- Changed application name from "Minimal UI" to "SignFlow" in config-global.ts
- Updated navigation titles and paths from "User" to "Umschläge" in nav-config-dashboard.tsx
- Modified page title in user.tsx to reflect "Umschläge"
- Changed placeholder text in user-table-toolbar.tsx from "Search user..." to "Nach Umschlag suchen..."
- Updated headings and button labels in user-view.tsx to use "Umschläge" and "Neuer Umschlag"
- Commented out NavUpgrade component in nav.tsx
- Removed unused product and blog navigation items in nav-config-dashboard.tsx
- Added envelope-service.ts to handle envelope data with a basic structure
- Updated yarn.lock with dependency version changes
