Download MotrixNext 3.7.3

What's Changed
This release resolves duplicate download tasks caused by deep-link event duplication across all three platforms, adds browser cookie forwarding for authenticated downloads, and simplifies the extension auto-submit settings.
✨ New Features
- Browser cookie forwarding — The browser extension now extracts cookies from the download context and passes them to aria2 via deep-link parameters. This enables authenticated downloads from sites like Quark Drive, Baidu Pan, and other cookie-gated CDNs.
🛠 Improvements
- Simplified auto-submit settings — Replaced the 5-toggle "Browser Extension" section with a single toggle merged into "Notification & Confirm". Config schema automatically migrates from v2 to v3.
- Refined task completion tracking — Replaced debug traces with explicit completion tracking in the monitor service for more reliable shutdown-on-complete behavior.
- Improved error handling — Downgraded noisy fetchList errors to debug level to reduce log clutter during normal operation.
🐛 Bug Fixes
- Fixed duplicate download tasks from deep-links — A triple-redundant event registration caused the same URL to be processed 2–3 times on all platforms. Unified by scoping macOS on_open_url to #[cfg(target_os = "macos")] and removing the redundant frontend onOpenUrl() listener.
- Fixed .torrent URL auto-submit — Auto-submitting a .torrent URL passed it to addUri(), which downloaded the .torrent file itself instead of parsing its content. Torrent and metalink URLs now always route through the AddTask dialog's fetch→parse→file-select pipeline.