WIP: Fix the spend URL derp

app/src/main/java/swiss/qpq/gajumobile/MainActivity.kt

@@ -847,6 +847,7 @@ fun GajuRouter(
 
             QRReceiveScreen(
                 account = activeAccount,
+                networkId = activeWallet.networkId,
                 balanceFormat = GajuFormat.Type.valueOf(appState.balanceFormat),
                 balanceUnit = GajuFormat.Unit.valueOf(appState.balanceUnit),
                 onDone = { navigateBack() },

app/src/main/java/swiss/qpq/gajumobile/ui/screens/QRReceiveScreen.kt

@@ -57,6 +57,7 @@ import java.net.URLEncoder
 @Composable
 fun QRReceiveScreen(
     account: swiss.qpq.gajumobile.data.models.Account,
+    networkId: String,
     balanceFormat: GajuFormat.Type,
     balanceUnit: GajuFormat.Unit,
     onDone: () -> Unit,
@@ -80,14 +81,24 @@ fun QRReceiveScreen(
         GajuFormat.amount(GajuFormat.standardSpec(balanceFormat, balanceUnit), amountPucks)
     }
 
-    val generatedUrl = remember(amountPucks, payload, account.gajuId) {
+    val generatedUrl = remember(amountPucks, payload, account.gajuId, networkId) {
         try {
-            val baseUrl = "grids://gaju/1/s/${account.gajuId}?a=$amountPucks"
+            val baseUrl = "grids://$networkId/1/s/${account.gajuId}"
+            val queryParams = mutableListOf<String>()
+            
+            if (amountPucks > BigInteger.ZERO) {
+                queryParams.add("a=$amountPucks")
+            }
+            
             if (payload.isNotBlank()) {
                 val p = URLEncoder.encode(payload, "UTF-8")
-                "$baseUrl&p=$p"
-            } else {
+                queryParams.add("p=$p")
+            }
+            
+            if (queryParams.isEmpty()) {
                 baseUrl
+            } else {
+                baseUrl + "?" + queryParams.joinToString("&")
             }
         } catch (_: Exception) {
             ""