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/base.js

@@ -241,6 +241,11 @@
         trigger.focus();
       }
     }
+    // Announce the close so whoever opened the modal can undo optimistic UI or
+    // clean up a dynamically-inserted overlay. A modal can be dismissed four
+    // ways — the ✕ button, a Cancel button, a backdrop click, and Escape — and
+    // the last two are handled globally here, so button-only listeners miss them.
+    el.dispatchEvent(new CustomEvent('lt:modalclose', { bubbles: true }));
   }
 
   function closeAllModals() {
@@ -2774,6 +2779,9 @@
         setTimeout(() => { if (modalEl && modalEl.parentNode) modalEl.remove(); }, 300);
         resolve(value);
       };
+      // Any dismissal counts as "no comment given", including a backdrop click or
+      // Escape, which close the overlay through the global handlers above.
+      modalEl.addEventListener('lt:modalclose', () => finish(null));
       modalEl.querySelector('[data-modal-close]').addEventListener('click', () => finish(null));
       document.getElementById(modalId + '_cancel').addEventListener('click', () => finish(null));
       document.getElementById(modalId + '_confirm').addEventListener('click', () => {