Re-enable MDX support for Storybook v10

- Install @storybook/addon-docs package
- Add addon-docs to the addons configuration in main.ts
- Update Overview.mdx to use @storybook/addon-docs/blocks import path
- Re-enable MDX files in stories configuration
- Verify build succeeds with MDX documentation included

Co-authored-by: d10c <9970661+d10c@users.noreply.github.com>

Author: Copilot

extensions/ql-vscode/.storybook/main.ts

@@ -1,8 +1,9 @@
 import type { StorybookConfig } from "@storybook/react-vite";
 
 const config: StorybookConfig = {
-  stories: ["../src/**/*.stories.@(js|jsx|ts|tsx)"],
+  stories: ["../src/**/*.mdx", "../src/**/*.stories.@(js|jsx|ts|tsx)"],
   addons: [
+    "@storybook/addon-docs",
     "@storybook/addon-links",
     "@storybook/addon-a11y",
     "./vscode-theme-addon/preset.ts",

extensions/ql-vscode/package-lock.json

@@ -2110,6 +2110,7 @@
     "@microsoft/eslint-formatter-sarif": "^3.1.0",
     "@playwright/test": "^1.50.1",
     "@storybook/addon-a11y": "^10.1.11",
+    "@storybook/addon-docs": "^10.1.11",
     "@storybook/addon-links": "^10.1.11",
     "@storybook/components": "^8.6.14",
     "@storybook/csf": "^0.1.13",

extensions/ql-vscode/package.json

@@ -1,4 +1,4 @@
-import { Canvas, Meta, Story } from '@storybook/blocks';
+import { Canvas, Meta, Story } from '@storybook/addon-docs/blocks';
 
 import iframeImage from './images/update-css-variables-iframe.png';
 import stylesImage from './images/update-css-variables-styles.png';