Planetary dynamics not working

[fabiandauth]

Implement planet dynamics to improve the physics of the gameplay. planets should circle each other according to a predefined mass parameter chosen at the beginning of the game.

[invertium]

🏴‍☠️ Aye, orbital mechanics — a grand prize! Afore I chart it, two matters need yer word, captain:

1. "a predefined mass parameter chosen at the beginning of the game" — how be it chosen? Options as I see 'em:

   • a setup/lobby screen where ye dial in each body's mass afore castin' off, or
   • fixed presets per system (Haven be light, the Ember sun be a monster), bakin'-in sensible masses so no menu-fiddlin' be needed, or
   • a single "system chaos" slider (light → heavy) that scales the whole sector's masses at once.

2. Should the planets truly orbit one another (an n-body dance that drifts over time), or ride fixed, predictable ellipses? The first be prettier but the landmarks/missions would move, which tangles with the nav-map an' mission triggers (Story is too fast and hard to follow, Map is hard to understand #8) — good to know how wild ye want the seas.

(This be close kin to the gravity work in #3 an' the orbit button in #6 — I'll build 'em as one system once we settle the feel.)

[invertium]

🏴‍☠️ Partway there — the physics half o' this be shipped on main (PR #11): every body now carries a predefined mass (a sun ~8× a planet) that drives a real gravity well pullin' ships around. That's the "improve the physics" an' "mass parameter" ye asked for, an' it's tied into gravity (#3, now closed) an' the (deferred) orbit button (#6).

What's still open here: makin' the planets literally circle each other. I held off because movin' the landmark bodies tangles with the mission triggers an' the nav-map (which assume the systems sit still) — I'd rather do that as its own careful pass than break the campaign flow. Leavin' this issue open to track that piece. Want the planets actually orbitin', or does the mass-driven gravity cover what ye were after?