* Rename ElectronStore to LegacyStore for clarity in subscription manager.
* Remove unused deep link state in AppContent and add a TODO for future handling.
* Introduce a new DownloadDialog component for managing downloads.
* Update DownloadItem to include a details sheet for video metadata.
* Enhance PlaylistDownloadGroup to persist expanded state in local storage.
* Improve UnifiedDownloadHistory layout and integrate DownloadDialog for better user interaction.
* Update various UI components for consistency and improved styling.
* Add new localization strings for download actions across multiple languages.
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