Notes editor (#7980)

* Support for thematic breaks

- Use the '-' character

* Improve "read only" mode

* Refactor markdown notes editor

- Revert back to simplemde
- Remove package dependencies for mdxeditor
- Fix up buttons / preview / save sequencing

* Update playwright tests

* Cleanup toolbar buttons

* Enable "side by side" mode

* Update UI text

src/frontend/vite.config.ts

@@ -48,6 +48,13 @@ export default defineConfig({
     sourcemap: is_coverage
   },
   server: {
+    proxy: {
+      '/media': {
+        target: 'http://localhost:8000',
+        changeOrigin: true,
+        secure: true
+      }
+    },
     watch: {
       // use polling only for WSL as the file system doesn't trigger notifications for Linux apps
       // ref: https://github.com/vitejs/vite/issues/1153#issuecomment-785467271