Update k3sdashboard.json

Changed solar visualization panel from the plugin to a panel I built using canvas. The panel refresh is still tied to main refresh rate but any data can be added.

Grid color changes on up/down/sync status

Arrows change on flow direction

Battery should change on charge level

Solar should dim for lower production

w/kW changes alowing for low watt readings without really long kW readings

Icons stay in relative location with resize

Animated flow lines are possible with custom svg graphics and a feature like that may be added to this panel type in the future. Currently you can do linking lines with a flow direction, but the direction does not change automatically, it is just what you set it to.