Ground target tracking: bearing and distance to a set of coordinates #186

Goal

Let a commander enter (or capture) a latitude/longitude on a body and get a live bearing, distance and arrival cue, for finding a spot seen on a map or noted earlier.

Scope

• Targets stored per body, named, editable in a small dialog or the card; accept pasted coordinates in common formats.
• One-click "mark current position" as a target.
• Overlay compass strip with a target marker and distance; an optional arrival alert (sound/voice through the existing voice callout service).
• The mining spot book could reuse targets; keep the data model shared rather than duplicated.

Acceptance criteria

• Typed and captured targets give correct bearing/distance (verified against the position model's tests).
• Targets persist per body and survive restarts.
• Arrival cue triggers once within a configurable radius.
• Works while the game is in SRV, on foot and in a ship near the surface.

Depends on the surface position model and the position-aware overlay.

Part of the epic #182.

Clean-room: see the rule on the epic. No SrvSurvey code, assets, maps or data.

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