fix: show loading on spending tab when node not running

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jvsena42

CHANGELOG.md

@@ -9,5 +9,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 - Fix crash when returning app to foreground on Receive screen
+- Show loading state on Spending tab when node is not running
 
 [Unreleased]: https://github.com/synonymdev/bitkit-android/compare/v2.1.2...HEAD

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

@@ -32,9 +32,9 @@ fun getInvoiceForTab(
         }
 
         ReceiveTab.SPENDING -> {
-            // Lightning only: prefer CJIT > bolt11
+            // Lightning only: prefer CJIT > bolt11, empty when node is not running
             cjitInvoice?.takeIf { it.isNotEmpty() && isNodeRunning }
-                ?: bolt11
+                ?: bolt11.takeIf { isNodeRunning }.orEmpty()
         }
     }
 }

app/src/test/java/to/bitkit/ui/screens/wallets/receive/ReceiveInvoiceUtilsTest.kt

@@ -200,7 +200,7 @@ class ReceiveInvoiceUtilsTest {
     }
 
     @Test
-    fun `getInvoiceForTab SPENDING returns bolt11 when node not running even with CJIT`() {
+    fun `getInvoiceForTab SPENDING returns empty when node not running even with CJIT`() {
         val bip21 = "bitcoin:$testAddress?lightning=$testBolt11"
 
         val result = getInvoiceForTab(
@@ -212,7 +212,23 @@ class ReceiveInvoiceUtilsTest {
             onchainAddress = testAddress
         )
 
-        assertEquals(testBolt11, result)
+        assertEquals("", result)
+    }
+
+    @Test
+    fun `getInvoiceForTab SPENDING returns empty when node not running and no CJIT`() {
+        val bip21 = "bitcoin:$testAddress?lightning=$testBolt11"
+
+        val result = getInvoiceForTab(
+            tab = ReceiveTab.SPENDING,
+            bip21 = bip21,
+            bolt11 = testBolt11,
+            cjitInvoice = null,
+            isNodeRunning = false,
+            onchainAddress = testAddress
+        )
+
+        assertEquals("", result)
     }
 
     @Test