feat(galaxy): randomly generated galaxy and system map renderer

[ScottyVenable]

Owner: Sol

Goal

Build a visual galaxy map and per-system map that renders the existing
procedurally generated galaxy, scales to both mobile portrait and 16:9
desktop layouts, and lets the player tap or click systems and stations to
navigate. This replaces ΓÇö or augments, at Sol's design discretion ΓÇö the
current text-based Helm screen list.

Acceptance criteria

• Galaxy view:
  • Renders all star systems with their faction colour.
  • Currently selected system is highlighted.
  • Current player location is marked with a distinct ring.
• System view:
  • Zoom-in showing stations within a system.
  • Station kind icons are visually distinct.
  • Distance and risk labels are present and legible.
• Reads from the existing src/engine/galaxy.ts. If the schema needs
  anything new, that becomes a Sol-tracked sub-task on this issue.
• Renderer is SVG, not canvas, for crisp scaling and accessibility.
• Mobile portrait: single column, pinch / drag to pan within bounds.
• Desktop 16:9: fits the main column with a small mini-map slotted into
  the right rail.
• Performance budget: 60 fps pan on a mid-range phone with up to 200
  systems.
• Reduced-motion preference respected on map transitions.
• No emoji, no Math.random.

Out of scope

• Combat visualisation.
• Faction conflict / war-front visualisation.

Branch

feat/sol-galaxy-map

Notes

• Suggested size: XL, estimate 13.
• Target milestone: v0.3.0-alpha.
• Sol may split this into sub-issues for galaxy renderer, system renderer,
  and interaction layer. Sub-issues will be linked via REST sub_issue_id
  to this parent.

ΓÇö Jesse

Sub-tasks

• galaxy(renderer): SVG galaxy view with pan/zoom #94 — galaxy(renderer): SVG galaxy view with pan/zoom
• galaxy(renderer): SVG system view with station markers #95 — galaxy(renderer): SVG system view with station markers
• galaxy(ui): mini-map and Helm integration #96 — galaxy(ui): mini-map and Helm integration