Jetpacks (#9023)

* Movement acceleration

* tweaks

* Weightless refactor coz fuck it

* CCVars

* weightless movement tweaks

* Some cleanup while I'm here

* dorkpacks

* thanks fork

* fixes

* zoomies

* toggles

* hmm

* yamls

* b

* so true

* Effects refactor

* namespace

* review

Content.Client/Movement/Systems/ClimbSystem.cs

@@ -0,0 +1,44 @@
+using Content.Client.Interactable;
+using Content.Client.Movement.Components;
+using Content.Shared.Climbing;
+using Content.Shared.DragDrop;
+using Robust.Shared.GameStates;
+
+namespace Content.Client.Movement.Systems;
+
+public sealed class ClimbSystem : SharedClimbSystem
+{
+    [Dependency] private readonly InteractionSystem _interactionSystem = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+        SubscribeLocalEvent<ClimbingComponent, ComponentHandleState>(OnClimbingState);
+    }
+
+    private static void OnClimbingState(EntityUid uid, ClimbingComponent component, ref ComponentHandleState args)
+    {
+        if (args.Current is not SharedClimbingComponent.ClimbModeComponentState climbModeState)
+            return;
+
+        component.IsClimbing = climbModeState.Climbing;
+        component.OwnerIsTransitioning = climbModeState.IsTransitioning;
+    }
+
+    protected override void OnCanDragDropOn(EntityUid uid, SharedClimbableComponent component, CanDragDropOnEvent args)
+    {
+        base.OnCanDragDropOn(uid, component, args);
+
+        if (!args.CanDrop)
+            return;
+
+        var user = args.User;
+        var target = args.Target;
+        var dragged = args.Dragged;
+        bool Ignored(EntityUid entity) => entity == target || entity == user || entity == dragged;
+
+        args.CanDrop = _interactionSystem.InRangeUnobstructed(user, target, component.Range, predicate: Ignored)
+                       && _interactionSystem.InRangeUnobstructed(user, dragged, component.Range, predicate: Ignored);
+        args.Handled = true;
+    }
+}