refactor: extract models and utils from nwc

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

@@ -0,0 +1,48 @@
+package com.bitcointxoko.gudariwallet.ui.nwc
+
+import com.bitcointxoko.gudariwallet.api.NwcNewBudget
+
+// ── Available permissions ────────────────────────────────────────────
+internal data class NwcPermission(
+    val serverKey    : String,   // what we send in the permissions array
+    val displayLabel : String,   // shown in the UI
+    val default      : Boolean   // pre-checked by default
+)
+
+internal val ALL_PERMISSIONS = listOf(
+    NwcPermission("pay",     "Send payments",              default = true),
+    NwcPermission("invoice", "Create invoices",            default = false),
+    NwcPermission("lookup",  "Lookup invoice status",      default = false),
+    NwcPermission("history", "Read transaction history",   default = false),
+    NwcPermission("balance", "Read wallet balance",        default = false),
+    NwcPermission("info",    "Read account info",          default = false)
+)
+
+// ── Budget ────────────────────────────────────────────────────────────
+
+/**
+ * Transient UI state for a single budget row in the "Add connection" sheet.
+ * Converted to [NwcNewBudget] on submit.
+ */
+enum class BudgetRefreshWindow(val label: String, val seconds: Int) {
+    DAILY   ("Daily",   86_400),
+    WEEKLY  ("Weekly",  604_800),
+    MONTHLY ("Monthly", 2_592_000),
+    YEARLY  ("Yearly",  31_536_000),
+    NEVER   ("Never",   0);
+}
+
+data class BudgetDraft(
+    val id            : Int    = 0,          // stable key for LazyColumn / forEach
+    val amountSats    : String = "",         // raw text field value (sats)
+    val refreshWindow : BudgetRefreshWindow = BudgetRefreshWindow.MONTHLY
+) {
+    /** Returns null when the amount field is blank or non-numeric. */
+    fun toNwcNewBudget(): NwcNewBudget? {
+        val sats = amountSats.trim().toLongOrNull()?.takeIf { it > 0 } ?: return null
+        return NwcNewBudget(
+            budget_msats   = sats * 1_000L,
+            refresh_window = refreshWindow.seconds
+        )
+    }
+}

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

@@ -38,58 +38,10 @@ import com.bitcointxoko.gudariwallet.ui.receive.QrDisplayCard
 import com.bitcointxoko.gudariwallet.ui.theme.semanticColors
 import java.text.SimpleDateFormat
 import java.time.Instant
-import java.time.ZoneId
-import java.time.format.DateTimeFormatter
-import java.time.format.FormatStyle
 import java.util.Calendar
 import java.util.Locale
 import androidx.core.net.toUri
 
-// ── Available permissions ─────────────────────────────────────────────────────
-internal data class NwcPermission(
-    val serverKey    : String,   // what we send in the permissions array
-    val displayLabel : String,   // shown in the UI
-    val default      : Boolean   // pre-checked by default
-)
-internal val ALL_PERMISSIONS = listOf(
-    NwcPermission("pay",     "Send payments",              default = true),
-    NwcPermission("invoice", "Create invoices",            default = false),
-    NwcPermission("lookup",  "Lookup invoice status",      default = false),
-    NwcPermission("history", "Read transaction history",   default = false),
-    NwcPermission("balance", "Read wallet balance",        default = false),
-    NwcPermission("info",    "Read account info",          default = false)
-)
-
-// ── Budget ────────────────────────────────────────────────────────────────────
-
-/**
- * Transient UI state for a single budget row in the "Add connection" sheet.
- * Converted to [NwcNewBudget] on submit.
- */
-enum class BudgetRefreshWindow(val label: String, val seconds: Int) {
-    DAILY   ("Daily",   86_400),
-    WEEKLY  ("Weekly",  604_800),
-    MONTHLY ("Monthly", 2_592_000),
-    YEARLY  ("Yearly",  31_536_000),
-    NEVER   ("Never",   0);
-}
-
-data class BudgetDraft(
-    val id            : Int    = 0,          // stable key for LazyColumn / forEach
-    val amountSats    : String = "",          // raw text field value (sats)
-    val refreshWindow : BudgetRefreshWindow = BudgetRefreshWindow.MONTHLY
-) {
-    /** Returns null when the amount field is blank or non-numeric. */
-    fun toNwcNewBudget(): NwcNewBudget? {
-        val sats = amountSats.trim().toLongOrNull()?.takeIf { it > 0 } ?: return null
-        return NwcNewBudget(
-            budget_msats   = sats * 1_000L,
-            refresh_window = refreshWindow.seconds
-        )
-    }
-}
-
-
 // ── Screen ────────────────────────────────────────────────────────────────────
 
 @OptIn(ExperimentalMaterial3Api::class)
@@ -829,12 +781,3 @@ private fun NwcErrorContent(message: String, onRetry: () -> Unit, modifier: Modi
         OutlinedButton(onClick = onRetry) { Text("Retry") }
     }
 }
-
-// ── Helpers ───────────────────────────────────────────────────────────────────
-
-private val dateFormatter: DateTimeFormatter =
-    DateTimeFormatter.ofLocalizedDateTime(FormatStyle.SHORT)
-        .withZone(ZoneId.systemDefault())
-
-fun formatEpoch(epochSeconds: Long): String =
-    runCatching { dateFormatter.format(Instant.ofEpochSecond(epochSeconds)) }.getOrDefault("—")

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

@@ -0,0 +1,18 @@
+package com.bitcointxoko.gudariwallet.ui.nwc
+
+import java.time.Instant
+import java.time.ZoneId
+import java.time.format.DateTimeFormatter
+import java.time.format.FormatStyle
+
+// ── Date / time formatting ────────────────────────────────────────────
+
+internal val dateFormatter: DateTimeFormatter =
+    DateTimeFormatter.ofLocalizedDateTime(FormatStyle.SHORT)
+        .withZone(ZoneId.systemDefault())
+
+/** Formats an epoch-seconds timestamp into a localized human-readable string.
+ *  Returns "—" if the timestamp cannot be formatted. */
+internal fun formatEpoch(epochSeconds: Long): String =
+    runCatching { dateFormatter.format(Instant.ofEpochSecond(epochSeconds)) }
+        .getOrDefault("—")