[FEATURE]: Dynamic OS Detection for Hero Download Button

### Feature and its Use Cases

The Problem Right now, the main Call-to-Action (CTA) button in the Hero section of the landing page is just a generic "Download" button. To reduce friction and improve the user experience, we should automatically serve the user the correct download link based on the operating system they are currently using.

Proposed Solution Implement OS auto-detection on the frontend to dynamically change the "Download" button text and link. make this exactly as it on to raise issue on github

Secondary Link: Add a subtle "Looking for another OS?" link right below the main CTA button to let users easily scroll to the section containing all three OS downloads.

### Additional Context

**Screenshot:**

### Code of Conduct

- [x] I have joined the [Discord server](https://discord.gg/hjUhu33uAn) and will post updates there
- [x] I have searched existing issues to avoid duplicates