refactor(webui): add StateButton, centralize active style, fix refresh lifecycle

refactor(webui): add StateButton, centralize active style, fix refresh lifecycle

- StateButton: stateless toggle driven by server state (active prop)
- Button: owns .button--active CSS, ToggleButton/StateButton pass :active
- Conditional buttons: show Start/Stop, Open/Close, Lock/Unlock based on state
- refreshChargingStations(): shared composable eliminates 4x duplicated refresh
- executeAction() helper in CSData/CSConnector: DRY action/toast/refresh
- Fix: trigger getChargingStations() on need-refresh event
- Fix: refresh after AddChargingStations, StartTransaction, SetSupervisionUrl
- table-layout: fixed on connectors table to prevent overflow