Establish Proof of Concept: Component with Write/WritePartial Helpers

[piraz]

Create a proof of concept (POC) demonstrating the core Component abstraction in the candango/uiok project. Showcase practical usage by integrating the previously defined Write and WritePartial helper functions to output rendered component content. This POC will serve as a working reference for the framework’s usage and future development.

Tasks

• Implement a minimal Component struct or interface that fulfills the core requirements (e.g., Render(), Partial() methods).
• Create a basic concrete component with sample output.
• Demonstrate usage of the Write and WritePartial functions with this component, targeting an io.Writer (such as os.Stdout or a bytes.Buffer).
• Include an example (e.g. in examples/poc.go) showing how to render both full and partial output via the helpers.
• Add clear code comments and minimal documentation to guide usage and onboarding.

Acceptance Criteria

• The repository contains a self-contained POC example for components using the output helpers.
• Write and WritePartial successfully render and write component output to an io.Writer.
• Example code is well-commented and serves as a practical guide for project contributors.
• Code builds and example runs without errors.

[piraz]

This is working in a sense, but will change in another ticket to get everything in the same page.

Closing this ticket by now.