[Feature request] Create a sample Figma file as a community reference

### Description

New users of the Annotation Toolkit would benefit from seeing real examples of how annotations are applied to actual design mockups. A sample Figma file that demonstrates the toolkit in use would serve as a practical learning resource.

### Requested change

Create a companion Figma community file that shows annotated mockups, demonstrating how to use various annotation types in context.
Open questions

- Should the sample file use GitHub UI as the subject, or something more generic that any team could relate to?
- Should it aim to cover all annotation component types, or focus on the most common ones? If a subset, which ones would be most helpful to showcase first?

### Why

Seeing annotations applied in context is one of the most effective ways to learn how to use them. A reference file would lower the barrier to entry for new users and give teams a starting point they can reference when annotating their own work.

Beginne damit, die offenen Fragen zum Thema des Mockups und dazu zu klären, welche Typen von Annotationskomponenten abgedeckt werden sollen. Erstelle und veröffentliche eine begleitende Figma-Community-Datei mit annotierten Mockups, die das Toolkit im Kontext demonstriert; die Arbeit ist abgeschlossen, wenn sie neuen Benutzern eine brauchbare Referenz bietet.

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