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

src/client.cpp

@@ -368,8 +368,8 @@ void loop() {
     }
     prevBtnActive = btnActive;
 
-    bool relay1State = t1Active || btnActive;
-    bool relay2State = t2Active;
+    bool relay1State = !t1Active || btnActive;
+    bool relay2State = !t2Active;
 
     CRGB ledColor;
 
@@ -459,8 +459,8 @@ void loop() {
     static uint32_t heartbeat = 0;
     if (millis() - heartbeat > 60000) {
         Serial.printf("[heartbeat] t1=%s t2=%s btn=%s r1=%s r2=%s connected=%s\n",
-            t1Active ? "YES" : "no",
-            t2Active ? "YES" : "no",
+            !t1Active ? "YES" : "no",
+            !t2Active ? "YES" : "no",
             btnActive ? "YES" : "no",
             relay1State ? "ON" : "OFF",
             relay2State ? "ON" : "OFF",