feat(core): add static Plugin.Instance handle for UI helper access

HellionChat/Plugin.cs

@@ -91,6 +91,13 @@ public sealed class Plugin : IAsyncDalamudPlugin
     public static Configuration Config = null!;
     public static FileDialogManager FileDialogManager { get; private set; } = null!;
 
+    // Single static handle to the live Plugin instance. Lets statically-accessed
+    // UI helpers (TabContextMenu) reach instance-only members — SaveConfig(),
+    // AutoTellTabsService, CustomAudioPlayer — without ctor-injection. A per-member
+    // static accessor is impossible: it would collide by name with the instance
+    // property (CS0102). Filled in the post-resolve bridge block below.
+    internal static Plugin Instance = null!;
+
     public readonly WindowSystem WindowSystem = new(PluginName);
 
     // Phase-2 services are constructed in LoadAsync; null! shape is kept
@@ -289,6 +296,10 @@ public sealed class Plugin : IAsyncDalamudPlugin
         );
 
         _host = PluginHostFactory.Build(this, dependencies);
+
+        // Bridge the static handle before the instance members below are read.
+        Instance = this;
+
         _lifecycle = _host.Services.GetRequiredService<PluginLifecycle>();
         _lifecycle.Host = _host;