ui: add tab bar, layout editor with drag-to-reposition

- GuiTabBar from raygui v5.0 for Player/Layout tab switching
- Layout tab: 5 draggable element placeholders (Title, Bar, Status,
  Play button, Help) — press+hold+drag to reposition
- Auto-save config file on tab switch from Layout back to Player
- config_save() added to config module
- raygui include path added to Makefile, warnings suppressed via
  #pragma for third-party header

1 files changed, 5 insertions, 0 deletions

diff --git a/src/layout_editor.h b/src/layout_editor.h
new file mode 100644
index 0000000..a05cca7
--- /dev/null
+++ b/src/layout_editor.h
@@ -0,0 +1,5 @@
+#pragma once
+#include "config.h"
+
+void layout_editor_init(void);
+void layout_editor_draw(const char *exePath, UILayout *layout);