properties-window: Set minimum size for the properties window

The properties window can be shrunk to a size that heavily truncates everything inside the window. Set a minimum size of 360x294px to fix that.

Screencast_from_2023-08-25_19-14-57

Reference: https://developer.gnome.org/hig/guidelines/adaptive.html

Fixes #3075 (closed)

Edited by Automeris naranja

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