fix(lotw): run report fetch on Dispatchers.IO — main-thread blocking caused ANR/crash

fetchReportBody is a synchronous HttpURLConnection call (up to 30s connect +
120s read) but was invoked directly from a Main-dispatcher viewModelScope
coroutine: the whole UI froze for the duration of the request, then Android
killed the app with an ANR dialog. Wrap both fetch methods in
withContext(Dispatchers.IO). Bug present since the endpoint was introduced.

core/data/src/main/java/com/rtbishop/look4sat/core/data/repository/LoTWRepository.kt

@@ -45,20 +45,24 @@ import javax.net.ssl.SSLException
 class LoTWRepository : ILoTWRepository {
 
     override suspend fun fetchConfirmedGrids(callsign: String, password: String): LoTWResult =
+        withContext(Dispatchers.IO) {
+            fetchReportBody(callsign, password).fold(
+                onSuccess = { body -> parseBoth(body)?.let { LoTWResult.Success(it.first, it.second) }
+                    ?: LoTWResult.RateLimited },
+                onFailure = { toResult(it) }
+            )
+        }
+
+    override suspend fun fetchConfirmedGridQsos(
+        callsign: String,
+        password: String
+    ): LoTWResult = withContext(Dispatchers.IO) {
         fetchReportBody(callsign, password).fold(
             onSuccess = { body -> parseBoth(body)?.let { LoTWResult.Success(it.first, it.second) }
                 ?: LoTWResult.RateLimited },
             onFailure = { toResult(it) }
         )
-
-    override suspend fun fetchConfirmedGridQsos(
-        callsign: String,
-        password: String
-    ): LoTWResult = fetchReportBody(callsign, password).fold(
-        onSuccess = { body -> parseBoth(body)?.let { LoTWResult.Success(it.first, it.second) }
-            ?: LoTWResult.RateLimited },
-        onFailure = { toResult(it) }
-    )
+    }
 
     internal fun toResult(e: Throwable): LoTWResult = when (e) {
         is CredentialsException -> LoTWResult.BadCredentials