Clean up reactions/replies/thread actions

src/app/components/ReplySummary.svelte

@@ -0,0 +1,19 @@
+<script lang="ts">
+  import {groupBy, uniqBy} from "@welshman/lib"
+  import {REACTION} from "@welshman/util"
+  import {deriveEvents} from "@welshman/store"
+  import {pubkey, repository} from "@welshman/app"
+  import Icon from "@lib/components/Icon.svelte"
+  import {REPLY} from "@app/state"
+
+  export let event
+
+  const replies = deriveEvents(repository, {filters: [{kinds: [REPLY], "#E": [event.id]}]})
+</script>
+
+{#if $replies.length > 0}
+  <div class="flex-inline btn btn-neutral btn-xs gap-1 rounded-full">
+    <Icon icon="reply" />
+    {$replies.length}
+  </div>
+{/if}