Add hover over satellite explanation to tutorial

[wannerdev]

Description

Enhances the tutorial system by adding a new step that teaches players about the hover mechanic for viewing satellite orbits.

Changes

• Added already_hovered_satellite field to HudState resource
• Added satellite_query parameter to update_explanation_text function
• Implemented new tutorial step: "HOVER OVER SATELLITE TO VIEW ORBIT"
• Tutorial now progresses through three steps:
  1. Launch satellite (HOLD/RELEASE LMB TO LAUNCH)
  2. Hover over satellite (HOVER OVER SATELLITE TO VIEW ORBIT)
  3. Use thruster (PRESS SPACE TO SLOW DOWN)
• Only applies to desktop (mouse) input - mobile tutorial unchanged

Tutorial Flow

Before:

• Launch -> Space to slow down -> Hide

After:

• Launch -> Hover over satellite -> Space to slow down -> Hide

Benefits

• Players discover the hover mechanic naturally
• Better understanding of orbit visualization
• Smoother learning curve for satellite management
• Helps players learn to select satellites for thruster control

Testing

• Start game and launch a satellite
• Verify tutorial shows hover instruction
• Hover over the satellite
• Verify tutorial progresses to space instruction
• Press space and verify tutorial hides

Related Issue

Fixes: Tutorial - Hover over satellite should be explained in tutorial