YouTube: Add a transcript variable with linked timestamps

[sotayamashita]

Describe the solution you'd like

When taking study notes from YouTube videos, I want to click timestamps in Obsidian to jump to the corresponding position in the video.

Currently {{transcript}} outputs timestamps as plain bold text:

**0:00** · Introduction
**1:30** · Main topic
**1:01:01** · Summary

I'd like a way to get timestamps as clickable YouTube links:

[0:00](https://www.youtube.com/watch?v=VIDEO_ID&t=0s) Introduction
[1:30](https://www.youtube.com/watch?v=VIDEO_ID&t=90s) Main topic
[1:01:01](https://www.youtube.com/watch?v=VIDEO_ID&t=3661s) Summary

Possible approaches

1. New variable in Clipper (e.g. {{transcriptLinked}}) — post-process {{transcript}} in buildVariables() to convert bold timestamps into YouTube links. {{transcript}} stays unchanged for backward compatibility.
2. Defuddle-side change — Defuddle could output linked timestamps directly, benefiting all consumers.

Reference implementation

I prototyped approach 1: diff

Changes:

• extractYouTubeVideoId() — extracts video ID from YouTube URLs (watch, youtu.be, embed, shorts)
• linkTranscriptTimestamps() — converts **MM:SS** / **HH:MM:SS** to markdown links with computed seconds
• buildVariables() — generates {{transcriptLinked}} when URL is YouTube and transcript exists
• Registered in PRESET_VARIABLES for template validation
• Unit and integration tests included