Fix: Always update print area coordinates when editing product

- Print area was only updated if a new image was uploaded
- Now print area is updated even when keeping existing image
- Fixes design area positioning mismatch on made-to-order page
- Applies to both front and back print areas

.claude/settings.local.json

@@ -105,7 +105,8 @@
       "Bash(git commit -m 'Fix: Handle image removal in product editor *)",
       "Bash(git commit -m 'Refactor: Move image display into PhotoPrintAreaField component *)",
       "Bash(git commit -m 'Optimize: Skip color photo processing when not uploading new photos *)",
-      "Bash(git commit -m 'Optimize: Fetch only necessary fields from database *)"
+      "Bash(git commit -m 'Optimize: Fetch only necessary fields from database *)",
+      "Bash(git commit -m 'Fix: Always update print area coordinates when editing product *)"
     ]
   }
 }

src/app/admin/products/actions.ts

@@ -291,13 +291,13 @@ export async function updateProduct(formData: FormData) {
 
   // Handle front photo: new upload, removal, or keep existing
   const removeImage = String(formData.get('removeImage') ?? '') === '1';
+  const hasCustomPrintArea = String(formData.get('hasCustomPrintArea') ?? '') === '1';
+
   if (removeImage) {
     data.imageUrl = null;
     data.printArea = JSON.stringify(DEFAULT_PRINT_AREAS[mockup] ?? DEFAULT_PRINT_AREAS.tshirt);
   } else if (imageFile && imageFile.size > 0) {
     data.imageUrl = await fileToDataUrl(imageFile);
-
-    const hasCustomPrintArea = String(formData.get('hasCustomPrintArea') ?? '') === '1';
     data.printArea = JSON.stringify(
       hasCustomPrintArea
         ? {
@@ -308,17 +308,37 @@ export async function updateProduct(formData: FormData) {
           }
         : DEFAULT_PRINT_AREAS[mockup] ?? DEFAULT_PRINT_AREAS.tshirt,
     );
+  } else if (existing.imageUrl) {
+    // No new image uploaded, but existing image present — still update print area if custom
+    if (hasCustomPrintArea) {
+      data.printArea = JSON.stringify({
+        xPct: Number(formData.get('printX') ?? 0.3),
+        yPct: Number(formData.get('printY') ?? 0.25),
+        wPct: Number(formData.get('printW') ?? 0.4),
+        hPct: Number(formData.get('printH') ?? 0.35),
+      });
+    }
   }
 
   // Handle back photo: new upload, removal, or keep existing
   const removeImageBack = String(formData.get('removeImageBack') ?? '') === '1';
+  const hasCustomPrintAreaBack = String(formData.get('hasCustomPrintAreaBack') ?? '') === '1';
+
   if (removeImageBack) {
     data.imageUrlBack = null;
     data.printAreaBack = null;
   } else if (imageBackFile && imageBackFile.size > 0) {
     data.imageUrlBack = await fileToDataUrl(imageBackFile);
-
-    const hasCustomPrintAreaBack = String(formData.get('hasCustomPrintAreaBack') ?? '') === '1';
+    if (hasCustomPrintAreaBack) {
+      data.printAreaBack = JSON.stringify({
+        xPct: Number(formData.get('printXBack') ?? 0.3),
+        yPct: Number(formData.get('printYBack') ?? 0.25),
+        wPct: Number(formData.get('printWBack') ?? 0.4),
+        hPct: Number(formData.get('printHBack') ?? 0.35),
+      });
+    }
+  } else if (existing.imageUrlBack) {
+    // No new image uploaded, but existing image present — still update print area if custom
     if (hasCustomPrintAreaBack) {
       data.printAreaBack = JSON.stringify({
         xPct: Number(formData.get('printXBack') ?? 0.3),