fix: pass tab filter to execute route so only selected family is created

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/api/creation/execute/route.ts

@@ -20,8 +20,9 @@ export async function POST(req: NextRequest) {
   }
 
   const userId = (session.user as { id: string }).id
-  const body = await req.json().catch(() => ({})) as { resolutions?: MetafieldResolution[] }
+  const body = await req.json().catch(() => ({})) as { resolutions?: MetafieldResolution[]; tab?: string }
   const resolutions: MetafieldResolution[] = body.resolutions ?? []
+  const tabFilter: string | undefined = body.tab ?? undefined
   const resolutionMap = new Map<string, MetafieldResolution>(resolutions.map(r => [r.columnHeader, r]))
 
   const stream = new ReadableStream({
@@ -34,7 +35,7 @@ export async function POST(req: NextRequest) {
         ])
         const alreadyCreated = new Set(existingRows.map(e => `${e.sheetTab}:${e.sheetRow}`))
         const shopifyRefs = new Set(shopifyProducts.map(p => p.ref.trim().toLowerCase()))
-        const pending = await fetchPendingProducts(alreadyCreated)
+        const pending = await fetchPendingProducts(alreadyCreated, tabFilter)
         const total = pending.length
 
         if (total === 0) {