[WIP] UI: add star icon

[Copilot]

Plan: Add Star Icon to UI

• Explore repository structure and understand codebase
• Identify correct repository URL (Simon-He95/vue-markdown-render)
• Add star icon button to the interface in App.vue
• Position star icon near the settings button for consistency
• Link star icon to GitHub star page for the repository
• Test the UI with dev server
• Take screenshot to verify the visual appearance
• Run lint and build to ensure no issues

Original prompt

---

This section details on the original issue you should resolve

<issue_title>UI: add star icon</issue_title>
<issue_description>### Description

We can add a star icon to the interface so that users can click on the star for this repository.

Suggested solution

We can add a star icon to the interface so that users can click on the star for this repository.

Alternative

No response

Additional context

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #58

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