Full UX overhaul of the edit page targeting non-technical users:
- Grouped fields into four labelled sections (Wer & Wann, Beschreibung, Transkription, Datei)
- Replaced date text field with native <input type="date">
- Replaced sender <select> with PersonTypeahead component
- Replaced receiver multi-select with new PersonMultiSelect (chip-based)
- Sticky save bar at bottom with cancel/save actions
- Aligned all colours to brand palette (no more blue-*)
- Fixed a11y: replaced invalid <label> on compound components with <p>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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