#Nostur TestFlight update (build 453)

macOS columns update:
- Added Bookmark column
- Added Explore column
- Added New Posts notifications column
- Added icons to feed selector
(Activate multiple columns mode by enabling Nostur Pro in Settings.)

Other updates (all platforms):
- Fixed duplicate relay connection issue
- Fixed crash
- Performance optimizations

TestFlight: https://nostur.com/testflight
Source code: