feat: UI 일괄 수정 (9개 항목 중 1,2,3,4,9번)

1+2. Placement peak 감도: urineLen >= 10 필터 (짧은 false positive 방지)
3. Placement 센서 그림(SensorLayoutCanvas) 제거
4. 앱 이름: MediLight → VesiScan-Basic (홈화면 + strings.xml)
9. BLE 신호: Good+Excellent 통합 (rssi >= -65 → Green 4칸)

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

app/src/main/java/com/example/medilightv2android/ui/views/connection/DeviceScanView.kt

@@ -350,13 +350,12 @@ private fun DeviceRow(device: BleDevice, isConnecting: Boolean, enabled: Boolean
 @Composable
 private fun SignalBars(rssi: Int) {
     val strength = when {
-        rssi >= -50 -> 4
-        rssi >= -65 -> 3
+        rssi >= -65 -> 4  // Good+Excellent 통합 → Green
         rssi >= -80 -> 2
         else -> 1
     }
     val color = when {
-        strength >= 3 -> Color.Green
+        strength >= 4 -> Color.Green
         strength == 2 -> Color(0xFFFF9500)
         else -> Color.Red
     }
@@ -374,7 +373,6 @@ private fun SignalBars(rssi: Int) {
 }
 
 private fun signalLabel(rssi: Int): String = when {
-    rssi >= -50 -> "Excellent"
     rssi >= -65 -> "Good"
     rssi >= -80 -> "Fair"
     else -> "Weak"

app/src/main/java/com/example/medilightv2android/ui/views/home/HomeView.kt

@@ -34,7 +34,7 @@ fun HomeView(appState: AppState) {
 
         Spacer(modifier = Modifier.height(24.dp))
 
-        Text("MediLight", fontSize = 32.sp, fontWeight = FontWeight.Bold)
+        Text("VesiScan-Basic", fontSize = 32.sp, fontWeight = FontWeight.Bold)
 
         Spacer(modifier = Modifier.height(4.dp))
 

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

@@ -151,16 +151,7 @@ fun PlacementGuideView(appState: AppState) {
                 modifier = Modifier.padding(top = 8.dp)
             )
 
-            Spacer(modifier = Modifier.height(24.dp))
-
-            // Sensor layout visualization
-            SensorLayoutCanvas(
-                channelDetected = channelDetected,
-                directionIcon = directionIcon,
-                isLocked = isLocked
-            )
-
-            Spacer(modifier = Modifier.height(24.dp))
+            Spacer(modifier = Modifier.height(16.dp))
 
             // Direction guide
             if (directionHint.isNotEmpty() && !isLocked) {
@@ -319,16 +310,18 @@ fun PlacementGuideView(appState: AppState) {
                     val urineLens = MutableList(6) { 0 }
                     val allWalls: MutableList<Pair<Int, Int>?> = MutableList(6) { null }
 
+                    val MIN_URINE_LEN_PLACEMENT = 10 // Placement에서는 최소 10칸 이상이어야 유효
+
                     for (ch in channels) {
                         if (ch.buffer.isNotEmpty() && ch.channel < 6) {
                             val analysis = analyzer.analyzeChannel(ch.buffer, ch.channel)
-                            if (analysis.isValid && analysis.result != null) {
+                            if (analysis.isValid && analysis.result != null && analysis.result.urineLen >= MIN_URINE_LEN_PLACEMENT) {
                                 detected[ch.channel] = true
                                 urineLens[ch.channel] = analysis.result.urineLen
                                 allWalls[ch.channel] = Pair(analysis.result.ant, analysis.result.post)
                             } else {
                                 val gate = UrinAI.detect(ch.buffer)
-                                if (gate.detected) {
+                                if (gate.detected && (gate.bw - gate.fw) >= MIN_URINE_LEN_PLACEMENT) {
                                     detected[ch.channel] = true
                                     urineLens[ch.channel] = gate.bw - gate.fw
                                     allWalls[ch.channel] = Pair(gate.fw, gate.bw)