Add axis labels with units to all graphs for better clarity

[Mattemn97]

Hi! First of all, thank you for this incredible project – it's both visually stunning and technically fascinating.

While using the simulator, I noticed that the graphs currently do not display labeled axes with units. For improved readability and usability, it would be extremely helpful if all graphs included:

A labeled X-axis (e.g., "Engine Speed (RPM)" for performance-related graphs, "Time (s)" for time-based plots).

A labeled Y-axis showing the appropriate unit for the measured quantity, such as:

• "Torque (Nm or lb-ft)"
• "Power (HP or kW)"
• "Throttle (%)"
• "AFR (Air-Fuel Ratio)"
• "RPM"
  etc., depending on the context of each graph

These additions would greatly enhance the user experience and make it easier to interpret the data during simulations.
If this aligns with your vision for the project, I’d be happy to contribute or help test the feature.

Thanks again for your work and dedication!