Port CanvasPathGeometry from 7.x

**Source**: Microsoft.Toolkit.Parsers (7.x)
**Destination**: CommunityToolkit.WinUI.* (8.x) — not yet ported

## Description

The CanvasPathGeometry class facilitates the drawing and manipulation of complex geometrical shapes.

## 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.

- [n/a] UX: Accessibility reviewed
- [n/a] UX: Visual design reviewed
- [n/a] 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**:
- Summary
- Examples
- Creating CanvasGeometry with CanvasPathGeometry
- Creating Color
- From Hexadecimal Color String or High Dynamic Range Color String
- From High Dynamic Range Color (Vector4)
- Creating ICanvasBrush
- Creating CanvasStrokeStyle
- Creating ICanvasStroke
- Compositor Extension Methods
- Creating a Squircle

## 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/canvaspathgeometry

Inizia individuando il codice sorgente di CanvasPathGeometry in Microsoft.Toolkit.Parsers 7.x e la documentazione archiviata di CanvasPathGeometry, quindi confronta la struttura di CommunityToolkit.WinUI.*. Esamina gli esempi e i criteri di porting elencati prima di pianificare i target UWP, WinUI 3 e Uno Platform. Il lavoro è completato quando sono terminati la checklist del porting, gli esempi e i documenti concettuali migrati, i test, la revisione dell’API e la valutazione della qualità.

Scritto dal modello di indicizzazione a partire dal testo della issue.