v3.4.1

Added

• panel: check for updates by hand, from the About tab

Fixed

• custom-sounds: "None" can be chosen on a list that opens at its bottom
• custom-sounds: a picker opens at once, with "None" in it
• custom-sounds: "None" is always offered, and Preferences no longer jumps
• custom-sounds: notification sounds play your file on a Mac
• loader: a Slack preference reaches the layer Slack rebuilds from