Small fixes/performance improvements

src/app/editor/EditMention.svelte

@@ -0,0 +1,16 @@
+<script lang="ts">
+  import type {NodeViewProps} from "@tiptap/core"
+  import {NodeViewWrapper} from "svelte-tiptap"
+  import {deriveProfileDisplay} from "@welshman/app"
+
+  export let node: NodeViewProps["node"]
+  export let selected: NodeViewProps["selected"]
+
+  const display = deriveProfileDisplay(node.attrs.pubkey)
+</script>
+
+<NodeViewWrapper as="span">
+  <button class="tiptap-object {selected ? 'tiptap-active' : ''}">
+    @{$display}
+  </button>
+</NodeViewWrapper>