Move windows to free spot when "created" via navbar

[LBBO]

Closes feedback from #164

Reviewer's task:

• [x] I didn't see no code smells
• [x] The live preview works as expected -> no regressions found

[render[bot]]

Your Render PR Server URL is https://screenario-school-pr-165.onrender.com.

Follow its progress at https://dashboard.render.com/static/srv-cn5t62ljm4es73822pd0.