fix(ux): reset input history on plugin dispose (F10.1)

Static InputHistoryService entries used to survive a plugin reload
because static field state doesn't get cleaned up on its own. The new
Reset() method clears the list and is wired into Plugin.DisposeAsync
alongside the existing pure-memory cleanups, so the next plugin load
starts with an empty history instead of inheriting the previous
session's typed commands.

HellionChat/InputHistoryService.cs

@@ -41,4 +41,12 @@ public static class InputHistoryService
             return null;
         return _entries[cursor];
     }
+
+    // Plugin reload doesn't reset static state automatically. Plugin.DisposeAsync
+    // calls this so the next load starts with an empty history instead of
+    // inheriting the previous session's entries.
+    public static void Reset()
+    {
+        _entries.Clear();
+    }
 }

HellionChat/Plugin.cs

@@ -372,6 +372,8 @@ public sealed class Plugin : IAsyncDalamudPlugin
         failure = CaptureFailure(failure, () => Functions?.Dispose());
         failure = CaptureFailure(failure, () => Commands?.Dispose());
         failure = CaptureFailure(failure, () => EmoteCache.Dispose());
+        // Static input history would otherwise survive the plugin reload.
+        failure = CaptureFailure(failure, InputHistoryService.Reset);
 
         if (failure is not null)
             ExceptionDispatchInfo.Capture(failure).Throw();