Add/csv import options (#420)

* feat(import): add customer and supplier parsing functionality

- Implemented customer file parsing in `lib/import/customers/parser.ts` with support for Excel and CSV formats.
- Created types for detected customer columns and parsed customer rows in `lib/import/customers/types.ts`.
- Added tests for customer classification logic in `lib/import/shared/__tests__/classify.test.ts`.
- Developed classification functions for customers and suppliers in `lib/import/shared/classify.ts`.
- Introduced shared column utility functions in `lib/import/shared/column-utils.ts`.
- Implemented supplier file parsing in `lib/import/suppliers/parser.ts` with validation for various fields.
- Created types for detected supplier columns and parsed supplier rows in `lib/import/suppliers/types.ts`.
- Added tests for supplier column detection and parsing in `lib/import/suppliers/__tests__/column-detector.test.ts` and `lib/import/suppliers/__tests__/parser.test.ts`.

* fix(labels): update 'Svenskt företag' to 'Svenskt företag eller organisation' for clarity

* feat(import): refactor encoding handling for Swedish files and add tests for character preservation

* feat(recapt): implement clearRecaptIdentity function and integrate into logout flow

* feat(bookkeeping): implement copy functionality and next voucher sequence retrieval

* feat(import): enhance customer and supplier import functionality with normalization and event handling

components/customers/CustomerForm.tsx

@@ -144,7 +144,7 @@ export default function CustomerForm({
               </SelectTrigger>
               <SelectContent>
                 <SelectItem value="individual">Privatperson (Sverige)</SelectItem>
-                <SelectItem value="swedish_business">Svenskt företag</SelectItem>
+                <SelectItem value="swedish_business">Svenskt företag eller organisation</SelectItem>
                 <SelectItem value="eu_business">EU-företag</SelectItem>
                 <SelectItem value="non_eu_business">Företag utanför EU</SelectItem>
               </SelectContent>