TL;DR
- Fixes #643: Limit final chunk joining and integrity checks to prevent concurrent disk saturation.
- Fixes #786: Add dedicated New download and New upload buttons.
- Fixes #787: Replace Remove all except this with the clearer Keep this action.
- Fixes #789: Fix proxy-field paste menus on macOS, including Control-click and the password field.
Other
- Localized the final chunk-joining wait status.
- Version bumped to 8.60.