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feat: enhance error handling and validation infrastructure - Add comprehensive Zod error helper with German localization - Migrate from deprecated .toPromise() to firstValueFrom() - Enhance global error handler with ZodError support - Implement storage features for signal stores with auto-save - Add comprehensive test coverage for validation scenarios - Update multiple stores with improved storage integration - Extend tab management with enhanced navigation patterns - Add checkout data-access barrel exports - Update core-storage documentation with usage examples Major improvements: - Complete German error message translations for all Zod validation types - Auto-save with configurable debouncing for signal stores - Type-safe storage integration with schema validation - Enhanced entity management with orphan cleanup - Robust fallback strategies for validation failures Breaking: Requires Zod validation errors to use new helper Refs: #5345 #5353 Related work items: #5345, #5353