hanzo-edit: mount the contribute widget (repo=hanzoai/chat)

Bump react/react-dom ^18.2.0 -> ^19.2.0 (resolves 19.2.4) and
@types/react{,-dom} -> ^19.2.0 across client, packages/client,
packages/api, packages/data-provider. packages/client peer already
allowed ^19.1.0.

Feasibility: no dependency hard-pegs React 18; one React 19.2.4 in the
tree (no dual-React). Production frontend build is GREEN (vite build has
no tsc gate; workspace rollup builds use check:false). Client tsc was
already red on main (997 errors, not a build/CI gate); React 19 adds ~95
mechanical type errors (RefObject<T|null>, useRef() arg) that do not gate
the build.

Runtime NOT yet verified: recoil@0.7.7 (deprecated, still present next to
jotai), @react-spring/web@9.7.5, react-avatar-editor@13.0.2 and Radix
1.0.x peer-warn on 19 but are 19-compatible in practice. Needs a human
chat + guest + billing smoke test before ship.

client/index.html

@@ -47,6 +47,9 @@
     <script defer type="module" src="/src/main.jsx"></script>
     <!-- Hanzo Analytics -->
     <script async src="https://analytics.hanzo.ai/hz.js" data-site="hanzo.chat"></script>
+    <!-- Hanzo Edit — ever-present "improve this page" widget (fork→edit→PR; anyone can suggest) -->
+    <meta name="hanzo:repo" content="hanzoai/chat" />
+    <script async src="https://hanzo.app/edit.js"></script>
     <!-- Hanzo Insights (Insights) - only loaded when VITE_INSIGHTS_KEY is set -->
     <script>
       (function() {

client/package.json

@@ -92,11 +92,11 @@
     "micromark-extension-llm-math": "^3.1.0",
     "qrcode.react": "^4.2.0",
     "rc-input-number": "^7.4.2",
-    "react": "^18.2.0",
+    "react": "^19.2.0",
     "react-avatar-editor": "^13.0.2",
     "react-dnd": "^16.0.1",
     "react-dnd-html5-backend": "^16.0.1",
-    "react-dom": "^18.2.0",
+    "react-dom": "^19.2.0",
     "react-flip-toolkit": "^7.1.0",
     "react-gtm-module": "^2.0.11",
     "react-hook-form": "^7.43.9",
@@ -139,8 +139,8 @@
     "@types/js-cookie": "^3.0.6",
     "@types/lodash": "^4.17.15",
     "@types/node": "^20.3.0",
-    "@types/react": "^18.2.11",
-    "@types/react-dom": "^18.2.4",
+    "@types/react": "^19.2.0",
+    "@types/react-dom": "^19.2.0",
     "@vitejs/plugin-react": "^4.3.4",
     "autoprefixer": "^10.4.20",
     "babel-plugin-replace-ts-export-assignment": "^0.0.2",

packages/api/package.json

@@ -63,7 +63,7 @@
     "@types/multer": "^1.4.13",
     "@types/node": "^20.3.0",
     "@types/node-fetch": "^2.6.13",
-    "@types/react": "^18.2.18",
+    "@types/react": "^19.2.0",
     "@types/winston": "^2.4.4",
     "jest": "^30.2.0",
     "jest-junit": "^16.0.0",

packages/client/package.json

@@ -90,8 +90,8 @@
     "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^14.0.0",
     "@types/jest": "^29.5.14",
-    "@types/react": "^18.2.11",
-    "@types/react-dom": "^18.2.4",
+    "@types/react": "^19.2.0",
+    "@types/react-dom": "^19.2.0",
     "babel-jest": "^30.2.0",
     "caniuse-lite": "^1.0.30001741",
     "concat-with-sourcemaps": "^1.1.0",
@@ -101,8 +101,8 @@
     "jest-environment-jsdom": "^30.2.0",
     "jotai": "^2.12.5",
     "lucide-react": "^0.525.0",
-    "react": "^18.2.0",
-    "react-dom": "^18.2.0",
+    "react": "^19.2.0",
+    "react-dom": "^19.2.0",
     "react-i18next": "^15.4.0",
     "rimraf": "^6.1.2",
     "rollup": "^4.0.0",

packages/data-provider/package.json

@@ -57,7 +57,7 @@
     "@types/jest": "^29.5.2",
     "@types/js-yaml": "^4.0.9",
     "@types/node": "^20.3.0",
-    "@types/react": "^18.2.18",
+    "@types/react": "^19.2.0",
     "@types/winston": "^2.4.4",
     "jest": "^30.2.0",
     "jest-junit": "^16.0.0",