Salvage magnet revamp (#23119)

* Generic offering window

* More work

* weh

* Parity

* Progression meter

* magnet

* rona

* PG asteroid work

* code red

* Asteroid spawnings

* clams

* a

* Marker fixes

* More fixes

* Workings of biome asteroids

* A

* Fix this loading code

* a

* Fix masking

* weh

* Fixes

* Magnet claiming

* toe

* petogue

* magnet

* Bunch of fixes

* Fix default

* Fixes

* asteroids

* Fix offerings

* Localisation and a bunch of fixes

* a

* Fixes

* Preliminary draft

* Announcement fixes

* Fixes and bump spawn rate

* Fix asteroid spawns and UI

* More fixes

* Expeditions fix

* fix

* Gravity

* Fix announcement rounding

* a

* Offset tweak

* sus

* jankass

* Fix merge

Content.Shared/Salvage/Magnet/SalvageOffering.cs

@@ -0,0 +1,9 @@
+namespace Content.Shared.Salvage.Magnet;
+
+/// <summary>
+/// Asteroid offered for the magnet.
+/// </summary>
+public record struct SalvageOffering : ISalvageMagnetOffering
+{
+    public SalvageMapPrototype SalvageMap;
+}