v1.2.1: edit toolview uses DSH's native ToolRow/DiffBlock chrome (DisclosureRow, collapsed by default, file link, hover diff stat, Output card on error, code-card header with icon actions, 9-row fold); keeps line-number gutter; client render smoke test

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@local/omp-edit",
-  "version": "1.2.0",
+  "version": "1.2.1",
   "description": "oh-my-pi style editing for DSH: replaces the edit tool with hashline patches (content-hash tagged line anchors, block ops, cut/paste registers, multi-file, stale-tag recovery), plus replace/sloppy/apply_patch modes; tags read and grep output.",
   "private": true,
   "type": "module",