Improve experience using small screens by collapsing panels automatically

[neos-bot]

Jira issue originally created by user @aertmann:

• when clicking (focussing) a content element, the inspector panel is automatically shown, the node tree is automatically hidden
• when clicking somewhere else (unfocus), the inspector panel is hidden, the node tree is shown

this mode could be active at a specific horizontal screen size only.

Jira-URL: https://jira.neos.io/browse/NEOS-614

[neos-bot]

Comment created by @kitsunet:

Optimized modals windows