Implement functional menu system

- Add button-driven menu with multiple options
- Wire up A button to add all Korok pins
- Connect B button to count existing pins
- Auto-initialize save system on startup
- Cleaner main loop without manual save testing

source/main.c

@@ -15,12 +15,13 @@ int main(int argc, char **argv)
     PadState pad;
     padInitializeDefault(&pad);
     
+    // Initialize save system
+    openSave();
+    processSave();
+    
     // Initialize UI
     initUI();
     
-    printMessage("Press A to test save loading\n");
-    printMessage("Press + to exit\n");
-    
     bool exit = false;
     
     // Main loop
@@ -31,11 +32,6 @@ int main(int argc, char **argv)
         
         exit = handleButtonPress(kDown);
         
-        if (kDown & HidNpadButton_A) {
-            openSave();
-            processSave();
-        }
-        
         consoleUpdate(NULL);
     }