Feature Request: Bidirectional Joystick Card for ESP Dash Pro

[inF1704]

Add setValue() Method to Joystick Card for Bidirectional Control

### Description
Currently, the Joystick Card only supports user input from dashboard to controller. This feature request proposes adding bidirectional functionality to enable setting joystick position programmatically, which would be particularly useful for applications like level/tilt displays.

### Proposed Functionality

// New method for Joystick class
void setValue(int x, int y);  // Set joystick position (-60 to +60 range)

Use Cases

• Digital spirit level/bubble level display
• Equipment tilt angle visualization
• Machine orientation feedback
• Remote system position monitoring

Technical Implementation

1. Add setValue() method to Joystick class
2. Implement WebSocket message handling for position updates
3. Update joystick position in UI when receiving new coordinates
4. Maintain existing input functionality while adding output capability

Benefits

• Enables new visualization use cases
• Maintains backward compatibility
• Provides intuitive visual feedback for sensor data
• Reduces need for custom implementations

Impact

This enhancement would expand the Joystick Card's utility while maintaining its current functionality, making it a true bidirectional control element.