Dismissing the required-comment modal no longer looks like a close (#20)

A modal can be dismissed four ways: the ✕ button, Cancel, a backdrop click, or
Escape. base.js handles the last two globally (a document click handler and
registerKey('escape', closeAllModals)), so the status-change modal — which wired
only the two buttons — never learned it had been dismissed. The status dropdown
kept displaying the new status even though update_ticket.php was never called,
so the ticket looked closed with no comment until a reload showed it still open.

The same gap left every dynamically-inserted modal in the DOM when dismissed
that way, so the next open inserted a duplicate id that shadowed the live one.

- base.js closeModal now dispatches a bubbling lt:modalclose event (synced to
  web_template as bbec859), and _statusCommentModal treats it as "no comment".
- ticket.js reverts the dropdown on any dismissal, guarded against the re-entry
  its own lt.modal.close() would otherwise cause.
- dashboard.js gains openModalWithDismiss() so all seven dynamic modals plus the
  generic prompt modal tear down however they are dismissed.

Verified in headless chromium against all four dismissal routes plus a
confirm-with-comment control: 22/22. Against the pre-fix files the same test
fails 6 assertions — backdrop and Escape leave the dropdown on "Closed *" with
an orphaned overlay — so it reproduces the reported behaviour exactly.

assets/js/ticket.js

@@ -529,7 +529,19 @@ function updateTicketStatus() {
         `);
         const modal = document.getElementById(modalId);
         lt.modal.open(modalId);
-        const cleanup = (ok) => { lt.modal.close(modalId); setTimeout(() => modal.remove(), 300); if (!ok) statusSelect.selectedIndex = 0; };
+        let settled = false;
+        const cleanup = (ok) => {
+            if (settled) return;   // lt.modal.close() below re-enters via lt:modalclose
+            settled = true;
+            lt.modal.close(modalId);
+            setTimeout(() => modal.remove(), 300);
+            if (!ok) statusSelect.selectedIndex = 0;
+        };
+        // Backdrop click and Escape close the overlay through base.js's global
+        // handlers. Without this the dropdown kept displaying the new status
+        // while the server was never called, so the ticket looked closed until
+        // a reload revealed it was still open.
+        modal.addEventListener('lt:modalclose', () => cleanup(false));
         modal.querySelector('[data-modal-close]').addEventListener('click', () => cleanup(false));
         document.getElementById(`${modalId}_cancel`).addEventListener('click', () => cleanup(false));
         document.getElementById(`${modalId}_confirm`).addEventListener('click', () => {