Screen Shake Intensity Slider in Accessibility Settings (#24749)

* Reduced motion toggle disables screen shake

* Actually, screen shake is its own slider instead

* Cache screen shake intensity cvar

Content.Client/Camera/CameraRecoilSystem.cs

@@ -1,14 +1,34 @@
 using System.Numerics;
 using Content.Shared.Camera;
+using Content.Shared.CCVar;
+using Robust.Shared.Configuration;
 
 namespace Content.Client.Camera;
 
 public sealed class CameraRecoilSystem : SharedCameraRecoilSystem
 {
+    [Dependency] private readonly IConfigurationManager _configManager = default!;
+
+    protected float Intensity;
+
     public override void Initialize()
     {
         base.Initialize();
         SubscribeNetworkEvent<CameraKickEvent>(OnCameraKick);
+
+        _configManager.OnValueChanged(CCVars.ScreenShakeIntensity, OnCvarChanged, true);
+    }
+
+    public override void Shutdown()
+    {
+        base.Shutdown();
+
+        _configManager.UnsubValueChanged(CCVars.ScreenShakeIntensity, OnCvarChanged);
+    }
+
+    private void OnCvarChanged(float value)
+    {
+        Intensity = value;
     }
 
     private void OnCameraKick(CameraKickEvent ev)
@@ -18,9 +38,14 @@ public sealed class CameraRecoilSystem : SharedCameraRecoilSystem
 
     public override void KickCamera(EntityUid uid, Vector2 recoil, CameraRecoilComponent? component = null)
     {
+        if (Intensity == 0)
+            return;
+
         if (!Resolve(uid, ref component, false))
             return;
 
+        recoil *= Intensity;
+
         // Use really bad math to "dampen" kicks when we're already kicked.
         var existing = component.CurrentKick.Length();
         var dampen = existing / KickMagnitudeMax;