feat(conversation): replicate in-place user message editing (TODO 03)

scripts/rea/probe-user-message-edit-cancel-20261017.json

@@ -0,0 +1,13 @@
+{
+  "include_fonts": false,
+  "include_message_content": false,
+  "track_selectors": [
+    ".cr-self-bubble",
+    ".cr-toolbar",
+    ".cr-user-message-editor"
+  ],
+  "actions": [
+    { "kind": "click", "step_id": "cancel-editor", "selector": ".cr-user-message-editor__cancel", "index": 0, "frames": 0 },
+    { "kind": "wait", "step_id": "editor-closed", "duration_ms": 500, "frames": 1 }
+  ]
+}