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/questshock_native.c

@@ -103,3 +103,56 @@ JNIEXPORT void JNICALL
 Java_de_ladkau_questshock_MenuOverlay_nativeRequestLoadConfig(JNIEnv *env, jclass clazz) {
     qs_config_request_load();
 }
+
+// MenuOverlay's Video Options tab - live-appliable controls, see
+// qs_config.h. Same enqueue-only reasoning as the Save/Load buttons above.
+JNIEXPORT void JNICALL
+Java_de_ladkau_questshock_MenuOverlay_nativeRequestSetRenderer(JNIEnv *env, jclass clazz,
+                                                                jboolean opengl) {
+    qs_config_request_set_renderer(opengl);
+}
+
+JNIEXPORT void JNICALL
+Java_de_ladkau_questshock_MenuOverlay_nativeRequestSetResolution(JNIEnv *env, jclass clazz,
+                                                                  jint resolutionIndex) {
+    qs_config_request_set_resolution(resolutionIndex);
+}
+
+// Read-only queries - safe to call directly (no enqueue needed, see
+// qs_config.h's own comment on each of these).
+JNIEXPORT jboolean JNICALL
+Java_de_ladkau_questshock_MenuOverlay_nativeGetRendererIsOpenGl(JNIEnv *env, jclass clazz) {
+    return qs_config_current_renderer_is_opengl();
+}
+
+JNIEXPORT jint JNICALL
+Java_de_ladkau_questshock_MenuOverlay_nativeGetResolutionIndex(JNIEnv *env, jclass clazz) {
+    return qs_config_current_resolution_index();
+}
+
+JNIEXPORT jint JNICALL
+Java_de_ladkau_questshock_MenuOverlay_nativeGetLanguage(JNIEnv *env, jclass clazz) {
+    return qs_config_current_language();
+}
+
+// MenuOverlay's header - polled on a periodic timer (see its own comment),
+// not event-driven, so these are plain synchronous reads too.
+JNIEXPORT jfloat JNICALL
+Java_de_ladkau_questshock_MenuOverlay_nativeGetFps(JNIEnv *env, jclass clazz) {
+    return xr_session_get_fps();
+}
+
+JNIEXPORT jfloat JNICALL
+Java_de_ladkau_questshock_MenuOverlay_nativeGetFrameTimeMs(JNIEnv *env, jclass clazz) {
+    return xr_session_get_frame_ms();
+}
+
+JNIEXPORT jfloat JNICALL
+Java_de_ladkau_questshock_MenuOverlay_nativeGetCpuUtilization(JNIEnv *env, jclass clazz) {
+    return xr_session_get_cpu_utilization();
+}
+
+JNIEXPORT jfloat JNICALL
+Java_de_ladkau_questshock_MenuOverlay_nativeGetGpuUtilization(JNIEnv *env, jclass clazz) {
+    return xr_session_get_gpu_utilization();
+}