* add guards to reject missing sub commands
* mask/zone bugfixes
- fix websocket crash when creating a new mask or zone before a name is assigned
- fix deleted masks and zones not disappearing from the list until navigating away
- fix deleting profile override not reverting to the base mask in the list
- fix inertia defaulting to nan
* disable save button on invalid form state
* fix validation for speed estimation
* ensure polygon is closed before allowing save
* require all masks and zones to be on the base config
* clarify dialog message and tooltip when removing an override
* clarify docs
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