Repair the T8 app.css section header after the append-only merge

The conflict resolution dropped the /* ===== opener line of the Goal 41 T8 section; restored. No rule changes.

src/pages/app.css

@@ -1620,6 +1620,7 @@ td .truncate.repo-url {
    spacing from leaking into the log panel's top margin. */
 .task-overview-panel > .subnav { margin-top: 0; }
 
+/* ==========================================================================
    Goal 41 T8 — saddles head/tail + fleet admin pages
    (saddles/users/model_settings/stack_detail; appended per the spry
    conversion contract; every value consumes a --spry-* token).