fix: rotate portrait renders to EPD-native byte layout

The .bin file for portrait orientation was packed as 480-pixel rows ×
800 rows, but firmware streams blindly at 800×480 (the EPD's native
scan order). Both layouts hit the same 192000-byte total, so the size
guard in epd_draw_image_with_border passed and the row-stride mismatch
showed up on the panel as the photo tiling/repeating.

Renderer now rotates the cropped photo 90° CW before dithering when
orientation is portrait, so the packed bytes always match the EPD's
800-pixel scan order. Firmware stays orientation-unaware (per the
"ESP32 never transforms images" decision in webApp/CLAUDE.md). Preview
decoder rotates -90° on the way out so the in-browser frame preview
stays upright.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/Controller/DeviceApiController.php

@@ -215,8 +215,9 @@ class DeviceApiController extends AbstractController
             $this->renderBinToPng(
                 $binPath,
                 $pngPath,
-                $device->getModel()->width($device->getOrientation()),
-                $device->getModel()->height($device->getOrientation()),
+                $device->getModel()->nativeWidth(),
+                $device->getModel()->nativeHeight(),
+                $device->getOrientation(),
             );
         }
 
@@ -229,7 +230,7 @@ class DeviceApiController extends AbstractController
         return $response;
     }
 
-    private function renderBinToPng(string $binPath, string $pngPath, int $width, int $height): void
+    private function renderBinToPng(string $binPath, string $pngPath, int $width, int $height, Orientation $orientation): void
     {
         $bin   = (string) file_get_contents($binPath);
         $len   = strlen($bin);
@@ -250,6 +251,14 @@ class DeviceApiController extends AbstractController
 
         $im = new \Imagick();
         $im->readImageBlob($ppm);
+
+        // The .bin is always laid out in EPD-native scan order. For portrait,
+        // the renderer pre-rotated the photo 90° CW; rotate -90° here so the
+        // browser-side preview shows the photo upright.
+        if ($orientation === Orientation::Portrait) {
+            $im->rotateImage(new \ImagickPixel('white'), -90);
+        }
+
         $im->setImageFormat('png');
         $im->writeImage($pngPath);
         $im->destroy();