chore(deps): react-widget majors -- markdown-it 15, babel 8, flow-bin 0.331

markdown-it 15 renders byte-identical HTML to 14.3.2 across headings,
lists, code, links, tables, blockquotes, raw HTML, javascript: URLs,
entities and rules, with the widget's custom table/thead/tr/td/th renderer
rules applied. Output still goes through DOMPurify before injection.

Babel 8 and flow-bin change nothing in the build: there is no babel config
in the package and Parcel transforms with SWC, so bundle sizes are
identical before and after. They are bumped to stay current.

Verified the built bundle in Chromium: modern/browser.js loads with no page
errors, renderDocsGPTWidget and renderSearchBar are both functions, and
both mount DOM.

ESLint 10 is not taken here either -- same eslint-plugin-react block as the
frontend, so eslint and @eslint/js stay on 9.

Build, tsc --noEmit and lint all clean, 0 advisories.

extensions/react-widget/package.json

@@ -42,7 +42,7 @@
     "ci": "yarn build && yarn test && yarn lint && yarn check"
   },
   "dependencies": {
-    "@babel/plugin-transform-flow-strip-types": "^7.29.7",
+    "@babel/plugin-transform-flow-strip-types": "^8.0.1",
     "@parcel/resolver-glob": "^2.16.4",
     "@parcel/transformer-svg-react": "^2.16.4",
     "@parcel/transformer-typescript-tsc": "^2.16.4",
@@ -51,16 +51,16 @@
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "dompurify": "^3.4.15",
-    "flow-bin": "^0.326.0",
-    "markdown-it": "^14.3.2",
+    "flow-bin": "^0.331.0",
+    "markdown-it": "^15.0.2",
     "react": "^19.3.0",
     "react-dom": "^19.3.0",
     "styled-components": "^6.5.3"
   },
   "devDependencies": {
-    "@babel/core": "^7.29.7",
-    "@babel/preset-env": "^7.29.7",
-    "@babel/preset-react": "^7.29.7",
+    "@babel/core": "^8.0.5",
+    "@babel/preset-env": "^8.0.5",
+    "@babel/preset-react": "^8.0.1",
     "@eslint/js": "^9.39.4",
     "@parcel/packager-ts": "^2.16.4",
     "@parcel/transformer-typescript-types": "^2.16.4",