fix: saturate total-with-hardware balance sum

Author: ovitrif

app/src/main/java/to/bitkit/models/BalanceState.kt

@@ -17,5 +17,5 @@ data class BalanceState(
 ) {
     val totalSats get() = totalOnchainSats + totalLightningSats
 
-    val totalWithHardwareSats get() = totalSats + totalHardwareSats
+    val totalWithHardwareSats get() = totalSats.safe() + totalHardwareSats.safe()
 }

app/src/test/java/to/bitkit/models/BalanceStateTest.kt

@@ -26,4 +26,10 @@ class BalanceStateTest {
         val state = BalanceState(totalOnchainSats = 100uL, totalLightningSats = 50uL)
         assertEquals(state.totalSats, state.totalWithHardwareSats)
     }
+
+    @Test
+    fun `totalWithHardwareSats saturates instead of overflowing`() {
+        val state = BalanceState(totalLightningSats = ULong.MAX_VALUE, totalHardwareSats = 10uL)
+        assertEquals(ULong.MAX_VALUE, state.totalWithHardwareSats)
+    }
 }