fix expandable not visible in preview (#7032)

frontend/src/lib/components/flows/map/FlowModuleSchemaItem.svelte

@@ -506,25 +506,11 @@
 						<Move size={12} />
 					</button>
 				{/if}
-				{#if maximizeSubflow !== undefined && (hover || selected)}
-					<button
-						title="Expand subflow"
-						class={twMerge(
-							'center-center text-secondary shadow-sm bg-surface duration-0 hover:bg-surface-accent-hover hover:text-white p-1',
-							selected || hover ? 'block' : '!hidden',
-							'group-hover:block',
-							'shadow-md rounded-md'
-						)}
-						onclick={(e) => {
-							e.stopPropagation()
-							e.preventDefault()
 
-							maximizeSubflow?.()
-						}}
-					>
-						<Maximize2 size={12} />
-					</button>
+				{#if maximizeSubflow !== undefined && (hover || selected)}
+					{@render buttonMaximizeSubflow?.()}
 				{/if}
+
 				<button
 					class={twMerge(
 						'trash center-center text-secondary shadow-sm bg-surface duration-0 hover:bg-red-400 hover:text-white p-1',
@@ -570,6 +556,12 @@
 					<TriangleAlert size={12} strokeWidth={2} />
 				</Popover>
 			{/if}
+		{:else if maximizeSubflow !== undefined}
+			<div
+				class="absolute -translate-y-[100%] top-2 right-10 flex flex-row gap-1 p-1 min-w-[52px] h-7 justify-end"
+			>
+				{@render buttonMaximizeSubflow?.()}
+			</div>
 		{/if}
 	</div>
 
@@ -631,6 +623,25 @@
 	{/if}
 </div>
 
+{#snippet buttonMaximizeSubflow()}
+	<button
+		title="Expand subflow"
+		class={twMerge(
+			'center-center text-secondary shadow-sm bg-surface duration-0 hover:bg-surface-accent-hover hover:text-white p-1',
+			selected || hover ? 'block' : '!hidden',
+			'group-hover:block',
+			'shadow-md rounded-md'
+		)}
+		onclick={(e) => {
+			e.stopPropagation()
+			e.preventDefault()
+			maximizeSubflow?.()
+		}}
+	>
+		<Maximize2 size={12} />
+	</button>
+{/snippet}
+
 <style>
 	.module:hover .trash {
 		display: flex !important;