Fix UI spacing issues

internal/server/server_test.go

@@ -1458,6 +1458,21 @@ func (h *harness) postForm(t *testing.T, path string, form url.Values, cookie *h
 
 // The delete token is shown once and then has to be usable somewhere. The info
 // page is the link an uploader would have kept, so the form lives there.
+// detailsIsOpen reports whether the page's first <details> is rendered open,
+// by reading the attribute rather than matching the whole tag: the element
+// carries classes too, and styling it must not be able to fail this.
+func detailsIsOpen(page string) bool {
+	start := strings.Index(page, "<details")
+	if start < 0 {
+		return false
+	}
+	end := strings.Index(page[start:], ">")
+	if end < 0 {
+		return false
+	}
+	return strings.Contains(page[start:start+end], " open")
+}
+
 func TestInfoPageAcceptsTheDeleteToken(t *testing.T) {
 	h := newHarness(t, nil)
 	res := decode[uploadResult](t, h.upload(t, []byte("x"), nil))
@@ -1510,7 +1525,7 @@ func TestWrongDeleteTokenReturnsToTheInfoPage(t *testing.T) {
 	if !strings.Contains(page, "not correct") {
 		t.Error("the page does not say what went wrong")
 	}
-	if !strings.Contains(page, "<details open>") {
+	if !detailsIsOpen(page) {
 		t.Error("the delete section is collapsed, hiding the error")
 	}
 	if _, err := h.store.Get(res.ID, h.now); err != nil {