feat: add script [Duolingo Hide App Popups]

Author: rxliuli

README.md

@@ -1,5 +1,6 @@
 # My UserScripts
 
+- [Duolingo Hide App Popups](./src/plugins/duolingo-hide-popups/README.md): Hide annoying app download popups and restore scrolling on Duolingo.
 - [Reddit Ctrl+Enter Sender](./src/plugins/reddit-ctrl-enter-sender/README.md): Send Reddit comments with Ctrl+Enter.
 - [Reddit Search Options Persist](./src/plugins/reddit-search-options-persist/README.md): Keep Reddit search filters when searching with new keywords.
 - [YouTube Music Background Play](./src/plugins/youtube-music-background-play/README.md): Enable background play on YouTube Music.

src/plugins/duolingo-hide-popups/README.md

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+# Duolingo Hide App Popups
+
+A userscript that hides annoying app download popups on Duolingo and restores normal page scrolling.
+
+## What it does
+
+This userscript automatically hides:
+
+- App download overlays (containing adj.st links)
+- Drawer backdrops that block interaction
+- Restores scrolling on the main page content
+
+## Installation
+
+1. Install a userscript manager like [Tampermonkey](https://www.tampermonkey.net/) or [Greasemonkey](https://www.greasespot.net/)
+2. Download the userscript from <https://github.com/rxliuli/userscripts/releases/latest/download/duolingo-hide-popups.user.js>
+
+## How it works
+
+The userscript runs at document-start and injects CSS rules to:
+
+- Hide overlay elements that contain app download links (`#overlays:has([href*="adj.st"])`)
+- Hide drawer backdrop elements (`[data-test="drawer-backdrop"]`)
+- Restore scrolling to the root element (`#root { overflow: auto !important; }`)

src/plugins/duolingo-hide-popups/manifest.ts

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+import type { MonkeyUserScript } from 'vite-plugin-monkey'
+
+export function manifest(): MonkeyUserScript {
+  return {
+    name: 'Duolingo Hide App Popups',
+    namespace: 'https://rxliuli.com',
+    description: 'Hide app popups and restore scrolling on Duolingo.',
+    match: ['https://www.duolingo.com/**'],
+    'run-at': 'document-start',
+    author: 'rxliuli',
+    license: 'GPL-3.0-only',
+  }
+}

src/plugins/duolingo-hide-popups/userscript.ts

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+function injectStyles() {
+  const style = document.createElement('style')
+  style.textContent = `
+#overlays:has([href*="adj.st"]), [data-test="drawer-backdrop"] {
+  display: none !important;
+}
+
+#root {
+  overflow: auto !important;
+}
+  `.trim()
+  document.head.appendChild(style)
+  console.log('✨ Duolingo popups hidden')
+}
+
+injectStyles()