fix: Inaccurate Summary When Youtube Videos Have No Transcript Enabled

[bytrangle]

#fixes #140

Problem Description

When given a Youtube video without CC (Closed Caption) enabled, this app will try to use yt-dlp to download the video, then use a model to transcribe and summarize it. However, if the user specifies Gemini as the model, yt-dlp and transcription are skipped and the app defaults to a summary based on the HTML page description.

Root Cause

geminiApiKey wasn't passed to transcription object when calling createLinkPreviewClient in runUrlFlow. This caused resolveTranscriptionConfig to resolve geminiApiKey as null, making hasAnyProvider false and therefore canRunYtDlp false. So yt-dlp is never started.

Test the new changes

1. Clear all the transcription and summary cache

rm -f ~/.summarize/cache.sqlite
rm -rf ~/.summarize/cache

2. At the root directory, run build script with pnpm build
3. Test a Youtube video without CC, bypassing summary cache and media cache

pnpm run summarize "https://www.youtube.com/watch?v=hhAbp3iQA44" --no-cache --no-media-cache

[steipete]

Landed via temp rebase onto main.

• Gate: pnpm -s check
• Land commit: 8994739986dd9caaddc9be4884a9d8be156e1b4c
• Merge commit: fc13e2c9b87c7cb7851701018d36a156c0b151f5

Thanks @bytrangle!