Auto-enable WASD mode for admins on login

GPS Test Mode (WASD movement) now automatically enables when an admin
user logs in, improving the development/testing experience.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

index.html

@@ -9205,6 +9205,13 @@
                 if (currentUser.is_admin) {
                     editTab.style.display = '';
                     adminTab.style.display = '';
+
+                    // Auto-enable GPS Test Mode (WASD) for admins
+                    const gpsTestToggle = document.getElementById('gpsTestModeToggle');
+                    if (gpsTestToggle && !gpsTestMode) {
+                        gpsTestToggle.checked = true;
+                        toggleGpsTestMode(true);
+                    }
                 } else {
                     editTab.style.display = 'none';
                     adminTab.style.display = 'none';