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Improvements

Web library downloads

• Downloads now queue: up to 4 run at once and the rest show as Queued in the downloads bar, starting automatically as others finish
• Queued downloads can be cancelled like any other download

Stability

• The app now checks available system and GPU memory before loading large models for 3D previews and thumbnails, and pauses that work under memory pressure instead of crashing
• Thumbnail generation automatically slows down when the system is running low on memory

Bug Fixes

• Fixed download clicks on web library sites being silently ignored when several downloads were started in quick succession
• Fixed two downloads with the same filename overwriting each other's files
• Fixed regenerated thumbnails uploading to cloud storage multiple times per sync cycle