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.h

@@ -37,14 +37,47 @@ void qs_config_load_startup(void);
 void qs_config_request_save(void);
 void qs_config_request_load(void);
 
-// Returns true and handles the event if it's one of the two custom events
-// qs_config_request_save()/_load() enqueue - called from pump_events()
-// (sdl_events.c, see android/engine-patches/21-android-config.patch) on the
-// engine's own thread, once per polled event, before its normal switch on
-// well-known SDL_* event types. Returns false (no-op) for any other event
-// type, including before the two custom types have even been registered.
+// Same cross-thread-dispatch reasoning as qs_config_request_save()/_load()
+// above - called from the Video Options tab's controls (MenuOverlay.java),
+// which are just as much on Android's UI thread as the Save/Load buttons.
+// opengl=true/false selects "opengl"/"software"; resolution_index is 0-4,
+// indexing the same table qs_config_current_resolution_index() below
+// reads. Applies live immediately (no restart involved - see CONFIG.md);
+// unlike Load Configuration, these don't post a message_info() HUD
+// notification for every single tap - the tab's own selection highlight is
+// the feedback.
+void qs_config_request_set_renderer(bool opengl);
+void qs_config_request_set_resolution(int resolution_index);
+
+// Returns true and handles the event if it's one of the four custom events
+// qs_config_request_save()/_load()/_set_renderer()/_set_resolution()
+// enqueue - called from pump_events() (sdl_events.c, see
+// android/engine-patches/21-android-config.patch) on the engine's own
+// thread, once per polled event, before its normal switch on well-known
+// SDL_* event types. Returns false (no-op) for any other event type,
+// including before the four custom types have even been registered.
 bool qs_config_handle_event(const SDL_Event *event);
 
+// Read-only queries for the Video Options tab's own selection highlight
+// (MenuOverlay.java re-reads these whenever the tab is (re)shown, so it
+// reflects the live value even if it was last changed some other way, e.g.
+// the Ctrl+G hotkey or Load Configuration). Safe to call directly from
+// Android's UI thread despite not going through the event-queue dispatch
+// the mutating calls above use - same low-risk reasoning already used for
+// Save Configuration's own reads of gShockPrefs/mode_id: these are simple,
+// independent POD scalar reads, not a sequence that needs to be atomic
+// with anything else.
+bool qs_config_current_renderer_is_opengl(void);
+int qs_config_current_resolution_index(void);
+
+// gShockPrefs.goLanguage (0 English/1 French/2 German, Prefs.h) - read by
+// MenuOverlay.java's/KeyboardOverlay.java's periodic header-refresh timer
+// to pick which language's chrome text (Strings.java) to display, so a
+// language change made mid-session via the game's own options menu is
+// picked up without needing to reopen either panel. Same
+// off-thread-scalar-read reasoning as the two getters above.
+int qs_config_current_language(void);
+
 #ifdef __cplusplus
 }
 #endif