fix: preset 감지 오류 (BV 2배 차이 근본원인) + 도넛 비율 + placement 자동통과

- autoDetectPreset: 기기이름 뒤에서 3번째 글자로 각도타입 판별
  VBT26050301 → '3' → V2 (기존: VBT2604 매칭 실패 → V0 → 각도 0° → BV 절반)
- 도넛차트: level 단계별 → maxVolumeMl/maxVolume 연속 비율로 변경
- Placement "Almost there" 3회 연속 → 자동 GREEN 통과

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

app/src/main/java/com/example/medilightv2android/managers/PiezoBVEstimator.kt

@@ -35,15 +35,20 @@ object PiezoHW {
     var activePreset: DevicePreset = DevicePreset.V0
 
     fun autoDetectPreset(deviceName: String) {
-        if (deviceName.startsWith("VBT2604") && deviceName.length >= 10) {
+        if (deviceName.startsWith("VBT") && deviceName.length >= 4) {
-            when (deviceName[8]) {
+            // VBT...n0x → 뒤에서 3번째 글자(n)가 각도 타입
-                '0' -> activePreset = DevicePreset.V0
+            // n=0 → V0, n=2 → V1, n=3 → V2
-                '2' -> activePreset = DevicePreset.V1
+            val n = deviceName[deviceName.length - 3]
-                '3' -> activePreset = DevicePreset.V2
+            activePreset = when (n) {
+                '0' -> DevicePreset.V0
+                '2' -> DevicePreset.V1
+                '3' -> DevicePreset.V2
+                else -> DevicePreset.V1  // 알 수 없으면 V1 기본
             }
         } else if (deviceName.startsWith("2025MEDIP")) {
             activePreset = DevicePreset.LEGACY_5CH
         }
+        android.util.Log.d("PiezoHW", "autoDetectPreset: '$deviceName' → ${activePreset.name}")
     }
 
     val centerCh = intArrayOf(0, 1, 2, 3)

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

@@ -761,9 +761,13 @@ fun PiezoMonitoringView(appState: AppState) {
 
             // Donut chart with Bladdy
             val donutSize = if (isCompact) 220.dp else 280.dp
+            // maxVolume 기준 비율 (0.0~1.0, 부드러운 연속값)
+            val maxVolumeForDonut = appState.piezoSettings.maxVolume.toDouble()
+            val donutProgress = if (maxVolumeForDonut > 0 && maxVolumeMl > 0)
+                (maxVolumeMl / maxVolumeForDonut).coerceIn(0.0, 1.0) else 0.0
             Box(contentAlignment = Alignment.Center) {
                 DonutChartView(
-                    progress = appState.bladderLevel.progress,
+                    progress = donutProgress,
                     urgency = urgency,
                     lineWidth = if (isCompact) 22.dp else 30.dp,
                     size = donutSize

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

@@ -96,6 +96,7 @@ fun PlacementGuideView(appState: AppState) {
     // SWEEP 추가 state
     var sweepLastDetected by remember { mutableIntStateOf(0) }
     var sweepEverSawAll by remember { mutableStateOf(false) }
+    var almostThereCount by remember { mutableIntStateOf(0) }
 
     // 화면 진입 시 상태 리셋
     LaunchedEffect(Unit) {
@@ -110,7 +111,7 @@ fun PlacementGuideView(appState: AppState) {
         rTracker.reset()
         currentRMm = null; bestRMm = 0.0
         sagittalArgMaxCh = null; lateralOffsetMm = null
-        sweepLastDetected = 0; sweepEverSawAll = false
+        sweepLastDetected = 0; sweepEverSawAll = false; almostThereCount = 0
     }
 
     // 화면 벗어날 때 LED OFF
@@ -656,10 +657,25 @@ fun PlacementGuideView(appState: AppState) {
                             lastHintChangeMs = now
                         }
 
-                        if (guideResult.isPass) {
+                        // "Almost there" 연속 3회 → 자동 GREEN 통과
+                        val isAlmostThere = guideResult.hint.contains("Almost there")
+                        if (isAlmostThere) almostThereCount++ else almostThereCount = 0
+                        val autoPass = guideResult.isPass || almostThereCount >= 3
+
+                        if (autoPass) {
                             isLocked = true
+                            almostThereCount = 0
                             if (lastLedMode != 6) { bleManager.sendLedMode(6); lastLedMode = 6 }
-                            bleManager.debugLogger.info("PLACEMENT_GREEN cv=${"%.3f".format(guideResult.cv)} lr_dev=${"%.3f".format(guideResult.lrDev)} score=${guideResult.score} otsu=${"%.0f".format(analyzer.lastOtsuThreshold)}")
+                            if (guideResult.isPass) {
+                                bleManager.debugLogger.info("PLACEMENT_GREEN cv=${"%.3f".format(guideResult.cv)} lr_dev=${"%.3f".format(guideResult.lrDev)} score=${guideResult.score} otsu=${"%.0f".format(analyzer.lastOtsuThreshold)}")
+                            } else {
+                                // Auto-pass: 위치 OK인데 CV 노이즈로 3회 연속 미달
+                                directionHint = "Green! Position locked"
+                                directionIcon = "checkmark.circle"
+                                placementScore = 70
+                                placementPhase = PlacementPhase.GREEN
+                                bleManager.debugLogger.info("PLACEMENT_GREEN_AUTO cv=${"%.3f".format(guideResult.cv)} almostThereCount=3")
+                            }
                         } else {
                             isLocked = false
                             if (lastLedMode != 5) { bleManager.sendLedMode(5); lastLedMode = 5 }