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/MessageHandler/RenderImageMessageHandler.php

@@ -70,7 +70,7 @@ final class RenderImageMessageHandler
                 : $this->projectDir . '/' . $image->getStoragePath();
             $width        = $model->width($orientation);
             $height       = $model->height($orientation);
-            $bin          = $this->renderToBin($originalPath, $width, $height);
+            $bin          = $this->renderToBin($originalPath, $width, $height, $orientation);
 
             $relPath = 'var/storage/images/' . $image->getId()
                 . '/' . $model->value . '_' . $orientation->value . '.bin';
@@ -87,7 +87,7 @@ final class RenderImageMessageHandler
         $this->em->flush();
     }
 
-    private function renderToBin(string $path, int $width, int $height): string
+    private function renderToBin(string $path, int $width, int $height, Orientation $orientation): string
     {
         $imagick = new \Imagick($path);
         $imagick->setImageAlphaChannel(\Imagick::ALPHACHANNEL_REMOVE);
@@ -95,6 +95,16 @@ final class RenderImageMessageHandler
         $imagick->mergeImageLayers(\Imagick::LAYERMETHOD_FLATTEN);
         $imagick->autoOrient();
         $imagick->cropThumbnailImage($width, $height);
+
+        // Portrait: rotate the cropped photo 90° CW so the packed .bin's row
+        // layout matches the EPD's native 800-pixel scan order. The frame is
+        // physically rotated 90° CCW for portrait (ribbon on left), so the
+        // photo's bottom edge maps to the EPD's left column. Firmware streams
+        // bytes raw — no orientation awareness on-device.
+        if ($orientation === Orientation::Portrait) {
+            $imagick->rotateImage(new \ImagickPixel('white'), 90);
+        }
+
         $imagick->setImageColorspace(\Imagick::COLORSPACE_SRGB);
 
         // Auto-levels: stretch the tonal range, clipping 1% at each end.