UX: UI 정리 — 단위 배치, 버튼 텍스트, LED OFF, Delete Pairing

도넛차트:
- InfoCard: ml/% 단위를 숫자 오른쪽에 배치 (기존 아래 → 옆)
- Void/Catheterize: 글자 크기 통일 (11+13sp → 12sp 균일)
- Disconnect → "Delete Pairing" 텍스트 변경

Placement:
- 화면 벗어날 때 LED OFF (DisposableEffect onDispose → sendLedMode(0))
- LATERAL 디버그 로그 추가 (CH4/CH5 len + symmetry)
- 대칭 기준 0.7 유지

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PiezoMonitoringView.kt

@@ -772,8 +772,8 @@ fun PiezoMonitoringView(appState: AppState) {
                     colors = ButtonDefaults.buttonColors(containerColor = MlPrimary.copy(alpha = 0.1f))
                 ) {
                     Column(horizontalAlignment = Alignment.CenterHorizontally) {
-                        Text("Void /", fontSize = 11.sp, color = MlPrimary)
+                        Text("Void /", fontSize = 12.sp, fontWeight = FontWeight.SemiBold, color = MlPrimary)
-                        Text("Catheterize", fontSize = 13.sp, fontWeight = FontWeight.SemiBold, color = MlPrimary)
+                        Text("Catheterize", fontSize = 12.sp, fontWeight = FontWeight.SemiBold, color = MlPrimary)
                     }
                 }
 
@@ -1011,18 +1011,18 @@ fun PiezoMonitoringView(appState: AppState) {
                     ) {
                         Icon(Icons.Default.LinkOff, null, tint = Color.Red, modifier = Modifier.size(16.dp))
                         Spacer(modifier = Modifier.width(6.dp))
-                        Text("Disconnect", fontSize = 13.sp, fontWeight = FontWeight.SemiBold, color = Color.Red)
+                        Text("Delete Pairing", fontSize = 13.sp, fontWeight = FontWeight.SemiBold, color = Color.Red)
                     }
                     if (showDisconnectConfirm) {
                         AlertDialog(
                             onDismissRequest = { showDisconnectConfirm = false },
-                            title = { Text("Disconnect Device") },
+                            title = { Text("Delete Pairing") },
                             text = { Text("기기 연결을 해제하고 페어링 정보를 삭제합니다.") },
                             confirmButton = {
                                 TextButton(onClick = {
                                     showDisconnectConfirm = false; showSettings = false
                                     bleManager.disconnectAndUnbond(); appState.goHome()
-                                }) { Text("Disconnect", color = Color.Red) }
+                                }) { Text("Delete", color = Color.Red) }
                             },
                             dismissButton = { TextButton(onClick = { showDisconnectConfirm = false }) { Text("Cancel") } }
                         )
@@ -1469,10 +1469,15 @@ private fun InfoCard(title: String, value: String, unit: String, color: Color, m
         Column(
             modifier = Modifier.padding(vertical = 14.dp).fillMaxWidth(),
             horizontalAlignment = Alignment.CenterHorizontally,
-            verticalArrangement = Arrangement.spacedBy(6.dp)
+            verticalArrangement = Arrangement.spacedBy(4.dp)
         ) {
-            Text(value, fontSize = 20.sp, fontWeight = FontWeight.Bold, color = Color(0xFF1C1B1F))
+            Row(verticalAlignment = Alignment.Bottom) {
-            Text(unit.ifEmpty { " " }, fontSize = 11.sp, color = MlSecondaryText)
+                Text(value, fontSize = 20.sp, fontWeight = FontWeight.Bold, color = Color(0xFF1C1B1F))
+                if (unit.isNotEmpty()) {
+                    Spacer(modifier = Modifier.width(3.dp))
+                    Text(unit, fontSize = 12.sp, color = MlSecondaryText, modifier = Modifier.padding(bottom = 2.dp))
+                }
+            }
             Text(title, fontSize = 11.sp, fontWeight = FontWeight.SemiBold, color = MlSecondaryText)
         }
     }

app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PlacementGuideView.kt

@@ -87,6 +87,11 @@ fun PlacementGuideView(appState: AppState) {
         for (i in 0 until 6) { channelDetected[i] = false; channelUrineLen[i] = 0 }
     }
 
+    // 화면 벗어날 때 LED OFF
+    androidx.compose.runtime.DisposableEffect(Unit) {
+        onDispose { bleManager.sendLedMode(0) }
+    }
+
     val detectedCount = channelDetected.count { it }
 
     val isGreenZone = isLocked || placementScore >= 70
@@ -990,6 +995,7 @@ private fun computePlacementGuide(
 
         val lrMax = maxOf(len4, len5, 1)
         val lrSymmetry = 1.0 - kotlin.math.abs(len4 - len5).toDouble() / lrMax
+        android.util.Log.d("PlacementGuide", "LATERAL ch4=$ch4(len=$len4) ch5=$ch5(len=$len5) sym=${"%.2f".format(lrSymmetry)}")
 
         if (lrSymmetry >= 0.7) {
             return PlacementGuideResult(