Fix Cowork model selection and Windows CLI packaging (#1129)

Cherry-picked from upstream PR #1129 + local improvements:
- dedupe inline remove-model handler -> use handleRemoveModel
- add .next-cli-build/ and cli/.build-home/ to .gitignore

cli/package.json

@@ -42,6 +42,7 @@
   ],
   "license": "MIT",
   "devDependencies": {
+    "esbuild": "^0.25.12",
     "nodemon": "^3.1.14"
   }
 }