refactor: BrightnessController and QrDisplayCard to ui/common

app/src/main/java/com/bitcointxoko/gudariwallet/ui/common/BrightnessController.kt

@@ -15,9 +15,10 @@ fun rememberBrightnessController(): BrightnessController {
     val window = (LocalContext.current as? Activity)?.window
     var isOn by remember { mutableStateOf(false) }
 
-    LaunchedEffect(isOn) {
+    // Sync side-effect: no coroutine needed
+    SideEffect {
         window?.attributes = window?.attributes?.apply {
-            screenBrightness = if (isOn) 1f
+            screenBrightness = if (isOn) WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_FULL
             else      WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_NONE
         }
     }
@@ -30,9 +31,9 @@ fun rememberBrightnessController(): BrightnessController {
         }
     }
 
-    return remember(isOn) {
-        BrightnessController(isOn = isOn, toggle = { isOn = !isOn })
-    }
+    // No remember needed — BrightnessController is a tiny data class,
+    // and this composable already recomposes only when isOn changes.
+    return BrightnessController(isOn = isOn, toggle = { isOn = !isOn })
 }
 
 data class BrightnessController(

app/src/main/java/com/bitcointxoko/gudariwallet/ui/common/QrDisplayCard.kt

@@ -1,4 +1,4 @@
-package com.bitcointxoko.gudariwallet.ui.receive
+package com.bitcointxoko.gudariwallet.ui.common
 
 import android.content.ClipData
 import android.graphics.Bitmap

app/src/main/java/com/bitcointxoko/gudariwallet/ui/nwc/NwcPairingDialog.kt

@@ -1,10 +1,7 @@
 package com.bitcointxoko.gudariwallet.ui.nwc
 
-import android.app.Activity
 import android.content.ActivityNotFoundException
 import android.content.Intent
-import android.view.WindowManager
-import android.widget.Toast
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxWidth
@@ -13,18 +10,12 @@ import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextButton
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.DisposableEffect
-import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.unit.dp
 import androidx.core.net.toUri
 import com.bitcointxoko.gudariwallet.ui.common.rememberBrightnessController
-import com.bitcointxoko.gudariwallet.ui.receive.QrDisplayCard
+import com.bitcointxoko.gudariwallet.ui.common.QrDisplayCard
 
 @Composable
 internal fun NwcPairingUrlDialog(

app/src/main/java/com/bitcointxoko/gudariwallet/ui/receive/ReceiveScreen.kt

@@ -1,7 +1,5 @@
 package com.bitcointxoko.gudariwallet.ui.receive
 
-import android.app.Activity
-import android.view.WindowManager
 import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
@@ -58,14 +56,13 @@ import androidx.compose.ui.unit.dp
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.bitcointxoko.gudariwallet.LocalAppStrings
 import com.bitcointxoko.gudariwallet.ui.ReceiveState
-import com.bitcointxoko.gudariwallet.ui.SendState
 import com.bitcointxoko.gudariwallet.ui.WalletViewModel
+import com.bitcointxoko.gudariwallet.ui.common.QrDisplayCard
+import com.bitcointxoko.gudariwallet.ui.common.rememberBrightnessController
 import com.bitcointxoko.gudariwallet.ui.components.UnitWheelPicker
 import com.bitcointxoko.gudariwallet.ui.nfc.NfcViewModel
 import com.bitcointxoko.gudariwallet.util.buildUpTaps
-import com.bitcointxoko.gudariwallet.util.doubleTap
 import com.bitcointxoko.gudariwallet.util.fiatLabel
-import com.bitcointxoko.gudariwallet.util.heavyClick
 import kotlinx.coroutines.delay
 
 @Composable
@@ -75,31 +72,16 @@ fun ReceiveScreen(
     onNavigateToPaymentDetail: (checkingId: String) -> Unit
 ) {
     val strings          = LocalAppStrings.current
+    val context          = LocalContext.current
+    val brightness       = rememberBrightnessController()
+    var showAddress      by remember { mutableStateOf(false) }
     val receiveState     by vm.receiveState.collectAsStateWithLifecycle()
     val lightningAddress by vm.lightningAddress.collectAsStateWithLifecycle()
     val fiatRate         by vm.fiatSatsPerUnit.collectAsStateWithLifecycle()
     val fiatCurrency     by vm.selectedCurrency.collectAsStateWithLifecycle()
 
-    val context            = LocalContext.current
-    val window             = (context as Activity).window
-    val originalBrightness = remember { window.attributes.screenBrightness }
-    var brightnessOn       by remember { mutableStateOf(false) }
-    var showAddress        by remember { mutableStateOf(false) }
-
-    val onToggleBrightness = {
-        val lp = window.attributes
-        lp.screenBrightness = if (!brightnessOn)
-            WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_FULL
-        else originalBrightness
-        window.attributes = lp
-        brightnessOn = !brightnessOn
-    }
-
     DisposableEffect(Unit) {
         onDispose {
-            val lp = window.attributes
-            lp.screenBrightness = originalBrightness
-            window.attributes = lp
             nfcVm.stopEmulating()
             vm.resetReceiveState()
         }
@@ -141,8 +123,8 @@ fun ReceiveScreen(
                             lightningAddress   = lightningAddress,
                             showAddress        = showAddress,
                             onToggleAddress    = { showAddress = !showAddress },
-                            brightnessOn       = brightnessOn,
-                            onToggleBrightness = onToggleBrightness,
+                            brightnessOn       = brightness.isOn,
+                            onToggleBrightness = brightness.toggle,
                             isLoading          = receiveState is ReceiveState.AwaitingInvoice,
                             onCreateInvoice    = { amountSats, memo ->
                                 vm.createInvoice(
@@ -216,8 +198,8 @@ fun ReceiveScreen(
                 state              = receiveState as ReceiveState.InvoiceReady,
                 fiatRate           = fiatRate,
                 fiatCurrency       = fiatCurrency,
-                brightnessOn       = brightnessOn,
-                onToggleBrightness = onToggleBrightness,
+                brightnessOn       = brightness.isOn,
+                onToggleBrightness = brightness.toggle,
                 nfcVm              = nfcVm,
                 onReset            = { vm.resetReceiveState() }
             )
@@ -512,7 +494,7 @@ private fun AmountStepContent(
         val number = amountText.trim().toDoubleOrNull() ?: return@remember null
         when (activeUnit) {
             AmountUnit.SATS -> fiatLabel(number.toLong(), fiatRate, fiatCurrency)
-            AmountUnit.FIAT -> "≈ ${(number * fiatRate!!).toLong()} sats"
+            AmountUnit.FIAT -> "≈ ${(number * fiatRate).toLong()} sats"
         }
     }
 
@@ -560,7 +542,7 @@ private fun AmountStepContent(
             )
 
             UnitWheelPicker(
-                units           = if (showFiatToggle) listOf(strings.sats, fiatCurrency!!) else listOf(strings.sats),
+                units           = if (showFiatToggle) listOf(strings.sats, fiatCurrency) else listOf(strings.sats),
                 selectedIndex   = if (activeUnit == AmountUnit.SATS) 0 else 1,
                 onIndexSelected = { newIndex ->
                     val newUnit = if (newIndex == 0) AmountUnit.SATS else AmountUnit.FIAT