Task 162: EP01 Jupiter-Centric Ganymede Approach Diagram + Full-Route Leg Highlighting

Status: DONE

Goal

1. Add a Jupiter-centric Ganymede approach diagram to EP01 (it's the only episode missing a local system diagram)
2. Add interactive leg highlighting to the full-route diagram (hover/click to focus on individual transfer legs)

Context

• EP02 has Jupiter-centric (escape) and Saturn-centric (Enceladus capture) diagrams
• EP03 has Uranus-centric (Titania approach) diagram
• EP04 has Uranus-centric (Titania departure) diagram
• EP05 has Earth-centric (LEO capture) and Uranus-centric (departure) diagrams
• EP01 is missing a Jupiter-centric Ganymede arrival diagram

Scope

Part 1: EP01 Ganymede Approach Diagram

• Jupiter-centric, showing Galilean moons (Io, Europa, Ganymede, Callisto)
• Brachistochrone approach arc from interplanetary space to Ganymede
• Description explaining this is the arrival phase of the 72h Mars→Jupiter transfer

Part 2: Full-Route Diagram Leg Highlighting

• Hover/click on a transfer leg in the full-route diagram to highlight it
• Mute (reduce opacity) other transfer arcs and non-relevant orbits
• Show episode label/info for the highlighted leg
• Tie to episode link (click to navigate to episode analysis)

Source: ideas/full_route_enhancements.md items 1 & 2