feat: show contact name on payment rows

app/src/main/java/com/bitcointxoko/gudariwallet/data/ContactRepository.kt

@@ -137,4 +137,7 @@ class ContactRepository(app: Application) {
     fun observePaymentIdsForContact(contactId: String): Flow<List<String>> =
         dao.observePaymentIdsForContact(contactId)
 
+    fun observeAllPaymentContactNames(): Flow<Map<String, String>> =
+        dao.observePaymentContactNames()
+            .map { list -> list.associate { it.checkingId to it.contactName } }
 }

app/src/main/java/com/bitcointxoko/gudariwallet/data/db/ContactDao.kt

@@ -98,4 +98,14 @@ interface ContactDao {
     ORDER BY createdAt DESC
 """)
     fun observePaymentIdsForContact(contactId: String): Flow<List<String>>
+
+    // Returns all (checkingId, displayName) pairs that have a linked contact,
+    // so HistoryViewModel can build its lookup map in a single reactive query.
+    @Query("""
+    SELECT tcl.checkingId AS checkingId,
+           COALESCE(c.localAlias, c.displayName, c.name) AS contactName
+    FROM tx_contact_links tcl
+    INNER JOIN contacts c ON c.id = tcl.contactId
+""")
+    fun observePaymentContactNames(): Flow<List<PaymentContactName>>
 }

app/src/main/java/com/bitcointxoko/gudariwallet/data/db/PaymentContactName.kt

@@ -0,0 +1,6 @@
+package com.bitcointxoko.gudariwallet.data.db
+
+data class PaymentContactName(
+    val checkingId  : String,
+    val contactName : String
+)

app/src/main/java/com/bitcointxoko/gudariwallet/ui/history/HistoryScreen.kt

@@ -77,6 +77,7 @@ fun HistoryScreen(
     val fiatSatsPerUnit by vm.fiatSatsPerUnit.collectAsState()
     val availableTypes  by vm.availableTypes.collectAsState()
     val listState        = rememberLazyListState()
+    val contactNames by vm.contactNames.collectAsState()
 
     var filterSheetVisible     by rememberSaveable { mutableStateOf(false) }
     val dismissFilterSheet      = { filterSheetVisible = false }
@@ -234,6 +235,7 @@ fun HistoryScreen(
                                             payment         = payment,
                                             fiatCurrency    = fiatCurrency,
                                             fiatSatsPerUnit = fiatSatsPerUnit,
+                                            contactName     = contactNames[payment.checkingId],
                                             onClick         = { onPaymentClick(payment) }
                                         )
                                         HorizontalDivider(

app/src/main/java/com/bitcointxoko/gudariwallet/ui/history/HistoryViewModel.kt

@@ -156,7 +156,16 @@ class HistoryViewModel(
                 else list.filter { it.extra?.tag in f.types }
             }
 
-
+    // ── Contact name map ─────────────────────────────────────────────────────
+    // Maps checkingId → display name for any payment that has a linked contact.
+    // Rebuilt whenever the underlying tx_contact_links or contacts tables change.
+    val contactNames: StateFlow<Map<String, String>> =
+        contactRepo.observeAllPaymentContactNames()
+            .stateIn(
+                scope = viewModelScope,
+                started = SharingStarted.WhileSubscribed(5_000),
+                initialValue = emptyMap()
+            )
 
     // ── Contact assignment ───────────────────────────────────────────────────
 

app/src/main/java/com/bitcointxoko/gudariwallet/ui/history/PaymentRow.kt

@@ -36,6 +36,7 @@ internal fun PaymentRow(
     payment         : PaymentRecord,
     fiatCurrency    : String?,
     fiatSatsPerUnit : Double?,
+    contactName     : String? = null,
     onClick         : () -> Unit
 ) {
     val strings     = LocalAppStrings.current
@@ -70,8 +71,9 @@ internal fun PaymentRow(
 
         Column(modifier = Modifier.weight(1f)) {
             Text(
-                text     = payment.memo?.takeIf { it.isNotBlank() }
+                text = contactName                              // ← contact name first
-                    ?: strings.history.paymentRowNoMemo,                    // ← "No memo"
+                    ?: payment.memo?.takeIf { it.isNotBlank() }
+                    ?: strings.history.paymentRowNoMemo,
                 style    = MaterialTheme.typography.bodyMedium,
                 maxLines = 1,
                 overflow = TextOverflow.Ellipsis