- Updated PriceRulesPage.vue to replace "Neu" button with a more intuitive "+" button for creating new rules.
- Enhanced QuotesPage.vue with improved handling of quote lines, including read-only states, unique line validation, and better formatting for monetary values.
- Added accordion sections for better organization of quote details and improved user experience.
- Updated SuppliersPage.vue to replace "Neu" button with a "+" button for adding new suppliers.
- Introduced new database migrations to add price category and default sales price fields to activities, and to include 'invoice_created' status in quotes.
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