- Added file input and browse button for thumbnails in `upload-modal.html`.
- Updated `UploadModal.js` to handle thumbnail file selection and UI toggling.
- Updated `r2Service.js` to upload thumbnail file (if present) to R2 and update metadata.
- Ensured thumbnail keys are derived from video keys for consistent naming.
- Add new "Setup Guide" section to `docs/storage-r2.md` detailing the dual-credential requirement (S3 Keys + Cloudflare API Token) for full automation.
- Remove unsupported "manual/S3-only" workflow documentation to prevent user confusion.
- Update `js/services/r2Service.js` error message to explicitly prompt users for an API Token when the public domain is missing, instead of suggesting manual configuration.
Integrates WebTorrent client-side seeding into the Cloudflare R2 upload path.
- Adds `uploadFile` to `r2Service` for generic file uploads.
- Updates `UploadModal` to offer an optional "Create torrent & seed" flow.
- Generates magnet links and .torrent files in the browser after R2 upload.
- Uploads the .torrent file to R2 and populates `xs` tag.
- Populates `ws` (Web Seed) with the R2 public URL.
- Adds UI progress indicators for hashing and torrent upload.
- Enforces a 2GB file size limit for browser seeding to prevent crashes.
- Adds a mandatory legal rights confirmation checkbox for R2 uploads.