Improves vehicle off-route detection and animation

[RichardJSun]

Describe what you are trying to do

This pull request implements vehicle off-route detection and handling to improve the accuracy of vehicle location display on the map. It also ensures the animation loop re-renders on route changes and includes minor refactoring for code clarity.

Steps for review

1. Verify that vehicles are displayed at their actual GPS position when they deviate significantly from the route.
2. Confirm that vehicle animations restart when the route is updated.
3. Check that the animation thresholds and state cleanup logic work as expected.

Issues

Fixes: off-route vehicle animation inaccuracies.

Screenshots

N/A

Additional Information

• Implements off-route detection using a distance threshold from the nearest polyline point.
• Adjusts animation thresholds for smoother transitions.
• Cleans up vehicle state on removal to prevent memory leaks.
• Ensures animation loop re-renders on route changes for accurate vehicle positioning.

[jmccand]

Hold tight, we may end up doing this logic on the backend.