Move controller-poll info from Injection to Controllers panel

The per-slot XInput poll rates and the "game reading controller" summary
describe the controller, not the injection mechanism, so move them to the
Controllers panel (renamed from debug_overlay -> ControllersPanel, now a class
that owns the poll-rate sampling). The panel now shows both directions: the
guest pads the host receives from RPT, and what the injected game reads back.

The Injection panel keeps the hook attach state, focus spoof, focus-API
counts, and input-path diagnostics, and points to the Controllers panel for
poll rates.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

host/src/main.cpp

@@ -15,8 +15,8 @@
 
 #include "audio_panel.hpp"
 #include "capture_panel.hpp"
+#include "controllers_panel.hpp"
 #include "d3d11_window.hpp"
-#include "debug_overlay.hpp"
 #include "imgui_layer.hpp"
 #include "injection_panel.hpp"
 #include "input/xinput_source.hpp"
@@ -64,6 +64,7 @@ int run()
 	}
 
 	auto input = std::make_unique<coop::XInputSource>();
+	coop::ControllersPanel controllers;
 	coop::InjectionPanel injection;
 	coop::AudioPanel audio;
 	coop::CapturePanel capture;
@@ -105,7 +106,7 @@ int run()
 			coop::draw_main_menu_bar(ui, stats);
 			if (ui.show_controllers)
 			{
-				coop::draw_controllers_panel(*input, ui.debug_details);
+				controllers.draw(*input, injection.hook_status(), ui.debug_details);
 			}
 			if (ui.show_injection)
 			{