feat: BLE stability fixes, NIRS streaming improvements, catheter count feature

- Fix BLE API deprecation warnings with API 33+ version checks
- Move isServiceReady to onDescriptorWrite for reliable CCCD setup
- Fix battery polling: immediate query on connect, pause during NIRS streaming
- Add mcj retry mechanism for NIRS streaming reliability
- Add debug logging to BLE, NIRS parsing, and processing pipeline
- Add catheter count feature to Piezo monitoring (persistent count, add dialog, auto-decrement on catheterize)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/src/main/java/com/example/medilightv2android/AppState.kt

@@ -2,6 +2,7 @@ package com.example.medilightv2android
 
 import android.content.Context
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
 import com.example.medilightv2android.ble.BleManager
@@ -22,6 +23,7 @@ class AppState(private val context: Context) {
     var bladderLevel by mutableStateOf(BladderLevel())
     var isDeviceConnected by mutableStateOf(false)
     var piezoSettings by mutableStateOf(PiezoSettings())
+    var catheterCount = mutableIntStateOf(0)
 
     private val storage = UserStorage.getInstance(context)
     private val historyStore = MeasurementHistoryStore.getInstance(context)
@@ -40,6 +42,7 @@ class AppState(private val context: Context) {
             catheterizationThreshold = storage.catheterizationLevel
         )
         piezoSettings = storage.piezoSettings
+        catheterCount.intValue = storage.catheterCount
 
         currentScreen = when {
             !storage.hasCompletedOnboarding -> AppScreen.ONBOARDING
@@ -147,6 +150,11 @@ class AppState(private val context: Context) {
         bladderLevel = newLevel
         storage.bladderLevel = 0
         notificationService.cancelAll()
+
+        if (catheterCount.intValue > 0) {
+            catheterCount.intValue--
+            storage.catheterCount = catheterCount.intValue
+        }
     }
 
     fun showHistory() {
@@ -157,6 +165,11 @@ class AppState(private val context: Context) {
         currentScreen = if (sensorMode == SensorMode.NIRS) AppScreen.VIVAMYO_MONITORING else AppScreen.PIEZO_MONITORING
     }
 
+    fun addCatheterCount(amount: Int = 1) {
+        catheterCount.intValue += amount
+        storage.catheterCount = catheterCount.intValue
+    }
+
     fun updateCatheterizationThreshold(threshold: Int) {
         bladderLevel = bladderLevel.copy(catheterizationThreshold = threshold)
         storage.catheterizationLevel = threshold