docs: add Google Play link to ecosystem table

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: vveerrgg

README.md

@@ -183,7 +183,7 @@ This app does not collect any user data or transmit any data over a network conn
 | Platform | Repo | Description |
 |----------|------|-------------|
 | **Browser** | [nostrkey.browser.plugin.src](https://github.com/HumanjavaEnterprises/nostrkey.browser.plugin.src) | Chrome + Safari extension — [Chrome Web Store](https://chromewebstore.google.com/detail/nostrkey/cggakcmbihnpmcddkkfmoglgaocnmaop) |
-| **Android** | [nostrkey.app.android.src](https://github.com/HumanjavaEnterprises/nostrkey.app.android.src) | Native Android app (dual-WebView + AndroidBridge) |
+| **Android** | [nostrkey.app.android.src](https://github.com/HumanjavaEnterprises/nostrkey.app.android.src) | Native Android app — [Google Play](https://play.google.com/store/apps/details?id=com.nostrkey.app) |
 | **iOS** | [nostrkey.app.ios.src](https://github.com/HumanjavaEnterprises/nostrkey.app.ios.src) | Native iOS app (dual-WKWebView + IOSBridge) — this repo |
 
 Both mobile apps bundle the browser extension's HTML/JS/CSS assets and run them inside WebViews. A platform-specific polyfill layer translates Chrome extension APIs (`chrome.storage.local`, `chrome.runtime.sendMessage`) into native equivalents. The apps are independent of the Safari extension companion app found in `nostrkey.browser.plugin.src/apple/`.