Smaller fixes and improvements across the platform

Agent chat no longer covers menus and dropdowns Menus, dropdowns, and the help panel were being painted over by the agent chat when it was docked or maximized. They now always appear on top, as expected.
Agent panel layout is remembered after a refresh If you docked or floated the agent chat and then refreshed the page, it reopened maximized instead of restoring your chosen layout. Your last panel mode is now saved and restored correctly.
Typing an email in Add User no longer gets wiped If you typed an email address while the group list was still loading in the Add User dialog, the field could be cleared — leaving the Create button stuck disabled. Your input is now preserved regardless of how fast the groups load.