test: migrate Enzyme tests to React Testing Library

Replace all 21 Enzyme test files with React Testing Library equivalents.
Remove enzyme, enzyme-adapter-react-16, enzyme-to-json and their @types
packages. Remove Enzyme config from tests/setup.ts and vitest.config.ts.
Delete commands-spec.tsx (RTL equivalents already exist in rtl-spec/).
Delete all Enzyme-generated snapshot files.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: felixrieseberg

package.json

@@ -98,8 +98,6 @@
     "@testing-library/user-event": "^14.5.2",
     "@tsconfig/node22": "^22.0.2",
     "@types/classnames": "^2.2.11",
-    "@types/enzyme": "^3.10.8",
-    "@types/enzyme-adapter-react-16": "^1.0.6",
     "@types/fs-extra": "^9.0.7",
     "@types/getos": "^3.0.1",
     "@types/node": "^22.19.1",
@@ -116,9 +114,6 @@
     "copy-webpack-plugin": "^11.0.0",
     "css-loader": "^6.7.1",
     "electron": "^40.1.0",
-    "enzyme": "^3.11.0",
-    "enzyme-adapter-react-16": "^1.15.7",
-    "enzyme-to-json": "^3.6.1",
     "eslint": "^8.45.0",
     "eslint-config-prettier": "^8.8.0",
     "eslint-import-resolver-typescript": "^3.5.5",

src/renderer/components/output.tsx

@@ -133,7 +133,7 @@ export const Output = observer(
 
       const { isConsoleShowing } = this.props.appState;
 
-      if (this.context.mosaicActions) {
+      if (this.context?.mosaicActions) {
         const mosaicTree = this.context.mosaicActions.getRoot();
         if (isParentNode(mosaicTree)) {
           // splitPercentage defines the percentage of space the first panel takes