fix: LittleFS partition label mismatch and display rotation (180°)

Co-authored-by: Cursor <cursoragent@cursor.com>

src/display_manager.cpp

@@ -17,8 +17,7 @@ void DisplayManager::begin(PowerManager& power) {
     _display = &M5.Display;
 
     // Set rotation for landscape (device physically rotated)
-    // Rotation value depends on how the display is mounted — likely 1 or 3
-    _display->setRotation(1);
+    _display->setRotation(3);
 
     Serial.printf("[display] Initialized: %dx%d, rotation=%d\n",
                   _display->width(), _display->height(), _display->getRotation());