Fix EEPROM save load

UIThread.cpp

@@ -109,7 +109,7 @@ void setupUI() {
   display.display();
   
   // Initialize EEPROM
-  EEPROM.begin(1024);
+  EEPROM.begin(2048);
 
   // Check for safety clear (Button held on startup)
   if (digitalRead(PIN_ENC_SW) == LOW) {
@@ -320,13 +320,13 @@ void checkSerial() {
             }
         } else if (state == 1) { // Count
             elementCount = b;
-            if (1 + elementCount * 5 > sizeof(buffer)) {
+            if (1 + elementCount * 5 + 1 > sizeof(buffer)) {
                 state = 0;
                 bufferIdx = 0;
                 Serial.println(F("ERROR: Grid too large"));
             } else {
                 buffer[bufferIdx++] = b;
-                state = 2;
+                state = (elementCount == 0) ? 3 : 2;
             }
         } else if (state == 2) { // Data
             buffer[bufferIdx++] = b;