fix(notes): track + remove the select-mode Esc keydown listener so it doesn't leak per open (#2792)

static/js/notes.js

@@ -31,6 +31,9 @@ let _reminderTimer = null;
 // (previously leaked one per openPanel; on multi-open sessions this
 // stacked dozens of identical handlers).
 let _notesKeydownHandler = null;
+// Capture-phase "Esc cancels select mode" listener on document — tracked so it
+// is removed on close instead of leaking +1 per panel open/close cycle.
+let _notesSelectEscHandler = null;
 const REMINDER_FIRED_KEY = 'odysseus-notes-reminder-fired';
 // Note IDs already shown with the entry-glow once. Re-set when the user
 // reschedules the reminder so the new firing glows again on next open.
@@ -54,6 +57,10 @@ function _forceCloseNotesPanel() {
     document.removeEventListener('keydown', _notesKeydownHandler);
     _notesKeydownHandler = null;
   }
+  if (_notesSelectEscHandler) {
+    document.removeEventListener('keydown', _notesSelectEscHandler, true);
+    _notesSelectEscHandler = null;
+  }
   if (_reminderTimer) {
     clearInterval(_reminderTimer);
     _reminderTimer = null;
@@ -1270,13 +1277,17 @@ export function openPanel() {
   // than a *-bulk-cancel button, so the global Esc-cancel handler in
   // keyboard-shortcuts.js can't reach it — handle it here. Capture phase
   // + stopPropagation so Esc cancels select instead of closing the panel.
-  document.addEventListener('keydown', (e) => {
+  if (_notesSelectEscHandler) {
+    document.removeEventListener('keydown', _notesSelectEscHandler, true);
+  }
+  _notesSelectEscHandler = (e) => {
     if (e.key === 'Escape' && _selectMode) {
       e.preventDefault();
       e.stopPropagation();
       _exitSelectMode();
     }
-  }, true);
+  };
+  document.addEventListener('keydown', _notesSelectEscHandler, true);
   document.getElementById('notes-select-all').addEventListener('change', (e) => {
     if (e.target.checked) _notes.forEach(n => _selectedIds.add(n.id));
     else _selectedIds.clear();
@@ -1580,6 +1591,10 @@ export function closePanel(direction) {
     document.removeEventListener('keydown', _notesKeydownHandler);
     _notesKeydownHandler = null;
   }
+  if (_notesSelectEscHandler) {
+    document.removeEventListener('keydown', _notesSelectEscHandler, true);
+    _notesSelectEscHandler = null;
+  }
   if (_reminderTimer) {
     clearInterval(_reminderTimer);
     _reminderTimer = null;

tests/test_notes_select_esc_listener_js.py

@@ -0,0 +1,30 @@
+"""Issue #2791 — the Notes panel's capture-phase "Esc cancels select mode"
+keydown listener must be tracked and removed on close, not leaked anonymously on
+every open/close cycle.
+
+notes.js is a browser ES module with a heavy import chain (can't be node-imported
+in isolation), so — per the repo's convention for DOM-coupled guards (cf. the
+document.js diff-discard and memory.js filter-guard tests) — this asserts the
+tracked-handler pattern in source.
+"""
+from pathlib import Path
+
+SRC = Path("static/js/notes.js").read_text(encoding="utf-8")
+
+
+def test_select_esc_listener_is_tracked_not_anonymous():
+    assert "let _notesSelectEscHandler = null;" in SRC
+    # added via the tracked module-level var in capture phase
+    assert "document.addEventListener('keydown', _notesSelectEscHandler, true);" in SRC
+
+
+def test_select_esc_listener_removed_with_matching_capture_flag():
+    # remove-before-add in openPanel + removal in both close paths => >= 3,
+    # each with the `true` capture flag (a removal without it would not match).
+    removals = SRC.count("document.removeEventListener('keydown', _notesSelectEscHandler, true);")
+    assert removals >= 3, removals
+
+
+def test_old_anonymous_capture_listener_is_gone():
+    # the leak was an inline anonymous capture listener; it must no longer exist.
+    assert "addEventListener('keydown', (e) => {\n    if (e.key === 'Escape' && _selectMode)" not in SRC