first drafts for inventory sync page

internal/site/response/cookie.go

@@ -42,6 +42,10 @@ func (c cookieRes) Redirect(code redirect.Code, to string) Response {
 	return Redirect(code, to).wrap(c)
 }
 
+func (c cookieRes) HTML(body []byte) Response {
+	return HTML(body).wrap(c)
+}
+
 func (c cookieRes) JSON(body any) Response {
 	return JSON(body).wrap(c)
 }
@@ -85,3 +89,11 @@ func (c cookieRes) getCookies() []http.Cookie {
 
 	return []http.Cookie{c.cookie}
 }
+
+func (c cookieRes) getContentType() (contentType string, ok bool) {
+	if c.res != nil {
+		return c.res.getContentType()
+	}
+
+	return "", false
+}