fix: preserve amount when returning to edit screen

Author: ovitrif

app/src/main/java/to/bitkit/ui/nav/entries/SheetEntries.kt

@@ -76,7 +76,6 @@ import to.bitkit.ui.sheets.QuickPayIntroSheet
 import to.bitkit.ui.sheets.UpdateSheet
 import to.bitkit.ui.utils.NotificationUtils
 import to.bitkit.viewmodels.ActivityListViewModel
-import to.bitkit.viewmodels.AmountInputViewModel
 import to.bitkit.viewmodels.AppViewModel
 import to.bitkit.viewmodels.SendEvent
 import to.bitkit.viewmodels.SettingsViewModel
@@ -679,12 +678,7 @@ private fun EntryProviderScope<NavKey>.receiveFlowEntries(
         metadata = SheetSceneStrategy.sheet()
     ) {
         val walletState by walletViewModel.walletState.collectAsStateWithLifecycle()
-        val editInvoiceAmountViewModel = hiltViewModel<AmountInputViewModel>()
-
-        LaunchedEffect(Unit) { editInvoiceAmountViewModel.clearInput() }
-
         EditInvoiceScreen(
-            amountInputViewModel = editInvoiceAmountViewModel,
             walletUiState = walletState,
             onBack = { navigator.popBackTo(Routes.Receive.Qr, inclusive = true) },
             updateInvoice = walletViewModel::updateBip21Invoice,

app/src/main/java/to/bitkit/ui/screens/wallets/receive/EditInvoiceScreen.kt

@@ -70,7 +70,6 @@ import to.bitkit.viewmodels.previewAmountInputViewModel
 @Suppress("ViewModelForwarding")
 @Composable
 fun EditInvoiceScreen(
-    amountInputViewModel: AmountInputViewModel,
     walletUiState: WalletState,
     updateInvoice: (ULong?) -> Unit,
     onClickAddTag: () -> Unit,
@@ -80,12 +79,22 @@ fun EditInvoiceScreen(
     navigateReceiveConfirm: (CjitEntryDetails) -> Unit,
     currencies: CurrencyState = LocalCurrencies.current,
     editInvoiceVM: EditInvoiceVM = hiltViewModel(),
+    amountInputViewModel: AmountInputViewModel = hiltViewModel(),
 ) {
     val blocktankVM = blocktankViewModel ?: return
     var keyboardVisible by remember { mutableStateOf(false) }
     var isSoftKeyboardVisible by keyboardAsState()
     val amountInputUiState by amountInputViewModel.uiState.collectAsStateWithLifecycle()
 
+    LaunchedEffect(Unit) {
+        val amount = walletUiState.bip21AmountSats?.toLong() ?: 0L
+        if (amount > 0) {
+            amountInputViewModel.setSats(amount, currencies)
+        } else {
+            amountInputViewModel.clearInput()
+        }
+    }
+
     LaunchedEffect(Unit) {
         editInvoiceVM.editInvoiceEffect.collect { effect ->
             val receiveSats = amountInputUiState.sats.toULong()