Replace `react-markdown` with `streamdown` (minus mermaid) (#29977)

GitOrigin-RevId: c78f7c537f17085fd3e8a6189c6ade59ff98eb9f

package.json

@@ -40,6 +40,9 @@
     "request@2.88.2": {
       "tough-cookie": "5.1.2",
       "form-data": "2.5.5"
+    },
+    "streamdown": {
+      "mermaid": "file:./services/web/stubs/mermaid-stub"
     }
   },
   "scripts": {

services/web/package.json

@@ -378,7 +378,6 @@
     "react-google-recaptcha": "^3.1.0",
     "react-i18next": "^13.3.1",
     "react-linkify": "^1.0.0-alpha",
-    "react-markdown": "^10.1.0",
     "react-refresh": "^0.14.0",
     "react-resizable-panels": "^2.1.1",
     "react-syntax-highlighter": "^15.6.6",
@@ -397,6 +396,7 @@
     "sinon-chai": "^3.7.0",
     "sinon-mongoose": "^2.3.0",
     "storybook": "^8.6.12",
+    "streamdown": "^1.6.9",
     "stylelint-config-standard-scss": "^13.1.0",
     "tailwindcss": "^3.4.4",
     "terser-webpack-plugin": "^5.3.9",

services/web/stubs/mermaid-stub/index.d.ts

@@ -0,0 +1 @@
+export type MermaidConfig = unknown

services/web/stubs/mermaid-stub/index.js

@@ -0,0 +1 @@
+export default {}

services/web/stubs/mermaid-stub/package.json

@@ -0,0 +1,5 @@
+{
+  "name": "mermaid",
+  "version": "11.999.999",
+  "description": "Empty stub for the mermaid package"
+}