refactor(app): compose settings and developer tools

src/AcDream.App/Input/PlayerModeController.cs

@@ -17,7 +17,9 @@ namespace AcDream.App.Input;
 /// chase-camera lifetimes. The window host wires this owner but never mutates
 /// those slots directly.
 /// </summary>
-internal sealed class PlayerModeController : ILocalPlayerTeleportModeOperations
+internal sealed class PlayerModeController :
+    ILocalPlayerTeleportModeOperations,
+    IDevToolsPlayerModeTarget
 {
     private readonly LocalPlayerModeState _mode;
     private readonly LocalPlayerControllerSlot _controllerSlot;

src/AcDream.App/Input/QuiescentInputContext.cs

@@ -4,13 +4,20 @@ using Silk.NET.Input;
 
 namespace AcDream.App.Input;
 
+internal interface IDevToolsInputContext : IInputContext, IDisposable
+{
+    bool IsDisposalComplete { get; }
+    void Activate();
+    void Deactivate();
+}
+
 /// <summary>
 /// Non-owning input-context view for third-party frontends such as Silk's
 /// ImGuiController. It interposes named device relays so frontend callbacks can
 /// be silenced before a long live-session close and physically detached later,
 /// without disposing the canonical Silk input context.
 /// </summary>
-internal sealed class QuiescentInputContext : IInputContext
+internal sealed class QuiescentInputContext : IDevToolsInputContext
 {
     private readonly IInputContext _inner;
     private readonly HostQuiescenceGate _quiescence;