Create curated Storybook exemplar files for development guidance

## Goal
Create at least 3 curated Storybook files that serve as exemplars for subsequent development.

## Context
These exemplars should demonstrate:
- How to integrate with our src modules
- Proper usage of our tech stack
- Best practices for mocking in Storybook stories

These examples will be referenced in the Storybook guidelines to help developers understand proper story structure and patterns.

## Related
- PR: https://github.com/Comfy-Org/ComfyUI_frontend/pull/8052
- Discussion: https://github.com/Comfy-Org/ComfyUI_frontend/pull/8052#discussion_r2699916424
- Requested by: @DrJKL

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-8113-Create-curated-Storybook-exemplar-files-for-development-guidance-2ea6d73d36508163bf63cee76b285fed) by [Unito](https://www.unito.io)