fix: let clients detect touch screen (MR 54)

src/mobile-config-autoconfig.js

@@ -315,6 +315,11 @@ function set_default_prefs() {
     // makes a lot of sense to enable it unconditionally, as cameras usually
     // only work with libcamera, not via plain v4l2.
     defaultPref('media.webrtc.camera.allow-pipewire', true);
+
+    // Make navigator.maxTouchPoints return 1 for clients to determine this is a
+    // touch device. This is the same value used by Web Developer Tools ->
+    // Responsive Design Mode -> Enable touch simulation.
+    defaultPref('dom.maxtouchpoints.testing.value', 1);
 }
 
 function main() {