Simplify client app component re-render keying

packages/client/src/components/Component.svelte

@@ -65,6 +65,7 @@
   $: inSelectedPath = $builderStore.selectedComponentPath?.includes(id)
   $: evaluateConditions(enrichedSettings?._conditions)
   $: componentSettings = { ...enrichedSettings, ...conditionalSettings }
+  $: renderKey = `${propsHash}-${emptyState}`
 
   // Update component context
   $: componentStore.set({
@@ -176,8 +177,7 @@
   $: droppable = interactive && !isLayout && !isScreen
 </script>
 
-{#key propsHash}
-  {#key empty}
+{#key renderKey}
   {#if constructor && componentSettings && (visible || inSelectedPath)}
     <!-- The ID is used as a class because getElementsByClassName is O(1) -->
     <!-- and the performance matters for the selection indicators -->
@@ -202,7 +202,6 @@
     </div>
   {/if}
 {/key}
-{/key}
 
 <style>
   .component {