fix(phase26): skip netwatch AP scan when clients connected (BUG-01)

deploy/yaris_uplink.py

@@ -220,9 +220,28 @@ def restore_fallback():
     return False
 
 
+def _ap_client_count():
+    """Return number of stations connected to the AP on INTERFACE."""
+    try:
+        proc = subprocess.run(
+            ["iw", "dev", INTERFACE, "station", "dump"],
+            capture_output=True, text=True, timeout=5,
+        )
+        return proc.stdout.count("Station ")
+    except (OSError, subprocess.SubprocessError):
+        return 0
+
+
 def check_uplink():
     current = active_connection()
     phone_configured = connection_exists(PHONE_CONNECTION)
+
+    # Never tear down the AP if a client is connected — the user is actively
+    # using the hotspot (e.g. phone browsing the web UI while driving).
+    # Skip this netwatch cycle and let the next one try again.
+    if current == AP_CONNECTION and _ap_client_count() > 0:
+        write_status("ap_has_clients_skipped_check")
+        return True
     if current == PHONE_CONNECTION:
         if internet_reachable():
             write_status("phone_connected")