fix(dm): make the commons DM feed UI compile for iOS

The DM history widgets extracted into commons were never compiled for the
commons iOS target, which hid two Kotlin/Native-only breaks:

- RelayReachMarker: `toSortedMap(compareBy { it.ordinal })` + a destructured
  `(state, list)` Map.Entry inside an inline @Composable lambda don't type-infer
  on Native. Rewrite as `.entries.sortedBy { it.key.ordinal }` with explicit
  `entry.key` / `entry.value`.
- DmHistoryLoadingCard referenced RelayPagingProgress, which sat in quartz's
  jvmAndroid source set — visible to commonMain only when building JVM/Android,
  not iOS. It's a pure data class, so move it to quartz commonMain.

commons:compileKotlinIosArm64 now succeeds; JVM/Android unaffected and the DM
test suite is still green (26/26).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/ui/feeds/RelayReachMarker.kt

@@ -212,11 +212,17 @@ private fun RelayReachMarker(entries: List<RelayReach>) {
             fontWeight = FontWeight.Medium,
             maxLines = 1,
         )
+        // Present states in enum order. Written with an explicit `sortedBy` + `entry.key`/`entry.value`
+        // (not `toSortedMap(compareBy { it.ordinal })` + a destructured `(state, list)`) because
+        // Kotlin/Native's Compose compiler can't infer those inside this inline @Composable lambda
+        // (commons iOS).
         entries
             .groupBy { it.state }
-            .toSortedMap(compareBy { it.ordinal })
             .entries
-            .forEachIndexed { index, (state, list) ->
+            .sortedBy { it.key.ordinal }
+            .forEachIndexed { index, entry ->
+                val state = entry.key
+                val list = entry.value
                 if (index > 0) {
                     Text("·", color = MaterialTheme.colorScheme.onSurfaceVariant, fontSize = 11.sp)
                 }