Draft: window: Increase breakpoint width

António Fernandes requested to merge wip/antoniof/threshold-adjustment into main

500sp is too narrow. Windows barely above the threshold have only 1 column in grid view at default size, and those barely below have 3 grid columns. and list view just above the threshold has too little space for filename.

592 was the minimum width before gtk4 port and seems to work better.

Fixes #3001 (closed)

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