Replaces the old multi-card layout (1368 lines) with a compact, modern
tabbed interface (Stammdaten | Nachweise | Zahlungen | Timeline | Dokumente | Notizen).
All information is now accessible from one page without excessive clicking.
- Add timeline events to destinataer_detail view (merged from timeline view logic)
- Compact profile header with avatar initials, status badges, key contact info
- Inline editing preserved with table-based layout for cleaner data display
- Tab state persisted in URL hash for bookmarkable deep links
- Dropdown menu for less-used actions (export, archive, delete)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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