Currency parsing and formating

# Conflicts:
#	app/src/main/java/net/helcel/cowspent/android/main/BillsListComponents.kt

app/src/main/java/net/helcel/cowspent/android/bill_edit/EditBillActivity.kt

@@ -187,7 +187,12 @@ class EditBillActivity : AppCompatActivity() {
                 }
             }
             calendar.timeInMillis = bill.timestamp * 1000
-            val members = db.getMembersOfProject(bill.projectId, null)
+            val allMembers = db.getMembersOfProject(bill.projectId, null)
+            val billOwerIds = bill.billOwersIds
+            val members = allMembers.filter { m ->
+                m.isActivated || m.id == bill.payerId || billOwerIds.contains(m.id)
+            }
+            
             val project = db.getProject(bill.projectId)
             val currencies = db.getCurrencies(bill.projectId)
             withContext(Dispatchers.Main) {

app/src/main/java/net/helcel/cowspent/android/bill_edit/EditBillScreen.kt

@@ -188,7 +188,9 @@ fun BillBasicInfoSection(
         placeholder = { Text("0") },
         modifier = Modifier.fillMaxWidth(),
         leadingIcon = {
-            val currencyToShow = viewModel.selectedCurrencyName.ifEmpty { viewModel.mainCurrencyName }
+            val currencyToShow = viewModel.selectedCurrencyName.ifEmpty { 
+                viewModel.mainCurrencyName.ifEmpty { "$" } 
+            }
             TextIconDisplay(
                 textIcon = TextIcon.Symbol(currencyToShow),
                 tint = MaterialTheme.colors.onSurface.copy(alpha = 0.6f)
@@ -198,7 +200,7 @@ fun BillBasicInfoSection(
             IconButton(
                 enabled = canEdit,
                 onClick = {
-                    val mainLabel = viewModel.mainCurrencyName.ifEmpty { "Main" }
+                    val mainLabel = viewModel.mainCurrencyName.ifEmpty { "$" }
                     val options = listOf("$mainLabel | Base") + viewModel.currencies.map { 
                         "${it.name} | 1 $mainLabel = ${it.exchangeRate} ${it.name}" 
                     }

app/src/main/java/net/helcel/cowspent/android/bill_edit/EditBillViewModel.kt

@@ -10,6 +10,7 @@ import androidx.lifecycle.ViewModel
 import net.helcel.cowspent.model.DBBill
 import net.helcel.cowspent.model.DBMember
 import net.helcel.cowspent.android.helper.DialogState
+import net.helcel.cowspent.android.helper.parseAmount
 import net.helcel.cowspent.util.SupportUtil
 import net.helcel.cowspent.util.evalMath
 
@@ -41,13 +42,8 @@ class EditBillViewModel : ViewModel() {
 
     val amountAsDouble: Double
         get() {
-            val amountStr = amount.replace(',', '.')
-            return try {
-                if (amountStr.matches("[0-9.]+".toRegex())) {
-                    amountStr.toDouble()
-                } else {
-                    evalMath(amountStr)
-                }
+            return parseAmount(amount) ?: try {
+                evalMath(amount.replace(',', '.'))
             } catch (_: Exception) {
                 0.0
             }

app/src/main/java/net/helcel/cowspent/android/currencies/ManageCurrenciesScreen.kt

@@ -18,6 +18,7 @@ import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import net.helcel.cowspent.R
 import net.helcel.cowspent.android.helper.AlertDialog
+import net.helcel.cowspent.android.helper.formatAmount
 import net.helcel.cowspent.model.DBCurrency
 
 @Composable
@@ -108,7 +109,7 @@ fun ManageCurrenciesScreen(
                     horizontalArrangement = Arrangement.Center
                 ) {
                     Text("1 ", style = MaterialTheme.typography.body1)
-                    Text(viewModel.mainCurrencyName.ifEmpty { "Base" }, fontWeight = FontWeight.Bold)
+                    Text(viewModel.mainCurrencyName.ifEmpty { "$" }, fontWeight = FontWeight.Bold)
                     Text(" = ", style = MaterialTheme.typography.h6)
                     Text(viewModel.newCurrencyRate.ifEmpty { "0.0" }, fontWeight = FontWeight.Bold, color = MaterialTheme.colors.primary)
                     Text(" ")
@@ -170,7 +171,7 @@ fun CurrencyRow(currency: DBCurrency, mainCurrencyName: String, onDelete: () ->
                 color = MaterialTheme.colors.onSurface.copy(alpha = 0.6f)
             )
             Text(
-                text = mainCurrencyName,
+                text = mainCurrencyName.ifEmpty { "$" },
                 style = MaterialTheme.typography.body1,
                 fontWeight = FontWeight.Bold
             )
@@ -182,7 +183,7 @@ fun CurrencyRow(currency: DBCurrency, mainCurrencyName: String, onDelete: () ->
             )
             Column {
                 Text(
-                    text = currency.exchangeRate.toString(),
+                    text = formatAmount(currency.exchangeRate),
                     style = MaterialTheme.typography.body1,
                     fontWeight = FontWeight.ExtraBold
                 )

