Overhaul the VR menu UI: header, tabs, live video options, hover/click feedback, i18n, and dragging

- Header with title, git-tag-derived version, and a live FPS/frame-time/
  CPU/GPU-utilization/free-memory stats ribbon below the tab bar (FPS via
  a new per-frame tracker in xr_session.c; CPU/GPU via the OpenXR
  XR_META_performance_metrics extension, gracefully unavailable on
  runtimes that don't support it)
- Bottom tab bar with a live-editable Video Options tab (renderer/
  resolution), applying changes immediately via qs_config.c
- Hover and press feedback on every menu/keyboard button via a
  StateListDrawable (Android's default ripple never animates on this
  permanently unattached view tree), with a lighter default button color
  for visibility
- i18n for all menu/keyboard chrome text, following the game's own
  language setting (Strings.java)
- The main menu is now draggable via its header, matching the keyboard;
  xr_input.c's drag handling is generalized to per-overlay state instead
  of being keyboard-only
- The keyboard's title bar now matches the menu header's style

android/app/src/main/cpp/qs_config.c

@@ -442,6 +442,21 @@ static const char *qs_current_resolution(void) {
     return "640x480"; // shouldn't happen - safe fallback for Save
 }
 
+// ===========================================================================
+// Read-only queries for the Video Options tab (see qs_config.h)
+// ===========================================================================
+
+bool qs_config_current_renderer_is_opengl(void) { return gShockPrefs.doUseOpenGL; }
+
+int qs_config_current_resolution_index(void) {
+    for (size_t i = 0; i < QS_NUM_RESOLUTIONS; i++)
+        if (kResolutions[i].mode == mode_id)
+            return (int)i;
+    return 3; // shouldn't happen - 640x480, matches qs_current_resolution()'s own fallback
+}
+
+int qs_config_current_language(void) { return gShockPrefs.goLanguage; }
+
 // ===========================================================================
 // Apply / Save orchestration
 // ===========================================================================
@@ -557,16 +572,21 @@ static void qs_show_restart_dialog(const char *restart_needed) {
 
 static Uint32 s_save_event_type;
 static Uint32 s_load_event_type;
+static Uint32 s_set_renderer_event_type;
+static Uint32 s_set_resolution_event_type;
 
 void qs_config_load_startup(void) {
-    // Registers the custom SDL event types qs_config_request_save()/_load()
-    // enqueue - done here, once, on the engine's own thread and before the
-    // menu/its buttons could possibly exist yet, rather than lazily from
-    // those functions themselves (which run on Android's UI thread and
-    // could otherwise race each other doing this lazily).
-    Uint32 base = SDL_RegisterEvents(2);
+    // Registers the custom SDL event types qs_config_request_save()/_load()/
+    // _set_renderer()/_set_resolution() enqueue - done here, once, on the
+    // engine's own thread and before the menu/its buttons could possibly
+    // exist yet, rather than lazily from those functions themselves (which
+    // run on Android's UI thread and could otherwise race each other doing
+    // this lazily).
+    Uint32 base = SDL_RegisterEvents(4);
     s_save_event_type = base;
     s_load_event_type = base + 1;
+    s_set_renderer_event_type = base + 2;
+    s_set_resolution_event_type = base + 3;
 
     QsParsedConfig parsed;
     if (qs_config_read_file(&parsed))
@@ -587,6 +607,22 @@ void qs_config_request_load(void) {
     SDL_PushEvent(&event);
 }
 
+void qs_config_request_set_renderer(bool opengl) {
+    SDL_Event event;
+    SDL_zero(event);
+    event.type = s_set_renderer_event_type;
+    event.user.code = opengl ? 1 : 0;
+    SDL_PushEvent(&event);
+}
+
+void qs_config_request_set_resolution(int resolution_index) {
+    SDL_Event event;
+    SDL_zero(event);
+    event.type = s_set_resolution_event_type;
+    event.user.code = resolution_index;
+    SDL_PushEvent(&event);
+}
+
 bool qs_config_handle_event(const SDL_Event *event) {
     if (event->type == s_save_event_type) {
         if (qs_config_write_file())
@@ -609,5 +645,15 @@ bool qs_config_handle_event(const SDL_Event *event) {
             message_info("Configuration loaded");
         return true;
     }
+    if (event->type == s_set_renderer_event_type) {
+        qs_apply_renderer(event->user.code ? "opengl" : "software", /*live=*/true);
+        return true;
+    }
+    if (event->type == s_set_resolution_event_type) {
+        int index = event->user.code;
+        if (index >= 0 && (size_t)index < QS_NUM_RESOLUTIONS)
+            qs_apply_resolution(kResolutions[index].name, /*live=*/true);
+        return true;
+    }
     return false;
 }