@youtube with additional chat message doesn't work as intended

[zeroliu]

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• Screenshot of note + Copilot chat pane + dev console added (required)

Copilot version: 2.7.15

Describe how to reproduce
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When calling @youtube with additional chat message, the response returns error.

Attempt 1: @youtube https://www.youtube.com/watch?v=SM66GDRyIVY
Response 1: Transcripts of the youtube video

Attempt 2: tell me about @youtube https://www.youtube.com/watch?v=SM66GDRyIVY
Response 2: It seems there was an error while trying to transcribe the YouTube video you mentioned. If you can provide some details about the video's content or its title, I can help you with information related to that topic!

Expected behavior
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Use @youtube with additional chat message should fetch the youtube transcripts, too.

Screenshots
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Additional context
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[logancyang]

Thanks for the fix!

My thinking is that in the next iteration, it should work with or without @youtube for youtube video URLs, so "URL mentions" should call this youtube4llm endpoint if it detects a youtube URL. But that can be a separate PR.