fix: relay buttons always enabled, touch sensor inversion, version bump

- MainActivity: remove isServer check — relay buttons always enabled when
  connected, regardless of device mode (fixes silently broken buttons when
  device mode accidentally set to 'client')
- client.cpp: invert HS-S43A touch sensor readings (!tActive) — sensors
  are active LOW
- build.gradle: bump versionCode 2, versionName 1.1
- platformio.ini: use stable by-id port for server ESP32
- firmware/*.bin: rebuilt with LED signaling and touch fixes

platformio.ini

@@ -11,7 +11,7 @@ build_flags =
 lib_deps =
     fastled/FastLED@^3
     h2zero/NimBLE-Arduino@^2
-upload_port = /dev/ttyACM1
+upload_port = /dev/serial/by-id/usb-Espressif_USB_JTAG_serial_debug_unit_44:1B:F6:F4:CF:14-if00
 upload_speed = 115200
 upload_flags = --no-stub
 build_src_filter = +<main.cpp> -<client.cpp>