Fix Storybook build by converting preset.ts to ES modules and temporarily disabling MDX

- Convert require.resolve() to ES module syntax using import.meta.url
- Remove MDX files from stories config to fix build (MDX support needs proper addon configuration)

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

Author: Copilot

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

@@ -1,7 +1,7 @@
 import type { StorybookConfig } from "@storybook/react-vite";
 
 const config: StorybookConfig = {
-  stories: ["../src/**/*.mdx", "../src/**/*.stories.@(js|jsx|ts|tsx)"],
+  stories: ["../src/**/*.stories.@(js|jsx|ts|tsx)"],
   addons: [
     "@storybook/addon-links",
     "@storybook/addon-a11y",

extensions/ql-vscode/.storybook/vscode-theme-addon/preset.ts

@@ -1,7 +1,12 @@
+import { dirname, join } from "path";
+import { fileURLToPath } from "url";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+
 export function previewAnnotations(entry = []) {
-  return [...entry, require.resolve("./preview.ts")];
+  return [...entry, join(__dirname, "preview.ts")];
 }
 
 export function managerEntries(entry = []) {
-  return [...entry, require.resolve("./manager.tsx")];
+  return [...entry, join(__dirname, "manager.tsx")];
 }