: Implement endpoint for sending payslip PDFs to employees

feat: Create KU10 XML generator for annual reporting

feat: Add salary transaction matcher for auto-linking bank transactions to salary entries

chore: Add database migration for salary correction support

* feat: replace select elements with custom Select component for employment and salary types

* feat: enhance salary calculations with pension entry and avgifter category support

* feat: enhance banking settings with PSU type detection and error handling

* fix: improve error handling for bank connection and update access denial message

app/api/extensions/enable-banking/callback/route.ts

@@ -54,6 +54,14 @@ export async function GET(request: Request) {
             .from('bank_connections')
             .update({ status: 'error', error_message: errorMessage, oauth_state: null })
             .eq('id', pendingConn.id)
+
+          // Include bank name and error code in redirect so the UI can offer PSU type retry
+          const params = new URLSearchParams({
+            bank_error: errorMessage,
+            ...(pendingConn.bank_name ? { bank_name: pendingConn.bank_name } : {}),
+            ...(error === 'access_denied' ? { bank_error_code: error } : {}),
+          })
+          return NextResponse.redirect(`${baseUrl}/settings/banking?${params.toString()}`)
         }
       } catch (cleanupError) {
         console.error('[enable-banking] Failed to clean up pending bank connection:', cleanupError)