docs: use percentage-based widths for README screenshots

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: retr0h

README.md

@@ -26,9 +26,11 @@ ____________   _____________________
 A terminal lock screen for macOS that uses **Touch ID** for biometric unlock with **macOS password** fallback. Drop it into tmux as your `lock-command` and walk away.
 
 <p align="center">
-  <a href="asset/screensaver.png"><img src="asset/screensaver.png" height="160" alt="Worm Screensaver"></a>
-  <a href="asset/passphrase.png"><img src="asset/passphrase.png" height="160" alt="Passphrase Prompt"></a>
-  <a href="asset/touchid.png"><img src="asset/touchid.png" height="160" alt="Touch ID Prompt"></a>
+  <a href="asset/screensaver.png"><img src="asset/screensaver.png" width="30%" alt="Worm Screensaver"></a>
+  &nbsp;&nbsp;
+  <a href="asset/passphrase.png"><img src="asset/passphrase.png" width="30%" alt="Passphrase Prompt"></a>
+  &nbsp;&nbsp;
+  <a href="asset/touchid.png"><img src="asset/touchid.png" width="30%" alt="Touch ID Prompt"></a>
 </p>
 
 ## ✨ Features