Re-issue WiFi scan on the periodic refresh timer

The WiFi page only re-read the access-point list every 3s, so a scan
that was slow, denied, or interrupted left the network list permanently
empty until a manual F5. Re-request the scan on each timer tick (skipped
while a connection attempt is in flight) so results appear automatically
once NetworkManager completes a scan.

src/wifi_setup_page.cpp

@@ -220,6 +220,15 @@ void WiFiSetupPage::update(float dt) {
     refreshTimer_ += dt;
     if (refreshTimer_ >= 3.0f) {
         refreshTimer_ = 0.0f;
+
+        // Re-issue a scan on every tick rather than only re-reading results:
+        // NetworkManager only reports access points from completed scans, so a
+        // slow or failed first scan would otherwise leave the list empty
+        // forever. Skipped while a connection attempt is running to avoid
+        // churning the radio mid-connect.
+        if (state_ && !connectInProgress_) {
+            state_->network.requestScan();
+        }
         refreshNetworkState();
 
         // During the First-Run walkthrough, leave the WiFi page automatically