Port ListDetailsView from 7.x

**Source**: Microsoft.Toolkit.Uwp.UI.Controls (7.x)
**Destination**: TBD (not yet determined)

## Description

Presents items in a list/details pattern. Renamed to ListDetailsView in 7x.

## Prerequisites

None identified.

## Porting Basics

- [ ] Namespace updated to `CommunityToolkit.WinUI.*`
- [ ] Code for UWP, WinUI3 and Uno Platform consolidated
- [ ] Desired MultiTargets configured
- [ ] Sample code migrated
- [ ] Concept docs migrated
- [ ] Tests migrated and passing

## Quality Evaluation

See [Porting Criteria](https://github.com/CommunityToolkit/Windows/wiki/Component-Quality-Evaluation) for detailed evaluation guidance.

- [ ] UX: Accessibility reviewed
- [ ] UX: Visual design reviewed
- [ ] UX: Interaction patterns appropriate
- [ ] DX: API surface reviewed
- [ ] DX: API flexibility appropriate
- [ ] DX: Documentation updated
- [ ] MX: Breaking changes documented
- [ ] MX: Domain isolation appropriate
- [ ] MX: Test coverage adequate

## Tracking Gaps

*No gaps identified — porting work not yet started.*

## Closing

- [ ] All Porting Basics complete
- [ ] Quality Evaluation reviewed
- [ ] Gaps filed as sub-issues

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## 7x Documentation Inventory

**Docs ported to 8x**: n/a

**Docs not in 8x**: All sections

## 7x Source Inventory

**Source already ported to 8x**: n/a

**Source not ported to 8x**: All

## Notes

- Not currently planned for porting. Open to community interest.
- **Archive redirect**: https://learn.microsoft.com/en-us/dotnet/communitytoolkit/windows/archive/listdetailsview

Beginne damit, die archivierte Dokumentation zu ListDetailsView und die verknüpften Porting Criteria zu prüfen, und bestimme anschließend das Ziel, da der Issue es als TBD offenlässt. Die Arbeit ist abgeschlossen, wenn die aufgeführten Grundlagen des Portierens, die Qualitätsbewertung, die Dokumentation, die Tests und die abschließenden Prüfungen berücksichtigt wurden und alle Lücken als Sub-Issues erfasst sind.

Vom Indexierungsmodell aus dem Issue-Text verfasst.