fix: scale indicator, logo crop, gateway LAN IP, setup spacing

webapp:
- Scale indicator: replace plain green dot with ⚖️ emoji + colored
  status badge (green/amber/grey/red); icon fades out when disconnected;
  tap shows a toast with device name + battery level
- Logo images: crop excess transparent padding from logo.png and
  logo_icon.png so content fills the frame at small display sizes
- style.css: reworked .scale-status-indicator CSS for emoji+badge

kiosk:
- SetupActivity: use device's real LAN IP for scale_gateway_url
  (was hardcoded 127.0.0.1 — only worked if server and kiosk run on
  the same machine); added getDeviceLanIp() helper (prefers wlan/eth)
- activity_setup.xml: reduce welcome step padding/margins so step 1
  fits on screen without scrolling; text sizes slightly reduced
- activity_setup.xml: fix feature bullet 'Bilancia Bluetooth via
  Gateway app' → 'Bilancia BLE integrata (nessuna app esterna)'
- strings.xml (en + it): rewrite all wizard_gateway_* strings to
  reflect integrated BLE service instead of external gateway APK
- ic_logo.png: regenerated at all densities from cropped source

assets/js/app.js

@@ -805,6 +805,23 @@ function _scaleUpdateStatus(state) {
     el.title = labels[state] || '';
 }
 
+/**
+ * Show a brief toast with the current scale connection status when the icon is tapped.
+ */
+function _scaleShowInfo() {
+    const state = _scaleConnected ? 'connected' : 'disconnected';
+    const msgs = {
+        connected:    `⚖️ ${t('scale.status_connected')}${_scaleDevice ? ': ' + _scaleDevice : ''}${_scaleBattery != null ? ' 🔋' + _scaleBattery + '%' : ''}`,
+        searching:    `⚖️ ${t('scale.status_searching')}`,
+        disconnected: `⚖️ ${t('scale.status_disconnected')}`,
+        error:        `⚖️ ${t('scale.status_error')}`,
+    };
+    const el = document.getElementById('scale-status-indicator');
+    const cls = el ? [...el.classList].find(c => c.startsWith('scale-status-') && c !== 'scale-status-indicator') : null;
+    const key = cls ? cls.replace('scale-status-', '') : state;
+    showToast(msgs[key] || msgs[state], key === 'connected' ? 'success' : 'info');
+}
+
 /**
  * Show the scale reading modal and wait for a stable weight, then populate the input.
  * @param {string} targetInputId  — ID of the <input> to fill