feat: improve edit tool display in web UI

package-lock.json

@@ -23,6 +23,7 @@
         "@xterm/addon-fit": "^0.11.0",
         "@xterm/xterm": "^6.0.0",
         "codemirror": "^6.0.2",
+        "diff": "^8.0.4",
         "fastify": "^5.6.1",
         "lit": "^3.3.1",
         "marked": "^18.0.3",
@@ -4942,7 +4943,6 @@
       "version": "8.0.4",
       "resolved": "https://registry.npmjs.org/diff/-/diff-8.0.4.tgz",
       "integrity": "sha512-DPi0FmjiSU5EvQV0++GFDOJ9ASQUVFh5kD+OzOnYdi7n3Wpm9hWWGfB/O2blfHcMVTL5WkQXSnRiK9makhrcnw==",
-      "dev": true,
       "license": "BSD-3-Clause",
       "engines": {
         "node": ">=0.3.1"