fix(settings): preserve stored logo + persist editor changes on save

app/routes/app.settings.tsx

@@ -101,12 +101,21 @@ export const action = async ({ request }: ActionFunctionArgs) => {
   //   2. Remove the current logo (`removeLogo=on`).
   //   3. Provide an external URL via the `logoUrl` field.
   // If a file is uploaded it wins over a manually-entered URL.
-  let resolvedLogoUrl = str("logoUrl");
+  // Look up the existing logoUrl so we don't accidentally clear it when
+  // the user just edited unrelated fields (the visible URL field is hidden
+  // for stored uploads, so it submits empty in that case).
+  const existing = await db.shopSettings.findUnique({
+    where: { shopDomain: session.shop },
+    select: { logoUrl: true },
+  });
+  const submittedLogoUrl = str("logoUrl");
   const removeLogo = bool("removeLogo");
   const logoFile = form.get("logoFile");
   const hasUpload =
     logoFile && typeof logoFile === "object" && "size" in logoFile && (logoFile as File).size > 0;
 
+  let resolvedLogoUrl = submittedLogoUrl || existing?.logoUrl || "";
+
   if (removeLogo && !hasUpload) {
     await deleteStoredLogo(session.shop);
     resolvedLogoUrl = "";