refactor: Use UInt in regtestMine

Author: ovitrif

app/src/main/java/to/bitkit/ui/settings/BlocktankRegtestScreen.kt

@@ -155,7 +155,7 @@ fun BlocktankRegtestScreen(
                             isMining = true
                             try {
                                 val count =
-                                    mineBlockCount.toIntOrNull() ?: error("Invalid block count: $mineBlockCount")
+                                    mineBlockCount.toUIntOrNull() ?: error("Invalid block count: $mineBlockCount")
                                 viewModel.regtestMine(count)
                                 Logger.debug("Successfully mined $count blocks")
                                 app.toast(

app/src/main/java/to/bitkit/ui/settings/BlocktankRegtestViewModel.kt

@@ -12,8 +12,8 @@ class BlocktankRegtestViewModel @Inject constructor(
      * Mines a number of blocks on the regtest network.
      * @param count Number of blocks to mine. Default is 1.
      */
-    suspend fun regtestMine(count: Int = 1) {
-        uniffi.bitkitcore.regtestMine(count = count.toUInt())
+    suspend fun regtestMine(count: UInt = 1u) {
+        uniffi.bitkitcore.regtestMine(count = count)
     }
 
     /**