v1.4.6

Changes

• Add loading spinner to "Waiting for configuration data..." message when device is connected
• Show no-response warning as a red alert on the config tab after 10s timeout (with emonTx4/5 jumper hint)
• Fix false "pending changes" appearing briefly when switching between devices
• Persist active config sub-tab (Calibration/Sensors/Misc) in localStorage
• Add Spanish (es) language support