Testing Code Syntax Highlighting & Media Embeds

Here's a test post with various content types: Python code example: python```a = "hello world" print(a) for i in range(3): print(f"Count: {i}")``` JavaScript example: javascript```const greeting = "Hello, World!"; console.log(greeting); function sayHello(name) { return `Hello, ${name}!`; }``` Media embedding examples: **Embedded YouTube video:** [youtube](https://www.youtube.com/watch?v=W6NZfCO5SIk) **Direct YouTube URL (auto-detected):** https://www.youtube.com/watch?v=W6NZfCO5SIk **Embedded image:** ![Sample Image](https://picsum.photos/600/300?random=1) **Linked image (clickable):** [image](https://picsum.photos/400/200?random=2) **Embedded video file:** [video](https://sample-videos.com/zip/10/mp4/SampleVideo_1280x720_1mb.mp4) **Linked video file:** [video-link](https://sample-videos.com/zip/10/mp4/SampleVideo_1280x720_1mb.mp4) **Auto-detected image URL:** https://picsum.photos/500/250?random=3 **Auto-detected video URL:** https://sample-videos.com/zip/10/mp4/SampleVideo_640x360_1mb.mp4 And here's an inline `code snippet` that should be highlighted.

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