app/src/main/java/net/helcel/cowspent/android/helper/FormatUtils.kt

@@ -1,20 +1,80 @@
 package net.helcel.cowspent.android.helper
 
-import net.helcel.cowspent.util.SupportUtil
+import java.text.NumberFormat
 import java.util.Locale
 import kotlin.math.abs
 import kotlin.math.round
 
+/**
+ * Formats amount using k/M notation (e.g., 1.5k for 1500).
+ */
 fun formatShortValue(value: Double): String {
+    val absValue = abs(value)
+    val sign = if (value < 0) "-" else ""
     return when {
-        value >= 1_000_000 -> String.format(Locale.ROOT, "%.1fM", value / 1_000_000).replace(".0", "")
-        value >= 1_000 -> String.format(Locale.ROOT, "%.1fk", value / 1_000).replace(".0", "")
-        else -> String.format(Locale.ROOT, "%.0f", value)
+        absValue >= 1_000_000 -> sign + formatAmount(absValue / 1_000_000) + "M"
+        absValue >= 1_000 -> sign + formatAmount(absValue / 1_000) + "k"
+        else -> sign + formatAmount(absValue)
     }
 }
 
+/**
+ * Formats balance with sign and locale-aware number formatting.
+ */
 fun formatBalance(balance: Double): String {
     val rbalance = round(abs(balance) * 100.0) / 100.0
     val balanceSign = if (balance > 0.01) "+" else if (balance < -0.01) "-" else ""
-    return if (rbalance == 0.0) "" else "$balanceSign${SupportUtil.normalNumberFormat.format(rbalance)}"
+    return if (rbalance == 0.0) "" else "$balanceSign${formatAmount(rbalance)}"
+}
+
+/**
+ * Formats amount using system locale or specified locale.
+ */
+fun formatAmount(value: Double, locale: Locale = Locale.getDefault()): String {
+    val formatter = NumberFormat.getNumberInstance(locale)
+    formatter.maximumFractionDigits = 2
+    formatter.minimumFractionDigits = 0
+    return formatter.format(value)
+}
+
+/**
+ * Parses amount from string robustly.
+ * Tries common separators and cleans up non-numeric characters (except separators).
+ */
+fun parseAmount(input: String?): Double? {
+    if (input.isNullOrBlank()) return null
+    
+    // Remove non-numeric characters except for delimiters and minus sign
+    val cleaned = input.replace(Regex("[^0-9,.-]"), "").trim()
+    
+    if (cleaned.isEmpty()) return null
+
+    // If there's both a comma and a dot, we assume the last one is the decimal separator
+    val lastDot = cleaned.lastIndexOf('.')
+    val lastComma = cleaned.lastIndexOf(',')
+    
+    return if (lastDot != -1 && lastComma != -1) {
+        if (lastDot > lastComma) {
+            // Dot is decimal, comma is thousands
+            cleaned.replace(",", "").toDoubleOrNull()
+        } else {
+            // Comma is decimal, dot is thousands
+            cleaned.replace(".", "").replace(",", ".").toDoubleOrNull()
+        }
+    } else if (lastComma != -1) {
+        // Only comma. Could be decimal or thousands. 
+        if (cleaned.count { it == ',' } == 1) {
+            cleaned.replace(',', '.').toDoubleOrNull()
+        } else {
+            // Multiple commas -> thousands
+            cleaned.replace(",", "").toDoubleOrNull()
+        }
+    } else {
+        // Only dots or no separators
+        if (cleaned.count { it == '.' } > 1) {
+            cleaned.replace(".", "").toDoubleOrNull()
+        } else {
+            cleaned.toDoubleOrNull()
+        }
+    }
 }

app/src/main/java/net/helcel/cowspent/android/main/BillsListComponents.kt

@@ -16,6 +16,7 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import net.helcel.cowspent.R
+import net.helcel.cowspent.android.helper.formatAmount
 import net.helcel.cowspent.android.helper.MemberAvatar
 import net.helcel.cowspent.model.DBBill
 import net.helcel.cowspent.model.DBMember