Improve motor load/stall indication

From Marc: "The software communication back to the user regarding motor stalls need to be improved in a way that makes it easy for new users to clearly understand that a motor stall has occurred."

When a stall occurs:

- [ ] Change axis current position field and jog arrow button background to `#ed6666`.
- [ ] Change the main navbar current coordinates color of the stalled axis to `#ed6666`.
- [ ] Override axis state text to "_stalled_", with color `#ed6666`, when a stall has occurred for an axis.
- [ ] Revert above styles/text upon initiation of new movement (non-idle axis state).
- [ ] Change "Relative movement failed" toast for stalls to "Stall detected on Y axis"?


The following improvements are subject to change depending on the new 3D farm designer environment. Best not to start them until 3D designer is in production.

- [ ] Change nominal trail color to blue.
- [ ] Add `stroke-linecap: round;` to all trail segment styles.
- [ ] When a trail segment has missed steps, change trail color from blue (0) -> yellow (1-3) -> orange (4-6) -> red (7+).
- [ ] When user mouses over trail segments, increase stroke-width to 5 and change cursor to `pointer`.
- [ ] Add tooltip popup for when user clicks trail segments to indicate motor load for that segment.
- [ ] Remove current **FARMBOT MOTOR LOAD** layer/toggle, as the above changes replace that functionality.


- [ ] Add motor load heat map indicators on edges of map.