First public AMO release.

What it does
- Right-click any YouTube watch page → "Save to Sheet" — or use the on-open prompt
that asks once per video whether you want to save it.
- A small note card appears at the cursor (isolated in a closed Shadow DOM). You can
add a note and tags before saving.
- Captures title, channel, channel link, URL, watched / total time, your note, tags,
and an auto-derived status (Watched / Partially watched / Opened).
- Upsert: saving the same video again updates its existing row (note appended, tags
merged, watched time refreshed) — no duplicate rows.
- Create a sheet, pick an already-created one, or open it in a new tab — all from
the options page. Light / dark / auto theme + English / Turkish UI.
- Privacy-first: data goes straight from your browser to Google. No third-party
servers, no analytics, no ads. The extension can only touch the Sheets it created
(drive.file scope).